{"product_id":"zwo-h-alpha-oiii-sii-7nm-narrowband-sho-filter-set","title":"ZWO 7nm Narrowband SHO Filters (Ha, OIII \u0026 SII)","description":"\u003ch2\u003eZWO 7nm SHO Narrowband Filters (Ha, OIII \u0026amp; SII)\u003c\/h2\u003e\n\u003cp\u003eThe ZWO SHO Narrowband Filter Set contains one H-alpha, one OIII and one SII filter. Use it for tricolor CCD astrophotography. Available in 1.25″ \u0026amp; 2″ round mounted sizes as well as 31mm \u0026amp; 36mm round unmounted sizes.\u003c\/p\u003e\n\u003cp\u003eThe ZWO H-alpha 7nm Narrowband Filter has a bandpass of  7nm and passes light at 656nm  wavelength, light transmission rate comes up to 90%. Best choice of narrowband H-alpha astrophotography filter for high-contrast imaging and revealing rich details of the nebula even in areas with strong light pollution, just prepare to experience the infinite fun with it!\u003c\/p\u003e\n\u003cp\u003eThe ZWO OIII 7nm Narrowband Filter is designed for nebula observation allowing the 7nm bandwidth of light centered on a wavelength of 500nm through,  which corresponds to OIII emission lines, blocking out all other light.  Adding the ZWO O-III Narrowband filter to your imaging collection will help you go beyond the RGB imaging and will help capture your favorite nebulas in a totally new light, no matter how polluted your skies may be!\u003c\/p\u003e\n\u003cp\u003eThe ZWO SII 7nm Narrowband Filter passes light at 672nm wavelength with a bandpass of 7nm which is designed for nebula observation. It is suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants, use it with H-alpha and OIII narrowband filters (SHO Set) for tricolor CCD astrophotography.\u003c\/p\u003e\n\u003cp\u003eNarrowband filter does not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/p\u003e\n\u003cp\u003eIt can reduce the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/0b7561e863701da396bce2092bc696ec.webp?v=1752870758\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch4\u003eNew vs Old Filters\u003c\/h4\u003e\n\u003cp\u003eNew Ha filter is based on the new base glass, less reflection( less halo of bright stars).\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003eWe made a test of our Ha Filters (ASI1600 mono camera, single frame, 300s, DDP in MaximDL) :\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/0c2508e6ce1e835958f976b9e417026a.webp?v=1752870720\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eNew OIII filter is based on the same base glass, new coating standard, better block rate of off-band.\u003c\/p\u003e\n\u003cp\u003eNew SII filter is based on the new base glass, less reflection( less halo of bright stars).\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7±0.5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.25″ Round Mounted\n\u003cp\u003e31mm Round Unmounted\u003c\/p\u003e\n\u003cp\u003e36mm Round Unmounted\u003c\/p\u003e\n\u003cp\u003e2″ Round Mounted\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGlass Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.0+\/-0.03 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePolishing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/4 wavefront over the both surfaces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmission\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAbout 90% at SII line 672nm\n\u003cp\u003e\u0026lt;0.1% transmission of off-band, OD3(Optical Density)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIR-Cut\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e700-1100nm cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eFilter\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCase\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/fr\/pages\/zwo-warranty?_pos=1\u0026amp;_psq=zwo+warranty\u0026amp;_ss=e\u0026amp;_v=1.0\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Years Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/zwo-guides-and-manuals\" rel=\"noopener\" target=\"_blank\"\u003eZWO General Product \u0026amp; Software Manuals\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ZWO-Narrowband-Filters-Transmission-Curves.pdf?v=1670868994\" target=\"_blank\"\u003eZWO Narrowband Filters Transmission Curves\u003c\/a\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Filter Set (SHO) \/ 1.25\" Mounted","offer_id":43760428515557,"sku":"ZWO-NB7nm1.25","price":517.0,"currency_code":"CAD","in_stock":true},{"title":"Filter Set (SHO) \/ 31mm Unmounted","offer_id":46386674696421,"sku":"ZWO-NB7nmD31","price":591.0,"currency_code":"CAD","in_stock":true},{"title":"Filter Set (SHO) \/ 36mm Unmounted","offer_id":43760428581093,"sku":"ZWO-NB7nmD36","price":671.0,"currency_code":"CAD","in_stock":true},{"title":"Filter Set (SHO) \/ 2\" Mounted","offer_id":43760428613861,"sku":"ZWO-NB7nmD2","price":979.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III \/ 1.25\" Mounted","offer_id":43760428646629,"sku":"ZWO-OIII7nm1.25","price":181.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III \/ 31mm Unmounted","offer_id":46386674729189,"sku":"ZWO-OIII7nmD31","price":207.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III \/ 36mm Unmounted","offer_id":43760428712165,"sku":"ZWO-OIII7nmD36","price":237.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III \/ 2\" Mounted","offer_id":43760428744933,"sku":"ZWO-OIII7nmD2","price":349.0,"currency_code":"CAD","in_stock":true},{"title":"H-Alpha \/ 1.25\" Mounted","offer_id":43760428777701,"sku":"ZWO-Ha7nm1.25","price":181.0,"currency_code":"CAD","in_stock":true},{"title":"H-Alpha \/ 31mm Unmounted","offer_id":46386674761957,"sku":"ZWO-Ha7nm31","price":203.0,"currency_code":"CAD","in_stock":true},{"title":"H-Alpha \/ 36mm Unmounted","offer_id":43760428843237,"sku":"ZWO-Ha7nmD36","price":237.0,"currency_code":"CAD","in_stock":true},{"title":"H-Alpha \/ 2\" Mounted","offer_id":43760428876005,"sku":"ZWO-Ha7nm2","price":349.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfur II \/ 1.25\" Mounted","offer_id":43760428908773,"sku":"ZWO-SII7nm1.25","price":181.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfur II \/ 31mm Unmounted","offer_id":46386674794725,"sku":"ZWO-SII7nm31","price":207.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfur II \/ 36mm Unmounted","offer_id":43760428974309,"sku":"ZWO-SII7nmD36","price":237.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfur II \/ 2\" Mounted","offer_id":43760429007077,"sku":"ZWO-SII7nm2","price":349.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/zwo-h-alpha-oiii-and-sii-7nm-narrowband-sho-filters-astronomy-plus-1_32f6c439-47b7-4af3-a15f-bedf87b1d1fe.jpg?v=1690484789","url":"https:\/\/istronomyplus.com\/products\/zwo-h-alpha-oiii-sii-7nm-narrowband-sho-filter-set","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}