{"product_id":"antlia-3nm-pro-nii-narrowband-2-filter-pro-3nm-n-2","title":"Antlia 3nm Pro NII Narrowband 2\" Filter (PRO-3NM-N-2)","description":"\u003cp\u003eThe Antlia NII Pro narrowband filter optimizes the full width at half maximum (FWHM) to a 3nm bandpass. As the bandwidth narrows, these 3nm Pro narrowband filters enhance the contrast of emission targets by effectively reducing unwanted background signals. Designed to achieve an impressive 88% transmission at the 654.8nm line, Antlia NII 3nm Pro filters provide maximum signal and well-defined nebula structures. The out-of-band blocking specification is rated at OD5 (0.001%), ensuring excellent signal-to-noise ratio (SNR) and effective cutoff rates to minimize interference from other wavelengths. These improved sharp cutoff astrophotography 3nm Pro filters are specifically engineered to reduce halos around bright stars.\u003c\/p\u003e\n\u003ch3\u003eMain Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh transmittance and smallest bandwidth to maximize contrast\u003c\/li\u003e\n\u003cli\u003eSteep spectral profile minimizes halos around bright stars\u003c\/li\u003e\n\u003cli\u003eA single substrate to eliminate internal reflections\u003c\/li\u003e\n\u003cli\u003eNarrowband Objects: NII Emission Nebulae\u003c\/li\u003e\n\u003cli\u003eUse in light polluted areas and dark sites\u003c\/li\u003e\n\u003cli\u003eExtend imaging time when the moon is up\u003c\/li\u003e\n\u003cli\u003eAll Antlia narrowband Pro filters can be used down to f\/3 with minimal loss of signal\u003c\/li\u003e\n\u003cli\u003eAll Antlia Narrowband filters unmounted are edge blackened to eliminate internal reflections from stray light\u003c\/li\u003e\n\u003cli\u003eSuperior optical reliability reduces post image processing\u003c\/li\u003e\n\u003cli\u003eThis filter is only effective for deep sky objects that contain NII emissions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM\u003c\/td\u003e\n\u003ctd\u003e3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd\u003e486.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd\u003e88%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003e≥OD5 @ 300-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/PRO-3NM-N-2-PASS.png?v=1748296049\" alt=\"\"\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":47206529728764,"sku":"PRO-3NM-N-2","price":553.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/PRO-3NM-N-2.jpg?v=1748295966","url":"https:\/\/all-startelescope.com\/products\/antlia-3nm-pro-nii-narrowband-2-filter-pro-3nm-n-2","provider":"All-Star Telescope Canada","version":"1.0","type":"link"}