{"product_id":"svbony-sv227-2-oiii-5nm-filter","title":"SVBONY SV227 2″ OIII 5nm Narrowband Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397656908010027322728.jpg?v=1791670055\" alt=\"SVBONY SV227 2 inch OIII 5nm filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV227 OIII is a 2″ narrowband imaging filter with a 5 nm passband centred on the 500.7 nm doubly ionised oxygen line. Peak transmission is at least 90%, blocking is ≥OD5 across 300–1000 nm, and SVBONY's spec table gives a 44 mm clear aperture. The 1.85 mm substrate sits in a CNC-machined, sand-blasted, black-anodised cell with an M48 x 0.75 thread, and SVBONY lists the net weight as 12.5 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397656964388004370122.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you image planetary nebulae, supernova remnants and emission nebulae with a monochrome camera, for HOO bicolour or full SHO, from a 2″ filter wheel or drawer.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 nm at 500.7 nm:\u003c\/strong\u003e isolates OIII emission and raises target-to-sky contrast under urban skies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e≥90% peak transmission\u003c\/strong\u003e and \u003cstrong\u003e≥OD5 blocking\u003c\/strong\u003e from 300 to 1000 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInfrared blocked:\u003c\/strong\u003e roughly 700–1100 nm is rejected, so no separate IR-cut filter is needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIon-assisted multi-coating\u003c\/strong\u003e on German glass for scratch resistance and wavelength stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal cell:\u003c\/strong\u003e CNC-machined, sand-blasted, black-anodised and laser-engraved.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397656994019817804039.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter narrowband passband panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397657031471537927564.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter coating panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eOIII emission sits close to the brightest part of the light-pollution spectrum, which is why a narrow passband matters most here. At 5 nm, with ≥OD5 rejection elsewhere, the filter records the 500.7 nm line with a dark background, and the deep blocking also removes the near infrared. Surface quality is 60\/40, with 1\/4λ surface parallelism and 30″ parallelism.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397657083559644945563.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter cell construction panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397657142521238069515.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter specification panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOIII imaging\u003c\/strong\u003e of planetary nebulae and supernova remnants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHOO and SHO imaging\u003c\/strong\u003e alongside H-alpha and SII filters.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDeep-sky imaging from light-polluted urban areas.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M48 x 0.75, single thread, standard 2″ size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHolders:\u003c\/strong\u003e 2″ filter wheels, filter drawer sliders and 2″ nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatching filters:\u003c\/strong\u003e SVBONY makes the SV227 2″ H-alpha and SII 5 nm filters and a 2″ SHO set.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397657172163324801402.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter compatibility panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal ratio:\u003c\/strong\u003e SVBONY lists it as unsuitable for telescopes faster than f\/4.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNot for solar use.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis listing is the filter only;\u003c\/strong\u003e SVBONY also offers it with a 2″ holder.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads into a 2″ filter wheel position, drawer slider or nosepiece like any standard M48 filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it a visual OIII filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is designed as an imaging filter; its 5 nm passband is narrower than typical visual OIII filters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need an IR-cut filter as well?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. The filter blocks the near infrared on its own.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″, 5 nm OIII filter at 500.7 nm with ≥90% peak transmission and ≥OD5 blocking, for nebula imaging at f\/4 and slower.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"OIII Filter","offer_id":67722307403887,"sku":"W9187DC","price":133.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9187DC-1_20251206142152_7716_20260810145223_4262.webp?v=1791670487","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv227-2-oiii-5nm-filter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}