{"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","url":"https:\/\/khanscope.com\/fr\/products\/antlia-4-5nm-h-alpha-edge-series-filter-31-mm-ha-edge-4-5nm-31","provider":"Khan Scope Centre","version":"1.0","type":"link"}