{"product_id":"o-iii-super-g-filter-9nm-cmos-optimized-2","title":"O-III Super-G Filter (9nm)- CMOS optimized - 2\"","description":"\u003cul\u003e\n\u003cli\u003eO-III Super-G filter with 9 nm FWHM and a maximum transmission of 97%.\u003cbr\u003eFor visual and photographic observation of planetary nebulae and supernova remnants, even with small telescopes\u003c\/li\u003e\n\u003cli\u003eCan be used as a \"Super-G filter\" replacement for RGB photography. While regular G-filters suffer from bad seeing due to air turbulences, the narrow range of 9 nm passes less thermal noise, i.e. sharper images. Nevertheless, the transmission window is large enough not to be considered a pure narrowband filter.\u003c\/li\u003e\n\u003cli\u003eCMOS-optimized coating technology with much steeper slopes of the filter passband- for increased contrast, longer life and to avoid reflections.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBaader O-III Super-G Filter, 1.25\" and 2\"\u003c\/h2\u003e\n\u003cp\u003eThe new Baader O-III filter is designed for deep sky visual observing and photographing those gas nebulae in which doubly ionized oxygen fluoresces. It is superb for for planetary nebulae, supernova remnants, and many large emission nebula. With a FWHM of only 9 nm and equipped with the CMOS-optimized coating technology, it darkens the sky background, blocking stray light much better than its 10 nm predecessor (Baader (10nm) O-III Filter visual) for outstanding visual contrast on a large number of nebula. But the narrower FWHM is not the most important improvement. More important is the significantly better blocking aside of the O-III wavelength, as well as even steeper transmission slopes and a broad plateau in the transmission range. With a transmission of 97% for the emission line at 500.7 nm, practically all the light of the nebula passes through the filter. At the same time, this filter can be used photographically for practically any focal ratio from f\/1.8 to f\/12 without passing any light of the H-beta line. This makes the Super-G filter just as ideal for use in areas with high light pollution.\u003c\/p\u003e\n\u003ch3\u003ePhotographic use\u003c\/h3\u003e\n\u003cp\u003eThe 9 nm O-III filter can be excellently used photographically on all telescopes, especially with a DSLR or an astronomical OSC colour camera. It offers all the advantages of the CMOS-optimized Baader filters such as Reflex-BlockerTM coating against reflections, plano-optical polishing and age-resistant Life-Coat™ coating. For monochrome cameras, we recommend the even stronger Narrowband (6,5 nm) and Ultra-Narrowband (4 nm) filters, which are available specially adapted for different aperture ratios. For this comparatively broadband 9 nm filter, pre-shifting is not necessary at focal ratios faster than f\/4, thus it can be used at all focal ratios.\u003c\/p\u003e\n\u003ch3\u003eSuper-G filter\u003c\/h3\u003e\n\u003cp\u003eThe filter has the same thickness as the 1.25\"\/2\" Baader LRGB filters. This makes it suitable for use as a \"super G filter\": In the transmission range of the normal green filter (490-580nm) there are no emission lines other than OIII; H-Beta at 486 nm is already covered by the RGB blue filter. So, when using the 9 nm O-III filter instead of the standard RGB green filter, emission nebulae are consequently emphasised much more strongly, while the stars appear fainter.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eThe Baader O-III Super-G Filter (9nm) also offers all the advantages of the CMOS-optimized Baader filters:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncreased contrast, matched for typical CMOS quantum efficiency and s\/n ratio\u003c\/li\u003e\n\u003cli\u003eReflex-BlockerTM coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics\u003c\/li\u003e\n\u003cli\u003eIdentical filter thickness to existing standards, with utmost care for parfocality\u003c\/li\u003e\n\u003cli\u003eBlackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter\u003c\/li\u003e\n\u003cli\u003eEach filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)\u003c\/li\u003e\n\u003cli\u003eLife-Coat™: evermore hard coatings to enable a non-aging coating for life- even in a most adverse environment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"data-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eMANUFACTURER\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eSKU (#)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2961551\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eEAN CODE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e4047825048189\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eNET WEIGHT (KG)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.012\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eTRANSMISSION RANGE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eO-III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER THICKNESS (WITHOUT CELL)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eHBW (HALFBANDWIDTH)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e9nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eCWL (CENTRAL WAVELENGTH)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e502 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eAR-COATING\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eReflex-BlockerTM hard coated, dielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER SIZE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER USAGE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eCMOS, Contrast Enhancement, O-III, Planetary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER MOUNTED\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eTYPE OF FILTER\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNarrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eSINGLE OR SET?\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER SHAPE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":50382418280705,"sku":"FOIIISG-2","price":200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/OIII_SG_B.webp?v=1790194607","url":"https:\/\/starizona.com\/products\/o-iii-super-g-filter-9nm-cmos-optimized-2","provider":"Starizona","version":"1.0","type":"link"}