{"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":346.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/ALP-T_DB_5NM-HAOIII-HS-2.jpg?v=1776458956","url":"https:\/\/khanscope.com\/fr-fr\/products\/antlia-alp-t-dualband-5nm-ha-oiii-highspeed-filter-2-alpt-db-5nm-haoiii-hs-2","provider":"Khan Scope Centre","version":"1.0","type":"link"}