{"product_id":"antlia-h-beta-and-oiii-filter-1-25","title":"Antlia H-beta and OIII Filter 1.25″","description":"\u003ch2 data-mce-fragment=\"1\"\u003eAntlia H-beta and OIII Filter – 1.25″\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia HB-OIII filter is engineered specifically for night visual nebulae observation at a high contrast and Deep-sky astrophotography. Its transmission is 90% or greater at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice much higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by Antlia HB-OIII filter.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWhen it is used for Astro Deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eMain Application and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia HB-OIII filter was coated with almost total suppression of optical density (OD)4 on unwanted wavelength and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region, compared with the visual filters with a cut-off depth of OD3@350-750nm, it performs better to darken the sky background and make deep-sky observation and photography of nebulae, star clusters, and galaxies more easily.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe HB-OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-polluted and dark skies.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSince human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer’s eyes.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable cellspacing=\"0\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003e\u003c\/td\u003e\n\u003ctd width=\"174\" valign=\"top\"\u003eOxygen III\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003eOxygen III\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003eH-Beta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd width=\"174\" valign=\"top\"\u003e500.7nm\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e495.9nm\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e486.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd width=\"174\" valign=\"top\"\u003e＞90%\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e＞90%\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e＞90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eBlocking\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eOD4@ 300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eBasic Substrate\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eOptical, Single, Non-glued substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eSurface Quality\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eLambda\/4 or better\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eParallelism\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eless than 30 arcsec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty Against Delamination\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43628340019429,"sku":"AF-HB-OIII125","price":140.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-h-beta-and-oiii-filter-1-25-astronomy-plus-1.webp?v=1690488414","url":"https:\/\/istronomyplus.com\/products\/antlia-h-beta-and-oiii-filter-1-25","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}