{"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":178.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/Edge_OIII_31.jpg?v=1771354606","url":"https:\/\/khanscope.com\/en-fr\/products\/antlia-edge-4-5nm-oiii-narrowband-filter-31-mm-unmounted","provider":"Khan Scope Centre","version":"1.0","type":"link"}