{"title":"Antlia Astronomy Filters","description":"\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eAntlia Filters provides premium \u003c\/span\u003e\u003cspan\u003eH-alpha, SII, and OIII narrowband imaging filters with ultra narrowband a FWHM bandpass of 2.5nm, 2.8nm \u0026amp; 3nm to more standard bandpass filters of 4.5nm \u0026amp; 7nm. LRGB-V filters,\u003c\/span\u003e\u003cspan\u003e dual-band filters, H-beta-OIII visual filters and more are also available\u003c\/span\u003e\u003cspan\u003e for deep-sky photography enthusiasts all around the world.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"antlia-2-5nm-h-alpha-ultra-series-filter-2","title":"Antlia 3nm H-Alpha Pro Series Filter - 1.25\" - HA-PRO-3NM-125","description":"\u003cp\u003eThis very narrowband 3 nm H-alpha filter from Antlia is part of their Ultra series and comes in a 1.25\" threaded filter cell that is designed to be screwed on to the 1.25\" receptacle of your astrophotography accessory, including a 1.25\" filter wheel.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eImportant! Not for use when viewing or imaging the Sun!\u003c\/em\u003e  \u003c\/p\u003e\n\u003cp\u003eImage shows the 2\" version of this H-Alpha filter.\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series H-Alpha Filter - 1.25\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis Antlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm\u003c\/span\u003e\u003cspan\u003e bandpass\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003cspan\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eare\u003c\/span\u003e\u003cspan\u003e designed to deliver 88\u003c\/span\u003e\u003cspan\u003e% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;88% within 1nm range of the center bandwidth,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan\u003eB\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved \u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003eharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth \u003c\/span\u003e\u003cspan\u003eto maximize \u003c\/span\u003e\u003cspan\u003econtrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003edark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3\u003c\/span\u003e\u003cspan\u003e systems\u003c\/span\u003e\u003cspan\u003e with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll A\u003c\/span\u003e\u003cspan\u003entlia\u003c\/span\u003e\u003cspan\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003cspan\u003e emissions.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Schott optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness:   \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm for 1.25\u003c\/span\u003e\u003cspan\u003e'' \u003c\/span\u003e\u003cspan\u003emounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFilter Cell:\u003c\/strong\u003e  M28.5*0.6mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: \u003c\/span\u003e\u003cspan\u003e656.3nm\u003c\/span\u003e\u003cspan\u003enm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞88%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001%\u003c\/span\u003e\u003cspan\u003e out of band blocking\u003c\/span\u003e\u003cspan\u003e) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674574168177,"sku":"ATL-HA-PRO-3NM-125","price":362.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/HA-PRO-3NM-2.jpg?v=1776459310"},{"product_id":"antlia-2-5nm-sii-ultra-series-filter-2","title":"Antlia 2.5nm SII Ultra Series Filter - 2\" -SII-ULTRA-2.5NM-2","description":"\u003cp\u003eThis very narrowband 2.5 nm SII filter from Antlia is part of their Ultra series and comes in a 2\" threaded filter cell that is designed to be screwed on to the 2\" barrel of your astrophotography accessory, including a 2\" filter wheel or filter drawer.  \u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 2.5nm Ultra Series Sulfur II Filter - 2\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia 2.5nm Ultra Series Filters are made with quartz glass and undergo precisely controlled coating processes to ensure optimal performance. The \u003c\/span\u003e\u003cspan\u003e2.5nm \u003c\/span\u003e\u003cspan\u003eUltra series is designed with a FWHM (full width half maximum) of 2.5nm +0.3\/-0.1nm and a transmission efficiency \u0026gt;92-95% at the Central Wavelength\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe quartz glass possesses\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ean ultra-low thermal expansion coefficient\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ewith outstanding thermal and mechanical properties.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eWhen combined with advanced coating processes, these filters exhibit remarkable durability for imaging and research in the most challenging environmental conditions.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCompared to the 3nm Pro series, the 2.5nm Ultra series, coated on quartz glass, exhibits higher transmittance with Ha\/SII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e95% and OIII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e92%. These filters are estimated to improve signal by 20-30% in your images. Additionally, the\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eUltra series boasts a narrower FWHM of 2.5nm+0.3\/-0.1nm,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eresulting in an exceptionally high Signal to Noise Ratio\u003c\/span\u003e\u003cspan\u003e for deep sky photography.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eHighlights \u0026amp; Application \u003c\/h3\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eHigh transmittance （Ha\/SII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e9\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e%，OIII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e92\u003c\/span\u003e\u003cspan\u003e%）and the narrow FWHM\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e2.\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003enm +0.\u003c\/span\u003e\u003cspan\u003e3\u003c\/span\u003e\u003cspan\u003e\/-0.1\u003c\/span\u003e\u003cspan\u003enm\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eto maximize contrast\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eFlat-top spectrum minimizes the loss in transmission due to the Center Wavelength (CWL)-shift\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- O\u003c\/span\u003e\u003cspan\u003eut of band blocking specification is designed\u003c\/span\u003e\u003cspan\u003e to\u003c\/span\u003e\u003cspan\u003e OD5 (0.001%)\u003c\/span\u003e\u003cspan\u003e to\u003c\/span\u003e\u003cspan\u003e block interference from other wavelengths and minimize halos around bright stars\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eMade of quartz glass, excellent durability and thermal stability\u003c\/span\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cspan\u003ebetter fracture resistance and scratch resistance, improved coating resilience to cleaning;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- Filters are resistant to scratches；\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eIdentical filter thickness to existing standards and double-sided fine polishing , with utmost care for parfocality\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- The SHO 2.5\u003c\/span\u003e\u003cspan\u003enm Ultra filters are recommended for use in optics with a Focus Ratio of ≥ f\/3.5 for best optical performance;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003e100% of production are scanned individually, all transmission and blocking (OD) data in the box are actual, measured spectra and transmission\u003c\/span\u003e\u003cspan\u003e；\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eAll Antlia filters are coated to the edge of the substrate and unmounted narrowband filters are edge blackened to eliminate internal reflections from stray ligh\u003c\/span\u003e\u003cspan\u003et\u003c\/span\u003e\u003cspan\u003e；\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eWarranty: \u003c\/span\u003e\u003cspan\u003e3\u003c\/span\u003e\u003cspan\u003e-years against delamination\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSII Filter Tech Specs:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFWHM:  2.5nm +0.3\/-0.2nm\u003c\/p\u003e\n\u003cp\u003eCWL (Central Wavelength): 672.4nm\u003c\/p\u003e\n\u003cp\u003ePeak Transmission:  95%\u003c\/p\u003e\n\u003cp\u003eBlocking:  +\/-OD5\u003c\/p\u003e\n\u003cp\u003eFilter Thickness:  2 mm +\/- 0.05mm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Ring:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia standard ring: \u003c\/span\u003e\u003cspan\u003e2\u003c\/span\u003e\u003cspan\u003e’’\u003c\/span\u003e\u003cspan\u003e(M48*0.75)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUltra-thin filter cell to minimize vignetting while maximizing clear aperture \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBlack Anodized Finish\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLaser Engraving No Fading\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674575347825,"sku":"ATL-SII-ULTRA-2.5NM-2","price":838.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/SII-ULTRA-2.5NM-2.jpg?v=1776459218"},{"product_id":"antlia-2-5nm-oiii-ultra-series-filter-2","title":"Antlia 2.5nm OIII Ultra Series Filter - 2\" - OIII-ULTRA-2.5NM-2","description":"\u003cp\u003eThis very narrowband 2.5 nm OIII filter from Antlia is part of their Ultra series and comes in a 2\" threaded filter cell that is designed to be screwed on to the 2\" receptacle of your astrophotography accessory, including a 2\" filter wheel or filter drawer.  \u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 2.5nm Ultra Series OIII Filter - 2\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia 2.5nm Ultra Series Filters are made with quartz glass and undergo precisely controlled coating processes to ensure optimal performance. The \u003c\/span\u003e\u003cspan\u003e2.5nm \u003c\/span\u003e\u003cspan\u003eUltra series is designed with a FWHM (full width half maximum) of 2.5nm +0.3\/-0.1nm and a transmission efficiency \u0026gt;92-95% at the Central Wavelength\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe quartz glass possesses\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ean ultra-low thermal expansion coefficient\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ewith outstanding thermal and mechanical properties.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eWhen combined with advanced coating processes, these filters exhibit remarkable durability for imaging and research in the most challenging environmental conditions.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCompared to the 3nm Pro series, the 2.5nm Ultra series, coated on quartz glass, exhibits higher transmittance with Ha\/SII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e95% and OIII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e92%. These filters are estimated to improve signal by 20-30% in your images. Additionally, the\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eUltra series boasts a narrower FWHM of 2.5nm+0.3\/-0.1nm,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eresulting in an exceptionally high Signal to Noise Ratio\u003c\/span\u003e\u003cspan\u003e for deep sky photography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eImportant:  Do not use when viewing or imaging the Sun!\u003c\/p\u003e\n\u003ch3\u003eHighlights \u0026amp; Application \u003c\/h3\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eHigh transmittance （Ha\/SII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e9\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e%，OIII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e92\u003c\/span\u003e\u003cspan\u003e%）and the narrow FWHM\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e2.\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003enm +0.\u003c\/span\u003e\u003cspan\u003e3\u003c\/span\u003e\u003cspan\u003e\/-0.1\u003c\/span\u003e\u003cspan\u003enm\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eto maximize contrast\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eFlat-top spectrum minimizes the loss in transmission due to the Center Wavelength (CWL)-shift\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- O\u003c\/span\u003e\u003cspan\u003eut of band blocking specification is designed\u003c\/span\u003e\u003cspan\u003e to\u003c\/span\u003e\u003cspan\u003e OD5 (0.001%)\u003c\/span\u003e\u003cspan\u003e to\u003c\/span\u003e\u003cspan\u003e block interference from other wavelengths and minimize halos around bright stars\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eMade of quartz glass, excellent durability and thermal stability\u003c\/span\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cspan\u003ebetter fracture resistance and scratch resistance, improved coating resilience to cleaning;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- Filters are resistant to scratches；\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eIdentical filter thickness to existing standards and double-sided fine polishing , with utmost care for parfocality\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- The SHO 2.5\u003c\/span\u003e\u003cspan\u003enm Ultra filters are recommended for use in optics with a Focus Ratio of ≥ f\/3.5 for best optical performance;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003e100% of production are scanned individually, all transmission and blocking (OD) data in the box are actual, measured spectra and transmission\u003c\/span\u003e\u003cspan\u003e；\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eAll Antlia filters are coated to the edge of the substrate and unmounted narrowband filters are edge blackened to eliminate internal reflections from stray ligh\u003c\/span\u003e\u003cspan\u003et\u003c\/span\u003e\u003cspan\u003e；\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eWarranty: \u003c\/span\u003e\u003cspan\u003e3\u003c\/span\u003e\u003cspan\u003e-years against de-lamination\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOxygen III Filter Tech Specs:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFWHM:  2.5nm +0.3\/-0.2nm\u003c\/p\u003e\n\u003cp\u003eCWL (Central Wavelength): 500.7nm\u003c\/p\u003e\n\u003cp\u003ePeak Transmission:  92%\u003c\/p\u003e\n\u003cp\u003eBlocking:  +\/-OD5\u003c\/p\u003e\n\u003cp\u003eFilter Thickness:  2 mm +\/- 0.05mm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Ring:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia standard ring: \u003c\/span\u003e\u003cspan\u003e2\u003c\/span\u003e\u003cspan\u003e’’\u003c\/span\u003e\u003cspan\u003e(M48*0.75)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUltra-thin filter cell to minimize vignetting while maximizing clear aperture \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBlack Anodized Finish\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLaser Engraving No Fading\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674582556785,"sku":"ATL-OIII-ULTRA-2.5NM-2","price":838.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/OIII-ULTRA-2.5NM-2.jpg?v=1776459300"},{"product_id":"antlia-3nm-h-alpha-pro-series-filter-2","title":"Antlia 3nm H-Alpha Pro Series Filter - 2\" - HA-PRO-3NM-2","description":"\u003cp\u003eThis very narrowband 3 nm H-alpha filter from Antlia is part of their Pro series and comes in a 2\" threaded filter cell that is designed to be screwed on to the 2\" receptacle of your astrophotography accessory, including a 2\" filter wheel or filter holder.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eImportant! Not for use when viewing or imaging the Sun!  \u003c\/em\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series H-Alpha Filter - 2\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis Antlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm\u003c\/span\u003e\u003cspan\u003e bandpass\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003cspan\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eare\u003c\/span\u003e\u003cspan\u003e designed to deliver 88\u003c\/span\u003e\u003cspan\u003e% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;88% within 1nm range of the center bandwidth,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan\u003eB\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved \u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003eharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth \u003c\/span\u003e\u003cspan\u003eto maximize \u003c\/span\u003e\u003cspan\u003econtrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003edark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3\u003c\/span\u003e\u003cspan\u003e systems\u003c\/span\u003e\u003cspan\u003e with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll A\u003c\/span\u003e\u003cspan\u003entlia\u003c\/span\u003e\u003cspan\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003cspan\u003e emissions.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Schott optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness:   \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm for \u003c\/span\u003e\u003cspan\u003e2'' \u003c\/span\u003e\u003cspan\u003emounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFilter Cell:\u003c\/strong\u003e  M48*0.75mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: \u003c\/span\u003e\u003cspan\u003e656.3nm\u003c\/span\u003e\u003cspan\u003enm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞88%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001%\u003c\/span\u003e\u003cspan\u003e out of band blocking\u003c\/span\u003e\u003cspan\u003e) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674616668273,"sku":"ATL-HA-PRO-3NM-2","price":561.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/HA-PRO-3NM-2_5e6e8ce9-f8f7-414b-bb92-e271bfd61a89.jpg?v=1776458954"},{"product_id":"antlia-3nm-sii-pro-series-filter-2","title":"Antlia 3nm SII Pro Series Filter - 2\" - SII-PRO-3NM-2","description":"\u003cp\u003eThis very narrowband 3 nm SII filter from Antlia is part of their Pro series and comes in a 2\" threaded filter cell that is designed to be screwed on to the 2\" receptacle of your astrophotography accessory, including a 2\" filter wheel or filter drawer.  \u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series Sulfur II Filter - 2\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis Antlia \u003c\/span\u003e\u003cspan\u003eSII \u003c\/span\u003e\u003cspan\u003ePro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm bandpass. As the bandwidth becomes narrower, the \u003c\/span\u003e\u003cspan\u003e3nm \u003c\/span\u003e\u003cspan\u003ePro \u003c\/span\u003e\u003cspan\u003enarrowband \u003c\/span\u003e\u003cspan\u003efilters enhance contrast of emission targets by lowering the unwanted background signal. Antlia SII\u003c\/span\u003e\u003cspan\u003e 3nm Pro\u003c\/span\u003e\u003cspan\u003e filter is designed to deliver 88% transmission at the 671.6nm line\u003c\/span\u003e\u003cspan\u003e which\u003c\/span\u003e\u003cspan\u003e provides you with the maximum signal and well defined nebulae structures\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong (Center Wavelength (CWL)-shift\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eWe guarantee T\u0026gt;88% within 1nm range of the center bandwidth\u003c\/span\u003e\u003cspan\u003e,\u003c\/span\u003e\u003cspan\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems\u003c\/span\u003e\u003cspan\u003e. B\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eshift data show that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved\u003c\/span\u003e\u003cspan\u003e sharp cut-off\u003c\/span\u003e\u003cspan\u003e astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003cspan\u003e to maximize\u003c\/span\u003e\u003cspan\u003e contrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3 with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces post image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan\u003eSII\u003c\/span\u003e\u003cspan\u003e emissions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Schott optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness：\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm for \u003c\/span\u003e\u003cspan\u003e2'' \u003c\/span\u003e\u003cspan\u003emounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFilter Cell:\u003c\/strong\u003e  M48*0.75mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 671.6nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞88%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674634592369,"sku":"ATL-SII-PRO-3NM-2","price":561.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/SII-PRO-3NM-2.jpg?v=1776459175"},{"product_id":"antlia-3nm-sii-pro-series-filter-1-25","title":"Antlia 3nm SII Pro Series Filter - 1.25\" - SII-PRO-3NM-125","description":"\u003cp\u003eThis very narrowband 3 nm SII filter from Antlia is part of their Pro series and comes in a 1.25\" threaded filter cell that is designed to be screwed on to the 1.25\" receptacle of your astrophotography accessory, including a 1.25\" filter wheel.\u003c\/p\u003e\n\u003cp\u003ePhoto shows the 2\" version of this filter.\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series Sulfur II Filter - 1.25\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis Antlia \u003c\/span\u003e\u003cspan\u003eSII \u003c\/span\u003e\u003cspan\u003ePro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm bandpass. As the bandwidth becomes narrower, the \u003c\/span\u003e\u003cspan\u003e3nm \u003c\/span\u003e\u003cspan\u003ePro \u003c\/span\u003e\u003cspan\u003enarrowband \u003c\/span\u003e\u003cspan\u003efilters enhance contrast of emission targets by lowering the unwanted background signal. Antlia SII\u003c\/span\u003e\u003cspan\u003e 3nm Pro\u003c\/span\u003e\u003cspan\u003e filter is designed to deliver 88% transmission at the 671.6nm line\u003c\/span\u003e\u003cspan\u003e which\u003c\/span\u003e\u003cspan\u003e provides you with the maximum signal and well defined nebulae structures\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong (Center Wavelength (CWL)-shift\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eWe guarantee T\u0026gt;88% within 1nm range of the center bandwidth\u003c\/span\u003e\u003cspan\u003e,\u003c\/span\u003e\u003cspan\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems\u003c\/span\u003e\u003cspan\u003e. B\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eshift data show that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved\u003c\/span\u003e\u003cspan\u003e sharp cut-off\u003c\/span\u003e\u003cspan\u003e astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003cspan\u003e to maximize\u003c\/span\u003e\u003cspan\u003e contrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3 with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces post image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan\u003eSII\u003c\/span\u003e\u003cspan\u003e emissions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Schott optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness：\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm for 1.25\u003c\/span\u003e\u003cspan\u003e'' \u003c\/span\u003e\u003cspan\u003emounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFilter Cell:\u003c\/strong\u003e  M28.5*0.6mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 671.6nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞88%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674639933553,"sku":"ATL-SII-PRO-3NM-125","price":362.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/SII-PRO-3NM-2_1bc9f662-e03a-46ca-b53f-fdd7de6ac969.jpg?v=1776458959"},{"product_id":"antlia-2-5nm-oiii-pro-series-filter-2","title":"Antlia 3nm OIII Pro Series Filter - 2\" - OIII-PRO-3NM-2","description":"\u003cp\u003eThis very narrowband 3 nm OIII filter from Antlia is part of their Pro series and comes in a 2\" threaded filter cell that is designed to be screwed on to the 2\" receptacle of your astrophotography accessory, including a 2\" filter wheel or filter drawer.  \u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series Oxygen III Filter - 2\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm \u003c\/span\u003e\u003cspan\u003e\u003cins datetime=\"2021-01-06T13:06\" cite=\"mailto:Ted%20Dobosz\"\u003e\u003c\/ins\u003e\u003c\/span\u003e\u003cspan\u003ebandpass\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan\u003eOIII\u003c\/span\u003e\u003cspan\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eare\u003c\/span\u003e\u003cspan\u003e designed to deliver \u003c\/span\u003e\u003cspan\u003e85\u003c\/span\u003e\u003cspan\u003e% transmission at the 500.7nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eshift\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003cspan\u003e We guarantee T\u0026gt;\u003c\/span\u003e\u003cspan\u003e85\u003c\/span\u003e\u003cspan\u003e% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan\u003eB\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eloss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eoff rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved sharp cut\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eoff astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003cspan\u003e to maximize\u003c\/span\u003e\u003cspan\u003e contrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3\u003c\/span\u003e\u003cspan\u003e systems\u003c\/span\u003e\u003cspan\u003e with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll A\u003c\/span\u003e\u003cspan\u003entlia\u003c\/span\u003e\u003cspan\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain OIII emissions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness:   \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm for 2'' \u003c\/span\u003e\u003cspan\u003emounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFilter Cell:\u003c\/strong\u003e  M48*0.75mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 500.7nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞85%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674646192241,"sku":"ATL-OIII-PRO-3NM-2","price":561.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/OIII-PRO-3NM-2.jpg?v=1776459222"},{"product_id":"antlia-3nm-oiii-pro-series-filter-1-25","title":"Antlia 3nm OIII Pro Series Filter - 1.25\" - OIII-PRO-3NM-125","description":"\u003cp\u003eThis very narrowband 3 nm OIII filter from Antlia is part of their Ultra series and comes in a 1.25\" threaded filter cell that is designed to be screwed on to the 1.25\" receptacle of your astrophotography accessory, including a 1.25\" filter wheel.  \u003c\/p\u003e\n\u003cp\u003eThe photo shows the 2\" version of this OIII 3nm 1.25\" filter.\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series Oxygen III Filter - 1.25\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm \u003c\/span\u003e\u003cspan\u003e\u003cins cite=\"mailto:Ted%20Dobosz\" datetime=\"2021-01-06T13:06\"\u003e\u003c\/ins\u003e\u003c\/span\u003e\u003cspan\u003ebandpass\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan\u003eOIII\u003c\/span\u003e\u003cspan\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eare\u003c\/span\u003e\u003cspan\u003e designed to deliver \u003c\/span\u003e\u003cspan\u003e85\u003c\/span\u003e\u003cspan\u003e% transmission at the 500.7nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eshift\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003cspan\u003e We guarantee T\u0026gt;\u003c\/span\u003e\u003cspan\u003e85\u003c\/span\u003e\u003cspan\u003e% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan\u003eB\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eloss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eoff rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved sharp cut\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eoff astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003cspan\u003e to maximize\u003c\/span\u003e\u003cspan\u003e contrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3\u003c\/span\u003e\u003cspan\u003e systems\u003c\/span\u003e\u003cspan\u003e with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll A\u003c\/span\u003e\u003cspan\u003entlia\u003c\/span\u003e\u003cspan\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain OIII emissions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness:   \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm for 1.25'' \u003c\/span\u003e\u003cspan\u003emounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFilter Cell:\u003c\/strong\u003e  M28.5*0.6mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 500.7nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞85%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674647896177,"sku":"ATL-OIII-PRO-3NM-125","price":362.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/OIII-PRO-3NM-2_cd038576-709a-47cf-8732-2c5f958d2677.jpg?v=1776458983"},{"product_id":"antlia-4-5nm-h-alpha-edge-series-filter-1-25-ha-edge-4-5nm-125","title":"Antlia 4.5nm H-Alpha Edge Series Filter - 1.25\" - HA-EDGE-4.5NM-125","description":"\u003cp\u003eThis narrowband 4.5 nm H-alpha filter from Antlia is part of their Edge series and comes in a 1.25\" threaded filter cell that is designed to be screwed on to the 1.25\" receptacle of your astrophotography accessory, including a 1.25\" filter wheel.\u003c\/p\u003e\n\u003cp\u003eImportant! Not for use when viewing or imaging the Sun! \u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 4.5nm Edge Series H-Alpha Filter - 1.25\" Mounted\u003c\/h3\u003e\n\u003cp\u003eAntlia H-alpha Edge narrowband filters optimize the FWHM (full width half maximum) to a 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\n\u003cp\u003eThe Antlia H-alpha 4.5nm EGDE filter is designed to deliver high transmittance at the 656.3nm line that provides you with the maximum signal to reveal the faintest H-alpha nebulae structures.\u003c\/p\u003e\n\u003cp\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the H-alpha 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\n\u003cp\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\n\u003cp\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\n\u003cp\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\n\u003cp\u003eUse in both light polluted areas and dark sites\u003c\/p\u003e\n\u003cp\u003eExtends imaging time when the moon is up\u003c\/p\u003e\n\u003cp\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\n\u003cp\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\n\u003cp\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\n\u003cp\u003eThis filter is only effective for deep sky objects that contain H-alpha emissions\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003eFilter Thickness: 2mm+\/-0.05mm for 1.25”\u003c\/p\u003e\n\u003cp\u003eFilter Cell:  M28.5*0.6\u003c\/p\u003e\n\u003cp\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\n\u003cp\u003eCWL (Central Wavelength): 656.3nm\u003c\/p\u003e\n\u003cp\u003ePeak Transmission:＞90% Blocking: \u0026gt; 5 OD (out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003eTransmitted Wavefront: Lambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003eParallelism: less than 30 arcsec\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674710188145,"sku":"ATL-HA-EDGE-4.5NM-125","price":263.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/HA-EDGE-4.5NM-125.jpg?v=1776459233"},{"product_id":"antlia-4-5nm-h-alpha-edge-series-filter-2-ha-edge-4-5nm-2","title":"Antlia 4.5nm H-Alpha Edge Series Filter - 2\" - HA-EDGE-4.5NM-2","description":"\u003cp\u003eThis narrowband 4.5nm H-alpha filter from Antlia is part of their Edge series and comes in a 2\" threaded filter cell that is designed to be screwed on to the 2\" receptacle of your astrophotography accessory, including a 2\" filter wheel or filter holder.\u003c\/p\u003e\n\u003cp\u003eImportant! Not for use when viewing or imaging the Sun! \u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 4.5nm Edge Series H-Alpha Filter - 2\" Mounted\u003c\/h3\u003e\n\u003cp\u003eAntlia H-alpha Edge narrowband filters optimize the FWHM (full width half maximum) to a 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\n\u003cp\u003eThe Antlia H-alpha 4.5nm EGDE filter is designed to deliver high transmittance at the 656.3nm line that provides you with the maximum signal to reveal the faintest H-alpha nebulae structures.\u003c\/p\u003e\n\u003cp\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the H-alpha 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\n\u003cp\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\n\u003cp\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\n\u003cp\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\n\u003cp\u003eUse in both light polluted areas and dark sites\u003c\/p\u003e\n\u003cp\u003eExtends imaging time when the moon is up\u003c\/p\u003e\n\u003cp\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\n\u003cp\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\n\u003cp\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\n\u003cp\u003eThis filter is only effective for deep sky objects that contain H-alpha emissions\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003eFilter Thickness: 2mm+\/-0.05mm for 2”\u003c\/p\u003e\n\u003cp\u003eFilter Cell:  M48*0.75\u003c\/p\u003e\n\u003cp\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\n\u003cp\u003eCWL (Central Wavelength): 656.3nm\u003c\/p\u003e\n\u003cp\u003ePeak Transmission:＞90% Blocking: \u0026gt; 5 OD (out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003eTransmitted Wavefront: Lambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003eParallelism: less than 30 arcsec\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674712580209,"sku":"ATL-HA-EDGE-4.5NM-2","price":412.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/HA-EDGE-4.5NM-2.jpg?v=1776459310"},{"product_id":"antila-alp-t-dualband-3nm-ha-oiii-filter-2-alpt-db-3nm-haoiii-2","title":"Antlia ALP-T Dualband 3nm HA \u0026 OIII Filter - 2\" - ALPT-DB-3NM-HAOIII-2","description":"\u003cp\u003eThis ALP-T, or Anti-Light Pollution Filter, allows a 3nm narrowband transmission from both the OIII and H-Alpha bands!  This model comes in a 2\" threaded filter cell, which allows it to be connected to the 2\" threaded accessory of your choice, including a 2\" filter wheel or filter holder. For f\/4 or slower telescopes.\u003c\/p\u003e\n\u003cp\u003eImportant!  Do not use this filter for solar viewing or imaging!\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia ALP-T Dualband 3nm H-Alpha \u0026amp; OIII Filter - 2\"\u003c\/h3\u003e\n\u003cp\u003eThis dual narrowband filter lets the red H-alpha (656.3nm) and the blue-green OIII (500.7nm) lines through, and is primarily engineered for color cameras when great SNR is desired when taking deep sky images. With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the Ha and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures and Application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses OIII 500.7nm and H-alpha 656.3nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the red and blue-green at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eRecommended to be used with ALP-T Dual Band SII\/Hb filter to create images with better SNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength): Hydrogen-alpha: 656.3nm, Oxygen III: 500.7nm\u003c\/li\u003e\n\u003cli\u003ePeak Transmission: Hydrogen-alpha: 90%, Oxygen III: 82%\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674720641137,"sku":"ATL-ALPT-DB-3NM-HAOIII-2","price":554.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/ALPT-DB-3NM-HA-OIII-2.jpg?v=1776459253"},{"product_id":"antlia-quad-anti-light-pollution-filter-2-quad-anti-lp-2","title":"Antlia Quad Anti-Light Pollution Filter - 2\" - QUAD-ANTI-LP-2","description":"\u003ch3 style=\"text-align: center;\"\u003eAntlia Quad Anti Light Pollution Filter - 2\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/Antila_QUAD_LP_Filter_Specs.png?v=1740087537\" style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe Antlia Quad Band Anti-Light Pollution Filter is a light suppression filter for color and monochrome cameras. It is able to shoot most deep sky objects like galaxies, reflection nebulae, emission nebula, and star clusters from a Bortle 1-8 location as its spectral transmission passes through the visible light region, near-ultraviolet (NUV) and near-infrared (NIR) region.\u003c\/p\u003e\n\u003cp\u003eThe Antlia Quad Band filter has a broad bandpass designed to cope with faster optics up to the f\/2 focal ratio.\u003c\/p\u003e\n\u003cp\u003eConsidering the high quantum efficiency (QE) characteristics of the latest cameras in the near-infrared region and this region is less susceptible to artificial light pollution, the Antlia Quad Band Light-Pollution Filter adds high transmission in the near-infrared (NIR) band. This spectrum design improves image signal-to-noise ratio and contrast by capturing signals in visible bands and NIR region, while also maintaining ood color balance and being easier to manage in post-processing. \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eCertain full-spectrum objects like M51, M83 possess significant signal in the near-infrared (NIR) region, you can possibly capture these deep sky objects more contrasted with the Antlia Quad Band filter under light polluted condition.\u003c\/p\u003e\n\u003cp\u003eWhen using this filter with a camera that has UV\/IR cut protective glass, the visible band transmission signal is retained, but the IR cut limits your ability to capture targets with infrared signal.\u003c\/p\u003e\n\u003cp\u003eTherefore, the Antlia Quad Band filter is more suitable for cameras with AR protective glass as they can capture both NIR and visible band signals.\u003c\/p\u003e\n\u003ch3\u003eHighlights and Application\u003c\/h3\u003e\n\u003cp\u003e- Anti-Light Pollution\u003c\/p\u003e\n\u003cp\u003eThe Antlia Quad Band filter is an effective solution for reducing light pollution, as it cuts out most of the orange-yellow lights from 589nm and part of blue lights from LEDs\u003c\/p\u003e\n\u003cp\u003e- Possible to shoot over 95% of deep sky objects\u003c\/p\u003e\n\u003cp\u003e- Unique spectral design offers more possibilities for astrophotography\u003c\/p\u003e\n\u003cp\u003e- High transmittance of the main emission lines Ha\/SII\/OIII\/H-Beta in the visible region, enhances the astrophotography's high SNR and contrast;\u003c\/p\u003e\n\u003cp\u003e- Near-infrared (NIR) region transmittance\u003c\/p\u003e\n\u003cp\u003e- Passing near infrared region is for shooting deep sky objects that cannot be shot with other filters without NIR transmission\u003c\/p\u003e\n\u003cp\u003e- The broad bandpass designed to cope with faster optics up to the f\/2 focal ratio.\u003c\/p\u003e\n\u003cp\u003e- Good color balance\u003c\/p\u003e\n\u003cp\u003e- It is easier to achieve color balance by adding the short-wavelength transmission\u003c\/p\u003e\n\u003cp\u003e- Superior optical reliability reduces post image processing\u003c\/p\u003e\n\u003cp\u003e- Basic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003e- Surface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003e- Transmitted Wavefront: Lambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003e- Parallelism: less than 30 arcsec\u003c\/p\u003e\n\u003cp\u003e- Warranty: 3-years against delamination\u003c\/p\u003e\n\u003ch3\u003eFilter Specifications\u003c\/h3\u003e\n\u003cp\u003eH-Alpha Wavelength:  656.3nm\u003c\/p\u003e\n\u003cp\u003eSII Wavelength:  671.6nm \u0026amp; 672.4nm\u003c\/p\u003e\n\u003cp\u003eOIII Wavelength:  495.9nm \u0026amp; 500.7nm\u003c\/p\u003e\n\u003cp\u003eH-Beta Wavelength:  486.1nm\u003c\/p\u003e\n\u003cp\u003eNII Wavelength:  658.3nm \u0026amp; 654.8nm\u003c\/p\u003e\n\u003cp\u003ePeak Transmission for All Wavelengths:  \u0026lt;92%\u003c\/p\u003e\n\u003cp\u003eBlocking:  +\/-OD4 @ 300-1050nm\u003c\/p\u003e\n\u003cp\u003eFilter Thickness:  2 mm +\/- 0.05mm\u003c\/p\u003e\n\u003cp\u003eFilter Ring:  2\" - M48*0.75, black anodized, laser engraved\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674721263729,"sku":"ATL-QUAD-ANTI-LP-2","price":281.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/QUAD-ANTI-LP-2.jpg?v=1776459255"},{"product_id":"antlia-2-5nm-h-alpha-ultra-series-filter-2-ha-ultra-2-5nm-2","title":"Antlia 2.5nm H-Alpha Ultra Series Filter - 2\" - HA-ULTRA-2.5NM-2","description":"\u003cp style=\"text-align: left;\"\u003eThis very narrowband 2.5 nm H-Alpha filter from Antlia is part of their Ultra series and comes in a 2\" threaded filter cell that is designed to be screwed on to the 2\" receptacle of your astrophotography accessory, including a 2\" filter wheel or filter drawer.  \u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 2.5nm Ultra Series H-Alpha Filter - 2\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia 2.5nm Ultra Series Filters are made with quartz glass and undergo precisely controlled coating processes to ensure optimal performance. The \u003c\/span\u003e\u003cspan\u003e2.5nm \u003c\/span\u003e\u003cspan\u003eUltra series is designed with a FWHM (full width half maximum) of 2.5nm +0.3\/-0.1nm and a transmission efficiency \u0026gt;92-95% at the Central Wavelength\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe quartz glass possesses\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ean ultra-low thermal expansion coefficient\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ewith outstanding thermal and mechanical properties.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eWhen combined with advanced coating processes, these filters exhibit remarkable durability for imaging and research in the most challenging environmental conditions.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCompared to the 3nm Pro series, the 2.5nm Ultra series, coated on quartz glass, exhibits higher transmittance with Ha\/SII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e95% and OIII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e92%. These filters are estimated to improve signal by 20-30% in your images. Additionally, the\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eUltra series boasts a narrower FWHM of 2.5nm+0.3\/-0.1nm,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eresulting in an exceptionally high Signal to Noise Ratio\u003c\/span\u003e\u003cspan\u003e for deep sky photography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eImportant:  Do not use when viewing or imaging the Sun!\u003c\/p\u003e\n\u003ch3\u003eHighlights \u0026amp; Application \u003c\/h3\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eHigh transmittance （Ha\/SII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e9\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e%，OIII\u003c\/span\u003e\u003cspan\u003e≥\u003c\/span\u003e\u003cspan\u003e92\u003c\/span\u003e\u003cspan\u003e%）and the narrow FWHM\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e2.\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003enm +0.\u003c\/span\u003e\u003cspan\u003e3\u003c\/span\u003e\u003cspan\u003e\/-0.1\u003c\/span\u003e\u003cspan\u003enm\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eto maximize contrast\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eFlat-top spectrum minimizes the loss in transmission due to the Center Wavelength (CWL)-shift\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- O\u003c\/span\u003e\u003cspan\u003eut of band blocking specification is designed\u003c\/span\u003e\u003cspan\u003e to\u003c\/span\u003e\u003cspan\u003e OD5 (0.001%)\u003c\/span\u003e\u003cspan\u003e to\u003c\/span\u003e\u003cspan\u003e block interference from other wavelengths and minimize halos around bright stars\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eMade of quartz glass, excellent durability and thermal stability\u003c\/span\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cspan\u003ebetter fracture resistance and scratch resistance, improved coating resilience to cleaning;\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- Filters are resistant to scratches；\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eIdentical filter thickness to existing standards and double-sided fine polishing , with utmost care for parfocality\u003c\/span\u003e\u003cspan\u003e;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- The SHO 2.5\u003c\/span\u003e\u003cspan\u003enm Ultra filters are recommended for use in optics with a Focus Ratio of ≥ f\/3.5 for best optical performance;\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003e100% of production are scanned individually, all transmission and blocking (OD) data in the box are actual, measured spectra and transmission\u003c\/span\u003e\u003cspan\u003e；\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e- \u003c\/span\u003e\u003cspan\u003eAll Antlia filters are coated to the edge of the substrate and unmounted narrowband filters are edge blackened to eliminate internal reflections from stray ligh\u003c\/span\u003e\u003cspan\u003et\u003c\/span\u003e\u003cspan\u003e；\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eWarranty: \u003c\/span\u003e\u003cspan\u003e3\u003c\/span\u003e\u003cspan\u003e-years against delamination\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHydrogen-Alpha Filter Tech Specs:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFWHM:  2.5nm +0.3\/-0.2nm\u003c\/p\u003e\n\u003cp\u003eCWL (Central Wavelength): 656.3nm\u003c\/p\u003e\n\u003cp\u003ePeak Transmission:  95%\u003c\/p\u003e\n\u003cp\u003eBlocking:  +\/-OD5\u003c\/p\u003e\n\u003cp\u003eFilter Thickness:  2 mm +\/- 0.05mm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Ring:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia standard ring: \u003c\/span\u003e\u003cspan\u003e2\u003c\/span\u003e\u003cspan\u003e’’\u003c\/span\u003e\u003cspan\u003e(M48*0.75)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUltra-thin filter cell to minimize vignetting while maximizing clear aperture \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBlack Anodized Finish\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLaser Engraving No Fading\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674785849457,"sku":"ATL-HA-ULTRA-1.5NM-2","price":838.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/HA-ULTRA-2.5NM-2_d0d17f7e-4ba9-483c-b941-84b32489cfc1.jpg?v=1776458921"},{"product_id":"antlia-tri-band-ultra-ii-rgb-filter-2-rgb-trib-ultra-ii-2","title":"Antlia Tri-Band Ultra II RGB Filter - 2\" - RGB-TRIB-ULTRA-II-2","description":"\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eAntlia Tri-Band Ultra II RGB Filter - 2\" Mounted\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia Tri-Band Ultra II RGB Filter is designed for light pollution suppression for OSC and Mono cameras. The spectral \u003c\/span\u003e\u003cspan\u003edesign selected the most substantial information in the RGB bands, which makes Antlia Triband RGB Ultra Filter possible to shoot over 90% of deep sky objects, in addition to its excellent performance on \u003cem\u003eemission nebula\u003c\/em\u003e, different from other ultra-narrowband filters, it is able to capture \u003cem\u003egalaxies, reflection nebulae, and star clusters\u003c\/em\u003e from a Bortle 8 location to Bortle 1 while presenting more balanced RGB colors in your images. Also, it has a broad \u003c\/span\u003e\u003cspan\u003ebandpass designed to cope with faster optics up to the f\/2 focal ratio.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe quantum efficiency of the B channel in current CMOS sensors is often significantly lower than that of R and G channels. \u003c\/span\u003e\u003cspan\u003eThe Antlia team was to produce a filter with a more realistic color balance for astrophotography from light polluted locations. \u003c\/span\u003e\u003cspan\u003eThe problem with the low blue wavelength efficiency becomes apparent when imaging reflection nebulae and blue stars. In \u003c\/span\u003e\u003cspan\u003eCMOS sensors, the blue wavelengths also contain contribution from the stronger green spectrum, thereby affecting the balance \u003c\/span\u003e\u003cspan\u003eof the blue colours. Many popular imaging objects contain reflection nebula with faint blue hues such the central part of \u003c\/span\u003e\u003cspan\u003eNGC2264. Therefore, Antlia designed Triband RGB Ultra Filter that not only retains the HSO emission signal but also \u003c\/span\u003e\u003cspan\u003eincreases the amount of luminous flux of the blue B channel. By improving the blue wavelength transmission, the color of the \u003c\/span\u003e\u003cspan\u003ephoto is better balanced and easier to manage in post processing. \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eYou can use the Antlia Tri-Band RGB Filter to image galaxies, reflection nebulae and star clusters. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt's refined coating process produces a filter that has excellent halo suppression and improved \u003c\/span\u003e\u003cspan\u003esignal-to-noise performance. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Tri-Band Ultra Filter has been specifically designed for balanced color transmission using Antlia's experience in spectrum design. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe balanced transmission allows the minimal color cast to broadband emission objects such as stars, galaxies, and\u003c\/span\u003e\u003cspan\u003eglobular clusters. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Triband RGB Ultra can be used with nearly all systems as fast as f\/2 with minimal loss of efficiency or shifts in \u003c\/span\u003e\u003cspan\u003espectral response. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhen shooting LRGB with mono cameras, unless you are wanting to image LDN (dark nebulae) the Triband RGB Ultra \u003c\/span\u003e\u003cspan\u003ecan be used as a luminance filter replacement for objects such as nebulae and galaxies to improve contrast and signal to \u003c\/span\u003e\u003cspan\u003enoise ratio. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Triband RGB Ultra is able to better isolate the H-alpha, OIII and blue spectrum from the background light pollution. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor visual use, Triband RGB Ultra filter ensures the high transmittance of the HSO emission line and can be used for \u003c\/span\u003e\u003cspan\u003eobserving deep-sky objects with large-diameter telescopes. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe filter provides excellent flexibility and compatibility with both OSC and Mono camera systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt facilitates the imaging of most astronomical objects using all optical configurations down to f\/2 focal ratio. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/Tri-Band_Specs.jpg?v=1740424903\" style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674798891121,"sku":"ATL-RGB-TRIB-ULTRA-II-2","price":254.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/RGB-TRIB-ULTRA-II-2.jpg?v=1776459150"},{"product_id":"antlia-lrgb-v-pro-filter-set-1-25-lrgb-v-pro-125","title":"Antlia LRGB V Pro Filter Set - 1.25\" - LRGB-V-PRO-125","description":"\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eAntlia LRGB-V Pro Filter Set - 1.25\" Mounted\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia LRGB-V Pro series filters are designed for monochrome cameras that use both CCD and CMOS sensors. \u003c\/span\u003e\u003cspan\u003eSuitable \u003c\/span\u003e\u003cspan\u003esensors \u003c\/span\u003e\u003cspan\u003einclude KAF\/KAI sensors, Sony IMX sensors, GSENSE and other sensor manufacturers. The \u003c\/span\u003e\u003cspan\u003eLRGB-V \u003c\/span\u003e\u003cspan\u003ePro set \u003c\/span\u003e\u003cspan\u003eis designed \u003c\/span\u003e\u003cspan\u003eto approximately equalize the RGB response \u003c\/span\u003e\u003cspan\u003efrom \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003eflux of red-sensitive \u003c\/span\u003e\u003cspan\u003eCCD \u003c\/span\u003e\u003cspan\u003edetectors. The result is that \u003c\/span\u003e\u003cspan\u003eyou achieve 1:1:1 equalized RGB \u003c\/span\u003e\u003cspan\u003eexposures \u003c\/span\u003e\u003cspan\u003ewith \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003ebenefit of \u003c\/span\u003e\u003cspan\u003esimplified \u003c\/span\u003e\u003cspan\u003epost \u003c\/span\u003e\u003cspan\u003eprocessing and reduced imaging time. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe LRGB-V Pro series filters feature a \u003c\/span\u003e\u003cspan\u003ecarefully designed spectral \u003c\/span\u003e\u003cspan\u003egap between \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003egreen and red \u003c\/span\u003e\u003cspan\u003echannels to \u003c\/span\u003e\u003cspan\u003eminimize the effect of light pollution and \u003c\/span\u003e\u003cspan\u003eto provide high transmittance of useful \u003c\/span\u003e\u003cspan\u003efrequencies. \u003c\/span\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003efilters’ design \u003c\/span\u003e\u003cspan\u003emaximizes the capture of details from fainter galaxies and nebulae emissions. \u003c\/span\u003e\u003cspan\u003eThe LRGB-V Pro series \u003c\/span\u003e\u003cspan\u003efilters guarantee the high transmission \u003c\/span\u003e\u003cspan\u003eof \u003c\/span\u003e\u003cspan\u003ethe OIII band in \u003c\/span\u003e\u003cspan\u003eboth the B \u003c\/span\u003e\u003cspan\u003eand \u003c\/span\u003e\u003cspan\u003eG filters \u003c\/span\u003e\u003cspan\u003e(OIII \u003c\/span\u003e\u003cspan\u003esignal \u0026gt;95% in blue and \u003c\/span\u003e\u003cspan\u003egreen). The bandwidth of the B channel \u003c\/span\u003e\u003cspan\u003eis \u003c\/span\u003e\u003cspan\u003enarrowed for the \u003c\/span\u003e\u003cspan\u003epurpose of improving the \u003c\/span\u003e\u003cspan\u003eblue \u003c\/span\u003e\u003cspan\u003echannel overflow (haloing) around the star due to B channel overexposure. \u003c\/span\u003e\u003cspan\u003eAntlia \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eLRGB-V Pro series filters block the emission line around 589nm by the design of wide gap between G and R \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003efilters, which suppresses much of the light pollution from high pressure sodium and mercury street lamps and results \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003ein a more natural color balance. The uniformity in substrate thickness delivers good parfocal performance across all \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eAnt\u003cspan\u003elia\u003c\/span\u003e filters.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHighlights of LRGB-V Pro Series Set \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePremium coating technology and finely polished substrate.\u003c\/em\u003e Ant\u003cspan\u003elia\u003c\/span\u003e quality selection processes are optimized to ensure highly homogeneous glass-substrates. The application of advanced optical coating technology and double-sided precision polishing achieves both consistent parfocal and optical performance across all filters.\u003c\/p\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003cp\u003e\u003cem\u003eMaximized colour balance and contrast for each of the three RGB channels and excellent S\/N performance.\u003c\/em\u003e Dozens of coating layers are deposited on both sides of the glass substrate that enables LRGB-V Pro filters to achieve a high SNR. The anti-reflection coatings and carefully designed spectral gaps minimize unwanted light scatter and maximize useful signal data for each filter channel.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eTighter star profiles and halo reduction. \u003c\/em\u003eThe cut-off rate of LRGB-V Pro series set is designed in high level to minimize halos around brighter stars and reduce star bloat. Our careful design of the blue channel transmission characteristics targets the problem of blue star bloating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1. Designed for monochrome CCD and CMOS cameras \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2. Great imaging colors for celestial objects, galaxies, star clusters and nebulae \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e3. AR anti-reflection film design for secondary reflection and star halo reduction \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e4. R-Filter provides maximum transmission of H-alpha and S II emission \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e5. B\/G overlap doubles the energy in the OIII line \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e6. Balanced RGB-design offer 1:1:1 exposure times for most telescope optical systems \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e7. All Antlia LRGB-V Pro filters are edge blackened to eliminate internal reflections from stray light \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e8. The substrate thickness of each of the four LRGB filers is maintained to tight tolerances \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e9. Not recommended for Solar observing and imaging \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e10. Not recommended for visual observation\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cem\u003eImportant Note:\u003c\/em\u003e\u003c\/strong\u003e When using any parfocal filters, the user may still experience focus shifts between filters during long imaging sessions. It is important to remember that temperature shifts will change the length of the optical path due to the differential contraction between the telescope tube and the glass optical elements. It is recommended that the photographers check focus either manually or automatically in software every 1 to 2 hours. In cases where the telescope has been brought from a warm environment to outside, more frequent focus checks are required until the equipment has stabilized nearer to ambient temperature. \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBasic Substrate: optical substrate \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFilter Thickness: \u003c\/span\u003e\u003cspan\u003e2mm+\/-0.05mm for 1.25’’\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830) \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront: Lambda\/4 or better. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eParallelism: less than 30 arcsec \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSingle \/ Non-glued substrate\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWarranty: 3-years against delamination \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1.25’’(M28.5*0.6)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUltra-thin filter cell to minimize vignetting \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBlack anodized finish Laser engraving \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNo fading\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eIn the box: \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia LRGB-V Pro series 1.25\" mounted set includes Luminance (IR\/UV-blocked colorless), Red, Green and Blue filters\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674804527217,"sku":"ATL-LRGB-V-PRO-125","price":426.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/LRGB-V-PRO-125.jpg?v=1776459187"},{"product_id":"antila-lrgb-v-pro-filter-set-2-lrgb-v-pro-2","title":"Antlia LRGB V Pro Filter Set - 2\" - LRGB-V-PRO-2","description":"\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eAntlia LRGB-V Pro Filter Set - 2\" Mounted\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia LRGB-V Pro series filters are designed for monochrome cameras that use both CCD and CMOS sensors. \u003c\/span\u003e\u003cspan\u003eSuitable \u003c\/span\u003e\u003cspan\u003esensors \u003c\/span\u003e\u003cspan\u003einclude KAF\/KAI sensors, Sony IMX sensors, GSENSE and other sensor manufacturers. The \u003c\/span\u003e\u003cspan\u003eLRGB-V \u003c\/span\u003e\u003cspan\u003ePro set \u003c\/span\u003e\u003cspan\u003eis designed \u003c\/span\u003e\u003cspan\u003eto approximately equalize the RGB response \u003c\/span\u003e\u003cspan\u003efrom \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003eflux of red-sensitive \u003c\/span\u003e\u003cspan\u003eCCD \u003c\/span\u003e\u003cspan\u003edetectors. The result is that \u003c\/span\u003e\u003cspan\u003eyou achieve 1:1:1 equalized RGB \u003c\/span\u003e\u003cspan\u003eexposures \u003c\/span\u003e\u003cspan\u003ewith \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003ebenefit of \u003c\/span\u003e\u003cspan\u003esimplified \u003c\/span\u003e\u003cspan\u003epost \u003c\/span\u003e\u003cspan\u003eprocessing and reduced imaging time. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe LRGB-V Pro series filters feature a \u003c\/span\u003e\u003cspan\u003ecarefully designed spectral \u003c\/span\u003e\u003cspan\u003egap between \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003egreen and red \u003c\/span\u003e\u003cspan\u003echannels to \u003c\/span\u003e\u003cspan\u003eminimize the effect of light pollution and \u003c\/span\u003e\u003cspan\u003eto provide high transmittance of useful \u003c\/span\u003e\u003cspan\u003efrequencies. \u003c\/span\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003efilters’ design \u003c\/span\u003e\u003cspan\u003emaximizes the capture of details from fainter galaxies and nebulae emissions. \u003c\/span\u003e\u003cspan\u003eThe LRGB-V Pro series \u003c\/span\u003e\u003cspan\u003efilters guarantee the high transmission \u003c\/span\u003e\u003cspan\u003eof \u003c\/span\u003e\u003cspan\u003ethe OIII band in \u003c\/span\u003e\u003cspan\u003eboth the B \u003c\/span\u003e\u003cspan\u003eand \u003c\/span\u003e\u003cspan\u003eG filters \u003c\/span\u003e\u003cspan\u003e(OIII \u003c\/span\u003e\u003cspan\u003esignal \u0026gt;95% in blue and \u003c\/span\u003e\u003cspan\u003egreen). The bandwidth of the B channel \u003c\/span\u003e\u003cspan\u003eis \u003c\/span\u003e\u003cspan\u003enarrowed for the \u003c\/span\u003e\u003cspan\u003epurpose of improving the \u003c\/span\u003e\u003cspan\u003eblue \u003c\/span\u003e\u003cspan\u003echannel overflow (haloing) around the star due to B channel overexposure. \u003c\/span\u003e\u003cspan\u003eAntlia LRGB-V Pro series filters block the emission line around 589nm by the design of wide gap between G and R \u003c\/span\u003e\u003cspan\u003efilters, which suppresses much of the light pollution from high pressure sodium and mercury street lamps and results \u003c\/span\u003e\u003cspan\u003ein a more natural color balance. The uniformity in substrate thickness delivers good parfocal performance across all \u003c\/span\u003e\u003cspan\u003eAntlia filters.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHighlights of LRGB-V Pro Series Set \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePremium coating technology and finely polished substrate.\u003c\/em\u003e Antila quality selection processes are optimized to ensure highly homogeneous glass-substrates. The application of advanced optical coating technology and double-sided precision polishing achieves both consistent parfocal and optical performance across all filters.\u003c\/p\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003cp\u003e\u003cem\u003eMaximized colour balance and contrast for each of the three RGB channels and excellent S\/N performance.\u003c\/em\u003e Dozens of coating layers are deposited on both sides of the glass substrate that enables LRGB-V Pro filters to achieve a high SNR. The anti-reflection coatings and carefully designed spectral gaps minimize unwanted light scatter and maximize useful signal data for each filter channel.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eTighter star profiles and halo reduction. \u003c\/em\u003eThe cut-off rate of LRGB-V Pro series set is designed in high level to minimize halos around brighter stars and reduce star bloat. Our careful design of the blue channel transmission characteristics targets the problem of blue star bloating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1. Designed for monochrome CCD and CMOS cameras \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2. Great imaging colors for celestial objects, galaxies, star clusters and nebulae \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e3. AR anti-reflection film design for secondary reflection and star halo reduction \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e4. R-Filter provides maximum transmission of H-alpha and S II emission \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e5. B\/G overlap doubles the energy in the OIII line \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e6. Balanced RGB-design offer 1:1:1 exposure times for most telescope optical systems \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e7. All Antlia LRGB-V Pro filters are edge blackened to eliminate internal reflections from stray light \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e8. The substrate thickness of each of the four LRGB filers is maintained to tight tolerances \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e9. Not recommended for Solar observing and imaging \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e10. Not recommended for visual observation\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cem\u003eImportant Note:\u003c\/em\u003e\u003c\/strong\u003e When using any parfocal filters, the user may still experience focus shifts between filters during long imaging sessions. It is important to remember that temperature shifts will change the length of the optical path due to the differential contraction between the telescope tube and the glass optical elements. It is recommended that the photographers check focus either manually or automatically in software every 1 to 2 hours. In cases where the telescope has been brought from a warm environment to outside, more frequent focus checks are required until the equipment has stabilized nearer to ambient temperature. \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBasic Substrate: optical substrate \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFilter Thickness: \u003c\/span\u003e\u003cspan\u003e2mm+\/-0.05mm for 2’’\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830) \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront: Lambda\/4 or better. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eParallelism: less than 30 arcsec \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSingle \/ Non-glued substrate\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWarranty: 3-years against delamination \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2\"(M48*0.75)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUltra-thin filter cell to minimize vignetting \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBlack anodized finish Laser engraving \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNo fading\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eIn the box: \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia LRGB-V Pro series 2\" mounted set includes Luminance (IR\/UV-blocked colorless), Red, Green and Blue filters\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674808066161,"sku":"ATL-LRGB-V-PRO-2","price":667.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/LRGB-V-PRO-2.jpg?v=1776459317"},{"product_id":"antlia-lrgb-v-pro-filter-set-36mm-lrgb-v-pro-36","title":"Antlia LRGB V Pro Filter Set - 36mm - LRGB-V-PRO-36","description":"\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eAntlia LRGB-V Pro Filter Set - 36mm Unmounted\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia LRGB-V Pro series filters are designed for monochrome cameras that use both CCD and CMOS sensors. \u003c\/span\u003e\u003cspan\u003eSuitable \u003c\/span\u003e\u003cspan\u003esensors \u003c\/span\u003e\u003cspan\u003einclude KAF\/KAI sensors, Sony IMX sensors, GSENSE and other sensor manufacturers. The \u003c\/span\u003e\u003cspan\u003eLRGB-V \u003c\/span\u003e\u003cspan\u003ePro set \u003c\/span\u003e\u003cspan\u003eis designed \u003c\/span\u003e\u003cspan\u003eto approximately equalize the RGB response \u003c\/span\u003e\u003cspan\u003efrom \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003eflux of red-sensitive \u003c\/span\u003e\u003cspan\u003eCCD \u003c\/span\u003e\u003cspan\u003edetectors. The result is that \u003c\/span\u003e\u003cspan\u003eyou achieve 1:1:1 equalized RGB \u003c\/span\u003e\u003cspan\u003eexposures \u003c\/span\u003e\u003cspan\u003ewith \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003ebenefit of \u003c\/span\u003e\u003cspan\u003esimplified \u003c\/span\u003e\u003cspan\u003epost \u003c\/span\u003e\u003cspan\u003eprocessing and reduced imaging time. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe LRGB-V Pro series filters feature a \u003c\/span\u003e\u003cspan\u003ecarefully designed spectral \u003c\/span\u003e\u003cspan\u003egap between \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003egreen and red \u003c\/span\u003e\u003cspan\u003echannels to \u003c\/span\u003e\u003cspan\u003eminimize the effect of light pollution and \u003c\/span\u003e\u003cspan\u003eto provide high transmittance of useful \u003c\/span\u003e\u003cspan\u003efrequencies. \u003c\/span\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003efilters’ design \u003c\/span\u003e\u003cspan\u003emaximizes the capture of details from fainter galaxies and nebulae emissions. \u003c\/span\u003e\u003cspan\u003eThe LRGB-V Pro series \u003c\/span\u003e\u003cspan\u003efilters guarantee the high transmission \u003c\/span\u003e\u003cspan\u003eof \u003c\/span\u003e\u003cspan\u003ethe OIII band in \u003c\/span\u003e\u003cspan\u003eboth the B \u003c\/span\u003e\u003cspan\u003eand \u003c\/span\u003e\u003cspan\u003eG filters \u003c\/span\u003e\u003cspan\u003e(OIII \u003c\/span\u003e\u003cspan\u003esignal \u0026gt;95% in blue and \u003c\/span\u003e\u003cspan\u003egreen). The bandwidth of the B channel \u003c\/span\u003e\u003cspan\u003eis \u003c\/span\u003e\u003cspan\u003enarrowed for the \u003c\/span\u003e\u003cspan\u003epurpose of improving the \u003c\/span\u003e\u003cspan\u003eblue \u003c\/span\u003e\u003cspan\u003echannel overflow (haloing) around the star due to B channel overexposure. \u003c\/span\u003e\u003cspan\u003eAntlia LRGB-V Pro series filters block the emission line around 589nm by the design of wide gap between G and R \u003c\/span\u003e\u003cspan\u003efilters, which suppresses much of the light pollution from high pressure sodium and mercury street lamps and results \u003c\/span\u003e\u003cspan\u003ein a more natural color balance. The uniformity in substrate thickness delivers good parfocal performance across all \u003c\/span\u003e\u003cspan\u003eAntlia filters.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHighlights of LRGB-V Pro Series Set \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePremium coating technology and finely polished substrate.\u003c\/em\u003e Antlia quality selection processes are optimized to ensure highly homogeneous glass-substrates. The application of advanced optical coating technology and double-sided precision polishing achieves both consistent parfocal and optical performance across all filters.\u003c\/p\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003cp\u003e\u003cem\u003eMaximized colour balance and contrast for each of the three RGB channels and excellent S\/N performance.\u003c\/em\u003e Dozens of coating layers are deposited on both sides of the glass substrate that enables LRGB-V Pro filters to achieve a high SNR. The anti-reflection coatings and carefully designed spectral gaps minimize unwanted light scatter and maximize useful signal data for each filter channel.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eTighter star profiles and halo reduction. \u003c\/em\u003eThe cut-off rate of LRGB-V Pro series set is designed in high level to minimize halos around brighter stars and reduce star bloat. Our careful design of the blue channel transmission characteristics targets the problem of blue star bloating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1. Designed for monochrome CCD and CMOS cameras \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2. Great imaging colors for celestial objects, galaxies, star clusters and nebulae \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e3. AR anti-reflection film design for secondary reflection and star halo reduction \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e4. R-Filter provides maximum transmission of H-alpha and S II emission \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e5. B\/G overlap doubles the energy in the OIII line \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e6. Balanced RGB-design offer 1:1:1 exposure times for most telescope optical systems \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e7. All Antlia LRGB-V Pro filters are edge blackened to eliminate internal reflections from stray light \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e8. The substrate thickness of each of the four LRGB filers is maintained to tight tolerances \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e9. Not recommended for Solar observing and imaging \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e10. Not recommended for visual observation\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cem\u003eImportant Note:\u003c\/em\u003e\u003c\/strong\u003e When using any parfocal filters, the user may still experience focus shifts between filters during long imaging sessions. It is important to remember that temperature shifts will change the length of the optical path due to the differential contraction between the telescope tube and the glass optical elements. It is recommended that the photographers check focus either manually or automatically in software every 1 to 2 hours. In cases where the telescope has been brought from a warm environment to outside, more frequent focus checks are required until the equipment has stabilized nearer to ambient temperature. \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBasic Substrate: optical substrate \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFilter Thickness: \u003c\/span\u003e\u003cspan\u003e2mm+\/-0.05mm for 36mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830) \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront: Lambda\/4 or better. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eParallelism: less than 30 arcsec \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSingle \/ Non-glued substrate\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWarranty: 3-years against delamination \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eIn the box: \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntllia LRGB-V Pro series 36mm unmounted set includes Luminance (IR\/UV-blocked colorless), Red, Green and Blue filters\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":41674816487537,"sku":"ATL-LRGB-V-PRO-36","price":511.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/LRGB-V-PRO-36.jpg?v=1776459255"},{"product_id":"antlia-alp-t-dualband-5nm-ha-oiii-filter-2-alpt-db-5nm-haoiii-2","title":"Antlia ALP-T Dualband 5nm HA \u0026 OIII Filter - 2\" - ALPT-DB-5NM-HAOIII-2","description":"\u003cp\u003eThis ALP-T, or Anti-Light Pollution Filter, allows a 5nm narrowband transmission from both the OIII and H-Alpha bands!  This model comes in a 2\" threaded filter cell, which allows it to be connected to the 2\" threaded accessory of your choice, including a 2\" filter wheel or filter holder. For f\/4 or slower telescopes.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eImportant!  Do not use this filter for solar viewing or imaging!\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia ALP-T Dualband 5nm H-Alpha \u0026amp; OIII Filter - 2\"\u003c\/h3\u003e\n\u003cp\u003eThis dual narrowband filter lets the red H-alpha (656.3nm) and the blue-green OIII (500.7nm) lines through, and is primarily engineered for color cameras when great SNR is desired when taking deep sky images. With an FWHM half-bandwidth designed at 5nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the Ha and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe Ha\/OIII dual-band Antlia filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from background light pollution.\u003c\/p\u003e\n\n\u003cp\u003eThe Antlia ALP-T dual band 5nm Ha \u0026amp; OIII filter is a dual line-pass filter designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. This dual-band filter can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on the Antlia ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII light from emission nebulae, with almost total suppression on unwanted wavelengths from light pollution, moonlight, and airglow with an optical density(OD) of 4.5. The result is that the Antlia ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003eFWHM:  5nm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nHa CWL (Central Wavelength):  656.3nm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nOIII CWL (Central Wavelength):  500.7nm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nHa Peak Transmission:  92%\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nOIII Peak Transmission:  88%\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nBlocking:  OD4.5 @ 300-1100nm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nFilter Thickness:  2mm +\/- 0.05mm\u003c\/li\u003e\u003c\/ul\u003e\n\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nExtremely steep bandpass edges minimize internal reflections\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nIdeal flat-top and moderate bandpass reducing spectrum down shifts\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nIon Gun Assisted Deposition coating technology on the double-sided polished substrate, making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nDesigned to suppress artificial light from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e2\" (M48*0.75) Filter Ring\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nBlack anodized finish on filter cell\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nEngraving on the filter cell is done with a laser for no fading\u003c\/li\u003e\u003c\/ul\u003e\n\n\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eThis filter cannot be used for solar imaging.  It is also not recommended that you employ this filter for visual observations.\u003cbr\u003e\u003cbr\u003e\n\nDO NOT LOOK AT THE SUN WITH THIS FILTER; IT WILL CAUSE SERIOUS EYE DAMAGE.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42037462270065,"sku":"ATL-ALPT-DB-5NM-HAOIII-2","price":539.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/ALP-T_Dual_5nm_HAOIII_2.jpg?v=1776459093"},{"product_id":"antlia-alp-t-dualband-5nm-ha-oiii-highspeed-filter-2-alpt-db-5nm-haoiii-hs-2","title":"Antlia ALP-T Dualband 5nm HA \u0026 OIII  Filter - High Speed Version for f\/2.2 - f\/3.6 Optics - 2\" - ALPT-DB-5NM-HAOIII-HS-2","description":"\u003ch3\u003eAbout the High Speed Characteristics of this Dual Ha\/OIII 5nm Filter...\u003c\/h3\u003e\n\u003cp\u003eThe Antlia ALP-T Dual Band 5nm Highspeed Filters are further optimized to work with very fast imaging systems by shifting the passband and center wavelength slightly. Using these highspeed filters with optical focal ratios between f\/2.2 and f\/3.6 shows more contrast in nebulae imaging compared to the standard version of this filter.\u003c\/p\u003e\n\u003cp\u003eFor f-ratios slower than f\/3.6, the standard \u003ca href=\"https:\/\/khanscope.com\/products\/antlia-alp-t-dualband-5nm-ha-oiii-filter-2-alpt-db-5nm-haoiii-2\" target=\"_blank\" title='Antlia ALP-T Dual Band HA\/OIII 2\" Filter' rel=\"noopener\"\u003eALP-T Dual Band 5nm Ha\/OIII filter\u003c\/a\u003e is highly recommended. Meanwhile, if you seek the best possible performance with any optics faster than f\/3.6, this highspeed version is the best choice.\u003c\/p\u003e\n\u003cp\u003eIt is important to keep in mind, however, that the blue shift data by computer simulation indicates that this narrowband filter shifts its bandwidth to shorter wavelengths with optics faster than f\/2, and transmission at the emission wavelength may decrease perhaps 15%-20%. Although the Antlia ALP-T highspeed filter has similar transmission rate reduction in the H-a and OIII when the filter is used on fast optics, based on current standard version users’ data, it is evident that the filter still has a high performance increase in emission nebula contrast and minimized halo.\u003c\/p\u003e\n\u003ch3\u003eNow for the General Filter Characteristics...\u003c\/h3\u003e\n\u003cp\u003eThis ALP-T, or Anti-Light Pollution Filter, allows a 5nm narrowband transmission from both the OIII and H-Alpha bands!  This model comes in a 2\" threaded filter cell, which allows it to be connected to the 2\" threaded accessory of your choice, including a 2\" filter wheel or filter holder. For f\/4 or slower telescopes.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eImportant!  Do not use this filter for solar viewing or imaging!\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia ALP-T Dualband 5nm H-Alpha \u0026amp; OIII Filter - 2\"\u003c\/h3\u003e\n\u003cp\u003eThis dual narrowband filter lets the red H-alpha (656.3nm) and the blue-green OIII (500.7nm) lines through, and is primarily engineered for color cameras when great SNR is desired when taking deep sky images. With an FWHM half-bandwidth designed at 5nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the Ha and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe Ha\/OIII dual-band Antlia filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from background light pollution.\u003c\/p\u003e\n\u003cp\u003eThe Antlia ALP-T dual band 5nm Ha \u0026amp; OIII filter is a dual line-pass filter designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. This dual-band filter can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on the Antlia ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII light from emission nebulae, with almost total suppression on unwanted wavelengths from light pollution, moonlight, and airglow with an optical density(OD) of 4.5. The result is that the Antlia ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 5nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eHa CWL (Central Wavelength): 657.8nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eOIII CWL (Central Wavelength): 502.2nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eHa Peak Transmission: 88%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eOIII Peak Transmission: 82%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eBlocking: OD4.5 @ 300-1050nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eFilter Thickness: 2mm +\/- 0.05mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned especially for fast astronomy optics, in particular f-ratios f\/2.2 to f\/3.6\u003c\/li\u003e\n\u003c\/ul\u003e\u003cul\u003e\n\u003cli\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eExtremely steep bandpass edges minimize internal reflections\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate, making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned to suppress artificial light from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1050nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003e2\" (M48*0.75) Filter Ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eBlack anodized finish on filter cell\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eEngraving on the filter cell is done with a laser for no fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eThis filter cannot be used for solar imaging. It is also not recommended that you employ this filter for visual observations.\u003cbr\u003e\u003cbr\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER; IT WILL CAUSE SERIOUS EYE DAMAGE.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42037511258225,"sku":"ATL-ALPT-DB-5NM-HAOIII-HS-2","price":539.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/ALP-T_DB_5NM-HAOIII-HS-2.jpg?v=1776458956"},{"product_id":"antlia-alp-t-dualband-3nm-sii-oiii-filter-2-alp-t-3nm-sii-oiii-2","title":"Antlia ALP-T Dualband 3nm SII \u0026 OIII Filter - 2\" - ALP-T-3NM-SII\/OIII-2","description":"\u003cp\u003eThis ALP-T, or Anti-Light Pollution Filter, allows a 3nm narrowband transmission from both the OIII and SII bands!  This model comes in a 2\" threaded filter cell, which allows it to be connected to the 2\" threaded accessory of your choice, including a 2\" filter wheel or filter holder. For f\/4 or slower telescopes.\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia ALP-T Dualband 3nm SII \u0026amp; OIII Filter - 2\"\u003c\/h3\u003e\n\u003cp\u003eThis dual narrowband filter \u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003elets the deep red Sulfur-II 672.4nm and the blue-green OIII (500.7nm) \u003c\/span\u003elines through, and is primarily engineered for color cameras when great SNR is desired when taking deep sky images. With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the SII and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures and Application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses OIII 500.7nm and SII 672.4nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the red and blue-green at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eRecommended to be used with ALP-T Dual Band Ha\u0026amp;OIII filter to create images with better SNR( signal-to-noise) and better isolation between the channels\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.5\/-0.5nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength): Sulfur II: 672.4nm, Oxygen III: 500.7nm\u003c\/li\u003e\n\u003cli\u003ePeak Transmission: SII: 90%, Oxygen III: 85%\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003cli\u003eParallelism: less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":42926686830705,"sku":null,"price":546.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/SII_OIII_Dual_Band_ALP_T_Filter.jpg?v=1776459064"},{"product_id":"antlia-lrgb-v-pro-filter-set-31-mm-lrgb-v-pro-31","title":"Antlia LRGB V Pro Filter Set - 31 mm - LRGB-V-PRO-31","description":"\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eAntlia LRGB-V Pro Filter Set - 31 mm Unmounted\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia LRGB-V Pro series filters are designed for monochrome cameras that use both CCD and CMOS sensors. \u003c\/span\u003e\u003cspan\u003eSuitable \u003c\/span\u003e\u003cspan\u003esensors \u003c\/span\u003e\u003cspan\u003einclude KAF\/KAI sensors, Sony IMX sensors, GSENSE and other sensor manufacturers. The \u003c\/span\u003e\u003cspan\u003eLRGB-V \u003c\/span\u003e\u003cspan\u003ePro set \u003c\/span\u003e\u003cspan\u003eis designed \u003c\/span\u003e\u003cspan\u003eto approximately equalize the RGB response \u003c\/span\u003e\u003cspan\u003efrom \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003eflux of red-sensitive \u003c\/span\u003e\u003cspan\u003eCCD \u003c\/span\u003e\u003cspan\u003edetectors. The result is that \u003c\/span\u003e\u003cspan\u003eyou achieve 1:1:1 equalized RGB \u003c\/span\u003e\u003cspan\u003eexposures \u003c\/span\u003e\u003cspan\u003ewith \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003ebenefit of \u003c\/span\u003e\u003cspan\u003esimplified \u003c\/span\u003e\u003cspan\u003epost \u003c\/span\u003e\u003cspan\u003eprocessing and reduced imaging time. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe LRGB-V Pro series filters feature a \u003c\/span\u003e\u003cspan\u003ecarefully designed spectral \u003c\/span\u003e\u003cspan\u003egap between \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003egreen and red \u003c\/span\u003e\u003cspan\u003echannels to \u003c\/span\u003e\u003cspan\u003eminimize the effect of light pollution and \u003c\/span\u003e\u003cspan\u003eto provide high transmittance of useful \u003c\/span\u003e\u003cspan\u003efrequencies. \u003c\/span\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003efilters’ design \u003c\/span\u003e\u003cspan\u003emaximizes the capture of details from fainter galaxies and nebulae emissions. \u003c\/span\u003e\u003cspan\u003eThe LRGB-V Pro series \u003c\/span\u003e\u003cspan\u003efilters guarantee the high transmission \u003c\/span\u003e\u003cspan\u003eof \u003c\/span\u003e\u003cspan\u003ethe OIII band in \u003c\/span\u003e\u003cspan\u003eboth the B \u003c\/span\u003e\u003cspan\u003eand \u003c\/span\u003e\u003cspan\u003eG filters \u003c\/span\u003e\u003cspan\u003e(OIII \u003c\/span\u003e\u003cspan\u003esignal \u0026gt;95% in blue and \u003c\/span\u003e\u003cspan\u003egreen). The bandwidth of the B channel \u003c\/span\u003e\u003cspan\u003eis \u003c\/span\u003e\u003cspan\u003enarrowed for the \u003c\/span\u003e\u003cspan\u003epurpose of improving the \u003c\/span\u003e\u003cspan\u003eblue \u003c\/span\u003e\u003cspan\u003echannel overflow (haloing) around the star due to B channel overexposure. \u003c\/span\u003e\u003cspan\u003eAntlia LRGB-V Pro series filters block the emission line around 589nm by the design of wide gap between G and R \u003c\/span\u003e\u003cspan\u003efilters, which suppresses much of the light pollution from high pressure sodium and mercury street lamps and results \u003c\/span\u003e\u003cspan\u003ein a more natural color balance. The uniformity in substrate thickness delivers good parfocal performance across all \u003c\/span\u003e\u003cspan\u003eAntlia filters.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHighlights of LRGB-V Pro Series Set \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePremium coating technology and finely polished substrate.\u003c\/em\u003e Antlia quality selection processes are optimized to ensure highly homogeneous glass-substrates. The application of advanced optical coating technology and double-sided precision polishing achieves both consistent parfocal and optical performance across all filters.\u003c\/p\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003cp\u003e\u003cem\u003eMaximized colour balance and contrast for each of the three RGB channels and excellent S\/N performance.\u003c\/em\u003e Dozens of coating layers are deposited on both sides of the glass substrate that enables LRGB-V Pro filters to achieve a high SNR. The anti-reflection coatings and carefully designed spectral gaps minimize unwanted light scatter and maximize useful signal data for each filter channel.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eTighter star profiles and halo reduction. \u003c\/em\u003eThe cut-off rate of LRGB-V Pro series set is designed in high level to minimize halos around brighter stars and reduce star bloat. Our careful design of the blue channel transmission characteristics targets the problem of blue star bloating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1. Designed for monochrome CCD and CMOS cameras \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2. Great imaging colors for celestial objects, galaxies, star clusters and nebulae \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e3. AR anti-reflection film design for secondary reflection and star halo reduction \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e4. R-Filter provides maximum transmission of H-alpha and S II emission \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e5. B\/G overlap doubles the energy in the OIII line \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e6. Balanced RGB-design offer 1:1:1 exposure times for most telescope optical systems \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e7. All Antlia LRGB-V Pro filters are edge blackened to eliminate internal reflections from stray light \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e8. The substrate thickness of each of the four LRGB filers is maintained to tight tolerances \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e9. Not recommended for Solar observing and imaging \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e10. Not recommended for visual observation\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cem\u003eImportant Note:\u003c\/em\u003e\u003c\/strong\u003e When using any parfocal filters, the user may still experience focus shifts between filters during long imaging sessions. It is important to remember that temperature shifts will change the length of the optical path due to the differential contraction between the telescope tube and the glass optical elements. It is recommended that the photographers check focus either manually or automatically in software every 1 to 2 hours. In cases where the telescope has been brought from a warm environment to outside, more frequent focus checks are required until the equipment has stabilized nearer to ambient temperature. \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBasic Substrate: optical substrate \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFilter Thickness: \u003c\/span\u003e\u003cspan\u003e2mm+\/-0.05mm for 31 mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830) \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront: Lambda\/4 or better. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eParallelism: less than 30 arcsec \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSingle \/ Non-glued substrate\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWarranty: 3-years against delamination \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eIn the box: \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntllia LRGB-V Pro series 31 mm unmounted set includes Luminance (IR\/UV-blocked colorless), Red, Green and Blue filters\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43012479123569,"sku":"ATL-LRGB-V-PRO-31","price":454.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/31mm_Pro_Series.jpg?v=1771259837"},{"product_id":"antlia-3nm-h-alpha-pro-series-filter-31-mm-ha-pro-3nm-31","title":"Antlia 3nm H-Alpha Pro Series Filter - 31 mm - HA-PRO-3NM-31","description":"\u003cp\u003eThis very narrowband 3 nm H-alpha filter from Antlia is part of their Pro series and is of the 31 mm unmounted variety.  It is normally used in a 1.25\"\/31mm filter wheel, where it drops into place.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eImportant! Not for use when viewing or imaging the Sun!  \u003c\/em\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series H-Alpha Filter - 31 mm Unmounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis Antlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm\u003c\/span\u003e\u003cspan\u003e bandpass\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003cspan\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eare\u003c\/span\u003e\u003cspan\u003e designed to deliver 88\u003c\/span\u003e\u003cspan\u003e% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. Antlia guarantee T\u0026gt;88% within 1nm range of the center bandwidth,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan\u003eB\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved \u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003eharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth \u003c\/span\u003e\u003cspan\u003eto maximize \u003c\/span\u003e\u003cspan\u003econtrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003edark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3\u003c\/span\u003e\u003cspan\u003e systems\u003c\/span\u003e\u003cspan\u003e with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll A\u003c\/span\u003e\u003cspan\u003entlia\u003c\/span\u003e\u003cspan\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003cspan\u003e emissions.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Schott optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness:   \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: \u003c\/span\u003e\u003cspan\u003e656.3nm\u003c\/span\u003e\u003cspan\u003enm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞88%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001%\u003c\/span\u003e\u003cspan\u003e out of band blocking\u003c\/span\u003e\u003cspan\u003e) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43012562255985,"sku":"ATL-HA-PRO-3NM-31","price":391.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/HA_Pro_31mm_Filter.jpg?v=1776459060"},{"product_id":"antlia-3nm-oiii-pro-series-filter-31-mm-oiii-pro-3nm-31","title":"Antlia 3nm OIII Pro Series Filter - 31 mm - OIII-PRO-3NM-31","description":"\u003cp\u003e\u003cspan\u003eThis very narrowband 3 nm OIII filter from Antlia is part of their Pro series and is of the 31 mm unmounted variety.  It is normally used in a 1.25\"\/31mm filter wheel, where it drops into place.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series Oxygen III Filter - 31 mm\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia OIII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm \u003c\/span\u003e\u003cspan\u003e\u003cins cite=\"mailto:Ted%20Dobosz\" datetime=\"2021-01-06T13:06\"\u003e\u003c\/ins\u003e\u003c\/span\u003e\u003cspan\u003ebandpass\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan\u003eOIII\u003c\/span\u003e\u003cspan\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eare\u003c\/span\u003e\u003cspan\u003e designed to deliver \u003c\/span\u003e\u003cspan\u003e85\u003c\/span\u003e\u003cspan\u003e% transmission at the 500.7nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eshift\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003cspan\u003e We guarantee T\u0026gt;\u003c\/span\u003e\u003cspan\u003e85\u003c\/span\u003e\u003cspan\u003e% within 1nm range of the center bandwidth, which means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan\u003eB\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eloss in emission signal and meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eoff rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved sharp cut\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eoff astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003cspan\u003e to maximize\u003c\/span\u003e\u003cspan\u003e contrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3\u003c\/span\u003e\u003cspan\u003e systems\u003c\/span\u003e\u003cspan\u003e with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll A\u003c\/span\u003e\u003cspan\u003entlia\u003c\/span\u003e\u003cspan\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain OIII emissions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness:   \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 500.7nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞85%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43012575789169,"sku":"ATL-OIII-PRO-3NM-31","price":391.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/OIII_Pro_31.jpg?v=1776458994"},{"product_id":"antlia-3nm-sii-pro-series-filter-31-mm-sii-pro-3nm-31","title":"Antlia 3nm SII Pro Series Filter - 31 mm - SII-PRO-3NM-31","description":"\u003cp\u003e\u003cspan\u003eThis very narrowband 3 nm SII filter from Antlia is part of their Pro series and is of the 31 mm unmounted variety.  It is normally used in a 1.25\"\/31mm filter wheel, where it drops into place.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series Sulfur II Filter - 31 mm Unmounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis Antlia \u003c\/span\u003e\u003cspan\u003eSII \u003c\/span\u003e\u003cspan\u003ePro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm bandpass. As the bandwidth becomes narrower, the \u003c\/span\u003e\u003cspan\u003e3nm \u003c\/span\u003e\u003cspan\u003ePro \u003c\/span\u003e\u003cspan\u003enarrowband \u003c\/span\u003e\u003cspan\u003efilters enhance contrast of emission targets by lowering the unwanted background signal. Antlia SII\u003c\/span\u003e\u003cspan\u003e 3nm Pro\u003c\/span\u003e\u003cspan\u003e filter is designed to deliver 88% transmission at the 671.6nm line\u003c\/span\u003e\u003cspan\u003e which\u003c\/span\u003e\u003cspan\u003e provides you with the maximum signal and well defined nebulae structures\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong (Center Wavelength (CWL)-shift\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eWe guarantee T\u0026gt;88% within 1nm range of the center bandwidth\u003c\/span\u003e\u003cspan\u003e,\u003c\/span\u003e\u003cspan\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems\u003c\/span\u003e\u003cspan\u003e. B\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eshift data show that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved\u003c\/span\u003e\u003cspan\u003e sharp cut-off\u003c\/span\u003e\u003cspan\u003e astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003cspan\u003e to maximize\u003c\/span\u003e\u003cspan\u003e contrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3 with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces post image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan\u003eSII\u003c\/span\u003e\u003cspan\u003e emissions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Schott optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness：\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 671.6nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞88%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43012591976561,"sku":"ATL-SII-PRO-3NM-31","price":391.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/SII_Pro_31mm.jpg?v=1776459209"},{"product_id":"antlia-4-5nm-h-alpha-edge-series-filter-31-mm-ha-edge-4-5nm-31","title":"Antlia 4.5nm H-Alpha Edge Series Filter - 31 mm - HA-EDGE-4.5NM-31","description":"\u003cp\u003e\u003cspan\u003eThis narrowband 4.5 nm H-alpha filter from Antlia is part of their Edge series and is of the 31 mm unmounted variety.  It is normally used in a 1.25\"\/31mm filter wheel, where it drops into place.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eImportant! Not for use when viewing or imaging the Sun! \u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 4.5nm Edge Series H-Alpha Filter - 31 mm Unmounted\u003c\/h3\u003e\n\u003cp\u003eAntlia H-alpha Edge narrowband filters optimize the FWHM (full width half maximum) to a 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\n\u003cp\u003eThe Antlia H-alpha 4.5nm EGDE filter is designed to deliver high transmittance at the 656.3nm line that provides you with the maximum signal to reveal the faintest H-alpha nebulae structures.\u003c\/p\u003e\n\u003cp\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the H-alpha 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\n\u003cp\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\n\u003cp\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\n\u003cp\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\n\u003cp\u003eUse in both light polluted areas and dark sites\u003c\/p\u003e\n\u003cp\u003eExtends imaging time when the moon is up\u003c\/p\u003e\n\u003cp\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\n\u003cp\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/p\u003e\n\u003cp\u003eSuperior optical reliability reduces post image processing\u003c\/p\u003e\n\u003cp\u003eThis filter is only effective for deep sky objects that contain H-alpha emissions\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/p\u003e\n\u003cp\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\n\u003cp\u003eCWL (Central Wavelength): 656.3nm\u003c\/p\u003e\n\u003cp\u003ePeak Transmission:＞90% Blocking: \u0026gt; 5 OD (out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003eTransmitted Wavefront: Lambda\/4 or better.\u003c\/p\u003e\n\u003cp\u003eParallelism: less than 30 arcsec\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43012605280369,"sku":"ATL-HA-EDGE-4.5NM-31","price":277.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/HA_Edge_31.jpg?v=1776459072"},{"product_id":"antlia-edge-4-5nm-oiii-narrowband-filter-31-mm-unmounted","title":"Antlia Edge 4.5nm OIII Narrowband Filter - 31 mm Unmounted","description":"\u003ch3\u003eAntlia OIII Edge Filter Highlights:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType: \u003c\/strong\u003e Oxygen III (OIII)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFWHM:\u003c\/strong\u003e  4.5 nm \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCWL: \u003c\/strong\u003e 500.7nm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Thickness:\u003c\/strong\u003e  2 mm +\/- 0.05 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak Transmission: \u003c\/strong\u003e 90%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e  31 mm Unmounted\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAntlia OIII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images. Antlia OIII 4.5nm EDGE filters are designed to deliver 85% transmission at the 500.7nm line that provides you with the maximum signal to reveal the faintest OIII nebulae structures.\u003c\/p\u003e\n\u003cp\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;85% within 1nm range of the center bandwidth, which means that the OIII 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eApplication and Performance: \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/p\u003e\n\u003cp\u003eSteep spectral profile minimizes halos around bright stars\u003c\/p\u003e\n\u003cp\u003eA single substrate to eliminate internal reflections\u003c\/p\u003e\n\u003cp\u003eNarrowband Objects: OIII Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/p\u003e\n\u003cp\u003eUse in light polluted areas and dark sites Extends imaging time when the moon is up\u003c\/p\u003e\n\u003cp\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/p\u003e\n\u003cp\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light Superior optical reliability reduces post image processing\u003c\/p\u003e\n\u003cp\u003eThis filter is only effective for deep sky objects that contain OIII emissions\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/p\u003e\n\u003cp\u003eFilter Thickness: 2mm+\/-0.05mm for Dia31mm\u003c\/p\u003e\n\u003cp\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/p\u003e\n\u003cp\u003eCWL (Central Wavelength): 500.7nm\u003c\/p\u003e\n\u003cp\u003ePeak Transmission: \u0026gt;85% Blocking: \u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/p\u003e\n\u003cp\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003cp\u003eTransmitted Wavefront: Lambda\/4 or better. Parallelism: less than 30 arcsec\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWarranty: \u003c\/strong\u003e3-years against delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43015702708337,"sku":"ATL-OIII-EDGE-4.5NM-31","price":277.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/Edge_OIII_31.jpg?v=1771354606"},{"product_id":"antlia-edge-4-5nm-sii-narrowband-filter-31-mm-unmounted","title":"Antlia Edge 4.5nm SII Narrowband Filter - 31 mm Unmounted","description":"\u003ch3\u003eAntlia OIII Edge Filter Highlights:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType: \u003c\/strong\u003e Sulfur (SII)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFWHM:\u003c\/strong\u003e  4.5 nm \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCWL: \u003c\/strong\u003e 672.4nm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Thickness:\u003c\/strong\u003e  2 mm +\/- 0.05 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak Transmission: \u003c\/strong\u003e 90%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e  31 mm Unmounted\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAntlia SII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwanted wavelengths and the excellent transmittance characteristics found in the Antlia 3nm Pro series has been incorporated into the 4.5nm EDGE narrowband filters. The result is that these filters deliver superior SNR(signal to noise ratio) and better contrast in your images.\u003c\/p\u003e\n\u003cp\u003eAntlia SII 4.5nm EGDE filters are designed to deliver high transmittance at the 672.4nm line that provides you with the maximum signal to reveal the faintest SII nebulae structures.\u003c\/p\u003e\n\u003cp\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;90% within 1nm range of the center bandwidth, which means that the SII 4.5nm EDGE narrowband filters can guarantee high transmittance for working with both long focal ratios and fast optical systems. Blue-shift data shows that Antlia 4.5nm EDGE filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal and meets the requirements of fast optics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and narrow bandwidth to maximize contrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia narrowband EDGE filters can be used down to f\/3 systems with minimal loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia unmounted filters are edge blackened to eliminate internal reflections from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces post image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is only effective for deep sky objects that contain SII emissions\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFWHM (Full width at half maximum): 4.5nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCWL (Central Wavelength): 672.4nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePeak Transmission: ＞90%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBlocking: \u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront: Lambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eParallelism: less than 30 arcsec\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWarranty: 3-years against delamination\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43015702872177,"sku":"ATL-SII-EDGE-4.5NM-31","price":277.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/Edge_SII_31.jpg?v=1771355007"},{"product_id":"antlia-lrgb-v-pro-filter-set-2-lrgb-v-pro-2-pre-owned","title":"Antlia LRGB V Pro Filter Set - 2\" - LRGB-V-PRO-2 (Pre-owned)","description":"\u003cp\u003e\u003cspan style=\"color: rgb(247, 8, 8);\"\u003e\u003cstrong\u003eIn good condition.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eAntlia LRGB-V Pro Filter Set - 2\" Mounted\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia LRGB-V Pro series filters are designed for monochrome cameras that use both CCD and CMOS sensors. \u003c\/span\u003e\u003cspan\u003eSuitable \u003c\/span\u003e\u003cspan\u003esensors \u003c\/span\u003e\u003cspan\u003einclude KAF\/KAI sensors, Sony IMX sensors, GSENSE and other sensor manufacturers. The \u003c\/span\u003e\u003cspan\u003eLRGB-V \u003c\/span\u003e\u003cspan\u003ePro set \u003c\/span\u003e\u003cspan\u003eis designed \u003c\/span\u003e\u003cspan\u003eto approximately equalize the RGB response \u003c\/span\u003e\u003cspan\u003efrom \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003eflux of red-sensitive \u003c\/span\u003e\u003cspan\u003eCCD \u003c\/span\u003e\u003cspan\u003edetectors. The result is that \u003c\/span\u003e\u003cspan\u003eyou achieve 1:1:1 equalized RGB \u003c\/span\u003e\u003cspan\u003eexposures \u003c\/span\u003e\u003cspan\u003ewith \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003ebenefit of \u003c\/span\u003e\u003cspan\u003esimplified \u003c\/span\u003e\u003cspan\u003epost \u003c\/span\u003e\u003cspan\u003eprocessing and reduced imaging time. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe LRGB-V Pro series filters feature a \u003c\/span\u003e\u003cspan\u003ecarefully designed spectral \u003c\/span\u003e\u003cspan\u003egap between \u003c\/span\u003e\u003cspan\u003ethe \u003c\/span\u003e\u003cspan\u003egreen and red \u003c\/span\u003e\u003cspan\u003echannels to \u003c\/span\u003e\u003cspan\u003eminimize the effect of light pollution and \u003c\/span\u003e\u003cspan\u003eto provide high transmittance of useful \u003c\/span\u003e\u003cspan\u003efrequencies. \u003c\/span\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cspan\u003efilters’ design \u003c\/span\u003e\u003cspan\u003emaximizes the capture of details from fainter galaxies and nebulae emissions. \u003c\/span\u003e\u003cspan\u003eThe LRGB-V Pro series \u003c\/span\u003e\u003cspan\u003efilters guarantee the high transmission \u003c\/span\u003e\u003cspan\u003eof \u003c\/span\u003e\u003cspan\u003ethe OIII band in \u003c\/span\u003e\u003cspan\u003eboth the B \u003c\/span\u003e\u003cspan\u003eand \u003c\/span\u003e\u003cspan\u003eG filters \u003c\/span\u003e\u003cspan\u003e(OIII \u003c\/span\u003e\u003cspan\u003esignal \u0026gt;95% in blue and \u003c\/span\u003e\u003cspan\u003egreen). The bandwidth of the B channel \u003c\/span\u003e\u003cspan\u003eis \u003c\/span\u003e\u003cspan\u003enarrowed for the \u003c\/span\u003e\u003cspan\u003epurpose of improving the \u003c\/span\u003e\u003cspan\u003eblue \u003c\/span\u003e\u003cspan\u003echannel overflow (haloing) around the star due to B channel overexposure. \u003c\/span\u003e\u003cspan\u003eAntlia LRGB-V Pro series filters block the emission line around 589nm by the design of wide gap between G and R \u003c\/span\u003e\u003cspan\u003efilters, which suppresses much of the light pollution from high pressure sodium and mercury street lamps and results \u003c\/span\u003e\u003cspan\u003ein a more natural color balance. The uniformity in substrate thickness delivers good parfocal performance across all \u003c\/span\u003e\u003cspan\u003eAntlia filters.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHighlights of LRGB-V Pro Series Set \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePremium coating technology and finely polished substrate.\u003c\/em\u003e Antila quality selection processes are optimized to ensure highly homogeneous glass-substrates. The application of advanced optical coating technology and double-sided precision polishing achieves both consistent parfocal and optical performance across all filters.\u003c\/p\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003cp\u003e\u003cem\u003eMaximized colour balance and contrast for each of the three RGB channels and excellent S\/N performance.\u003c\/em\u003e Dozens of coating layers are deposited on both sides of the glass substrate that enables LRGB-V Pro filters to achieve a high SNR. The anti-reflection coatings and carefully designed spectral gaps minimize unwanted light scatter and maximize useful signal data for each filter channel.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eTighter star profiles and halo reduction. \u003c\/em\u003eThe cut-off rate of LRGB-V Pro series set is designed in high level to minimize halos around brighter stars and reduce star bloat. Our careful design of the blue channel transmission characteristics targets the problem of blue star bloating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1. Designed for monochrome CCD and CMOS cameras \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2. Great imaging colors for celestial objects, galaxies, star clusters and nebulae \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e3. AR anti-reflection film design for secondary reflection and star halo reduction \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e4. R-Filter provides maximum transmission of H-alpha and S II emission \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e5. B\/G overlap doubles the energy in the OIII line \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e6. Balanced RGB-design offer 1:1:1 exposure times for most telescope optical systems \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e7. All Antlia LRGB-V Pro filters are edge blackened to eliminate internal reflections from stray light \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e8. The substrate thickness of each of the four LRGB filers is maintained to tight tolerances \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e9. Not recommended for Solar observing and imaging \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e10. Not recommended for visual observation\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cem\u003eImportant Note:\u003c\/em\u003e\u003c\/strong\u003e When using any parfocal filters, the user may still experience focus shifts between filters during long imaging sessions. It is important to remember that temperature shifts will change the length of the optical path due to the differential contraction between the telescope tube and the glass optical elements. It is recommended that the photographers check focus either manually or automatically in software every 1 to 2 hours. In cases where the telescope has been brought from a warm environment to outside, more frequent focus checks are required until the equipment has stabilized nearer to ambient temperature. \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBasic Substrate: optical substrate \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFilter Thickness: \u003c\/span\u003e\u003cspan\u003e2mm+\/-0.05mm for 2’’\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830) \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTransmitted Wavefront: Lambda\/4 or better. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eParallelism: less than 30 arcsec \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSingle \/ Non-glued substrate\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWarranty: 3-years against delamination \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring: \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2\"(M48*0.75)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUltra-thin filter cell to minimize vignetting \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBlack anodized finish Laser engraving \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNo fading\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eIn the box: \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia LRGB-V Pro series 2\" mounted set includes Luminance (IR\/UV-blocked colorless), Red, Green and Blue filters\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43305716744305,"sku":"USED060307","price":469.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/20260603_152112.jpg?v=1780514709"},{"product_id":"antlia-3nm-sii-pro-series-filter-2-sii-pro-3nm-2-pre-owned","title":"Antlia 3nm SII Pro Series Filter - 2\" - SII-PRO-3NM-2 (Pre-owned)","description":"\u003cp\u003e\u003cspan style=\"color: rgb(248, 18, 18);\"\u003e\u003cstrong\u003eIn excellent condition.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThis very narrowband 3 nm SII filter from Antlia is part of their Pro series and comes in a 2\" threaded filter cell that is designed to be screwed on to the 2\" receptacle of your astrophotography accessory, including a 2\" filter wheel or filter drawer.  \u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series Sulfur II Filter - 2\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis Antlia \u003c\/span\u003e\u003cspan\u003eSII \u003c\/span\u003e\u003cspan\u003ePro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm bandpass. As the bandwidth becomes narrower, the \u003c\/span\u003e\u003cspan\u003e3nm \u003c\/span\u003e\u003cspan\u003ePro \u003c\/span\u003e\u003cspan\u003enarrowband \u003c\/span\u003e\u003cspan\u003efilters enhance contrast of emission targets by lowering the unwanted background signal. Antlia SII\u003c\/span\u003e\u003cspan\u003e 3nm Pro\u003c\/span\u003e\u003cspan\u003e filter is designed to deliver 88% transmission at the 671.6nm line\u003c\/span\u003e\u003cspan\u003e which\u003c\/span\u003e\u003cspan\u003e provides you with the maximum signal and well defined nebulae structures\u003c\/span\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong (Center Wavelength (CWL)-shift\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eWe guarantee T\u0026gt;88% within 1nm range of the center bandwidth\u003c\/span\u003e\u003cspan\u003e,\u003c\/span\u003e\u003cspan\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems\u003c\/span\u003e\u003cspan\u003e. B\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eshift data show that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved\u003c\/span\u003e\u003cspan\u003e sharp cut-off\u003c\/span\u003e\u003cspan\u003e astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth\u003c\/span\u003e\u003cspan\u003e to maximize\u003c\/span\u003e\u003cspan\u003e contrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: SII Emission Nebulae, Planetary, Wolf-Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and dark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3 with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll Antlia Narrowband filters are edge blackened to eliminate internal reflections from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces post image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan\u003eSII\u003c\/span\u003e\u003cspan\u003e emissions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Schott optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness：\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm for \u003c\/span\u003e\u003cspan\u003e2'' \u003c\/span\u003e\u003cspan\u003emounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFilter Cell:\u003c\/strong\u003e  M48*0.75mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: 671.6nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞88%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001% out of band blocking) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43436908249201,"sku":"USED061003","price":395.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/20260610_130407.jpg?v=1781111653"},{"product_id":"antlia-3nm-h-alpha-pro-series-filter-2-ha-pro-3nm-2-pre-owned","title":"Antlia 3nm H-Alpha Pro Series Filter - 2\" - HA-PRO-3NM-2 (Pre-owned)","description":"\u003cp\u003e\u003cspan style=\"color: rgb(251, 14, 14);\"\u003e\u003cstrong\u003eIn Excellent Condition!\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThis very narrowband 3 nm H-alpha filter from Antlia is part of their Pro series and comes in a 2\" threaded filter cell that is designed to be screwed on to the 2\" receptacle of your astrophotography accessory, including a 2\" filter wheel or filter holder.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eImportant! Not for use when viewing or imaging the Sun!  \u003c\/em\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eAntlia 3nm Pro Series H-Alpha Filter - 2\" Mounted\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis Antlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to a 3nm\u003c\/span\u003e\u003cspan\u003e bandpass\u003c\/span\u003e\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003eAs the bandwidth becomes narrower, the 3nm Pro narrowband filters enhance contrast of emission targets by lowering the unwanted background signal. Antlia \u003c\/span\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003cspan\u003e 3nm Pro filter\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eare\u003c\/span\u003e\u003cspan\u003e designed to deliver 88\u003c\/span\u003e\u003cspan\u003e% transmission at the 656.3nm line which provides you with the maximum signal and well defined nebulae structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eConventional broader narrowband filters cause a heavy loss in transmission due to the strong Center Wavelength (CWL)-shift. We guarantee T\u0026gt;88% within 1nm range of the center bandwidth,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ewhich means that the 3nm Pro narrowband filter can guarantee high transmittance for working with both long focal ratios and fast optical systems. \u003c\/span\u003e\u003cspan\u003eB\u003c\/span\u003e\u003cspan\u003elue\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eshift data shows that Antlia 3nm Pro filters can be used with nearly all systems as fast as f\/3 with minimal loss in emission signal\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eand meets the requirements of fast optics like Hyperstar and RASA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe out of band blocking specification is rated OD\u003c\/span\u003e\u003cspan\u003e5\u003c\/span\u003e\u003cspan\u003e (0.\u003c\/span\u003e\u003cspan\u003e00\u003c\/span\u003e\u003cspan\u003e1%) which delivers an excellent \u003c\/span\u003e\u003cspan\u003eSNR(\u003c\/span\u003e\u003cspan\u003esignal to noise ratio\u003c\/span\u003e\u003cspan\u003e)\u003c\/span\u003e\u003cspan\u003e and effective cut-off rate to minimize interference from other wavelengths.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eImproved \u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003eharp cut-off astrophotography 3nm Pro filters are designed to minimize halos around bright stars.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplication and Performance:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eHigh transmittance and smallest bandwidth \u003c\/span\u003e\u003cspan\u003eto maximize \u003c\/span\u003e\u003cspan\u003econtrast\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSteep spectral profile minimizes halos around bright stars\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA single substrate to eliminate internal reflections   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNarrowband Objects: H-alpha Emission Nebulae, Planetary, Wolf Rayet Nebulae and Supernova Remnants\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUse in light polluted areas and\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003edark sites\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eExtend\u003c\/span\u003e\u003cspan\u003es\u003c\/span\u003e\u003cspan\u003e imaging time when the moon is up\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAntlia narrowband Pro filters can be used \u003c\/span\u003e\u003cspan\u003edown \u003c\/span\u003e\u003cspan\u003eto F\/3\u003c\/span\u003e\u003cspan\u003e systems\u003c\/span\u003e\u003cspan\u003e with slight loss of signal\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll A\u003c\/span\u003e\u003cspan\u003entlia\u003c\/span\u003e\u003cspan\u003e Narrowband filters are edge blackened to \u003c\/span\u003e\u003cspan\u003eeliminate internal reflections\u003c\/span\u003e\u003cspan\u003e from stray light\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuperior optical reliability reduces \u003c\/span\u003e\u003cspan\u003epost image processing\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is not suited to deep sky objects that do not contain \u003c\/span\u003e\u003cspan\u003eH-alpha\u003c\/span\u003e\u003cspan\u003e emissions.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003cspan\u003e:\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBasic Substrate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Schott optical substrate\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Thickness:   \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e2mm+\/-0.05mm for \u003c\/span\u003e\u003cspan\u003e2'' \u003c\/span\u003e\u003cspan\u003emounted\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFilter Cell:\u003c\/strong\u003e  M48*0.75mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFWHM (Full width at half maximum): \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: \u003c\/span\u003e\u003cspan\u003e656.3nm\u003c\/span\u003e\u003cspan\u003enm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Transmission:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ＞88%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBlocking: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u0026gt; 5 OD(0.001%\u003c\/span\u003e\u003cspan\u003e out of band blocking\u003c\/span\u003e\u003cspan\u003e) @ 300-1000nm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSurface Quality: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTransmitted Wavefront: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallelism: \u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43436930400369,"sku":"USED061004","price":395.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/20260610_130809.jpg?v=1781111848"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/collections\/Antlia_Brand_Page_Logo.png?v=1775073473","url":"https:\/\/khanscope.com\/collections\/antlia-astronomy-filters.oembed?page=2","provider":"Khan Scope Centre","version":"1.0","type":"link"}