{"product_id":"idas-gnb-galaxy-nebula-booster-filter","title":"IDAS GNB Galaxy \u0026 Nebula Booster Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual-bandpass design passes H-alpha, OIII, and Near-Infrared (NIR) wavelengths\u003c\/li\u003e\n\u003cli\u003eThe world's first filter for imaging both nebulae and galaxies\u003c\/li\u003e\n\u003cli\u003eAvailable in 6 formats including 2\" M48, M52, and drop-in styles for Canon, ZWO, and IDAS adapters\u003c\/li\u003e\n\u003cli\u003eDZ drop-in format features a 47mm effective aperture to reduce vignetting on full-frame sensors\u003c\/li\u003e\n\u003cli\u003eSubstrate thicknesses of 2.0mm for mounted filters and 1.1mm for select drop-in versions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eIDAS GNB Galaxy \u0026amp; Nebula Booster Filter\u003c\/h2\u003e\n\u003cp\u003eThe IDAS GNB Galaxy \u0026amp; Nebula Booster Filter transmits not only the H-alpha and OIII emission lines from nebulae but also a wide band of near-infrared (NIR) light useful for capturing galaxies. This dual-purpose design is available in 6 distinct formats, from standard 2-inch M48 threaded cells with a 2.0mm substrate thickness to the DZ drop-in version with its 47mm clear aperture. IDAS built it on the fact that the near-infrared region is hardly affected by artificial light pollution, so the GNB can record galaxies that conventional nebula filters cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Dual-Bandpass Design for Galaxies and Nebulae\u003c\/h3\u003e\n\u003cp\u003eTraditional light pollution and dual-band nebula filters work by isolating specific emission lines like H-alpha and Oxygen III while blocking everything else. While this is highly effective for emission nebulae, it aggressively cuts the broadband continuum emission from galaxies. The IDAS GNB filter solves this by creating a hybrid transmission profile: it suppresses visible-spectrum light pollution just like a nebula filter, but then opens a second window in the near-infrared, allowing the faint light from distant galaxies to reach your sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSensor Synergy: Performance with IMX585, IMX464, and Conventional Sensors\u003c\/h3\u003e\n\u003cp\u003eThe GNB filter's performance is closely tied to your camera's sensor technology. For imagers in heavily light-polluted areas, IDAS recommends pairing the GNB with a modern color sensor that has enhanced near-infrared sensitivity, such as the Sony IMX585 or IMX464.\u003c\/p\u003e\n\u003cp\u003eWhen used with a conventional one-shot-color sensor like the IMX294, the GNB filter still delivers valuable results by enhancing the overall colorfulness of galaxies. However, be aware that the strong NIR signal can sometimes desaturate the distinct colors of HII and OIII regions within a galaxy's spiral arms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUnderstanding Halos: An 8.0x Increase with Conventional Sensors\u003c\/h3\u003e\n\u003cp\u003eA trade-off when imaging in the near-infrared is the potential for halos around bright stars. The anti-reflection coatings on most camera optical windows and sensor cover glasses are optimized for the visible spectrum, not NIR. The IDAS GNB, by design, transmits these NIR wavelengths, which can lead to internal reflections that manifest as halos.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith IMX294 Sensor:\u003c\/strong\u003e Expect a halo magnitude roughly 8.0 times more pronounced than what is seen with a visible-spectrum-only filter like the IDAS NBZ.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith IMX585 Sensor:\u003c\/strong\u003e The effect is reduced but still present, with a halo magnitude approximately 6.3 times that of the NBZ filter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFilters using the infrared, such as the GNB and DTD, tend to show this, and halos from the camera side add to halos from the filter itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Format: 6 Mounts from M48 Thread-In to ZWO Drop-In\u003c\/h3\u003e\n\u003cp\u003eThe GNB comes in six formats. Drop-in adapters and filter drawers are sold separately.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" M48 \u0026amp; M52 Mounted:\u003c\/strong\u003e Threaded M48x0.75 (2\") and M52x0.75 cells with a 2.0mm substrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDS Drop-in:\u003c\/strong\u003e A 1.1mm thick filter designed exclusively for the IDAS AD42-DS drop-in adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDRT Drop-in:\u003c\/strong\u003e A framed filter with a 2.0mm substrate for Canon EF-EOS R, Meike MK-EFTR-C \/ MK-EFTE-C, and Kolari EF-EOS R drop-in mount adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDZ Drop-in:\u003c\/strong\u003e A framed filter with a 2.0mm substrate and a 47mm clear aperture, designed for ZWO FD-M54-II and FD-M42-II filter drawers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZF Drop-in:\u003c\/strong\u003e A 1.1mm thick filter that drops into the T-ring of ZWO M42-mount cameras with a 6.5mm flange back.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the IDAS GNB filter perform on a galaxy like M33 with an IMX294 camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen using the IDAS GNB with a conventional sensor like the IMX294 on a galaxy like the Triangulum Galaxy (M33), the filter enhances the overall colorfulness of the galaxy. However, the strong near-infrared signal passed by the filter may slightly desaturate the distinct red and blue-green colors of the HII and OIII regions within the galaxy's spiral arms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a ZWO camera with an FD-M54-II filter drawer. Which IDAS GNB format do I need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe DZ format is made for this. It replaces the standard filter holders in ZWO FD-M54-II and FD-M42-II filter drawers. It offers a larger 47mm clear aperture compared to standard M48 filters, which helps reduce vignetting on full-frame sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does my IDAS GNB filter produce halos around bright stars?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe halos are a known side effect of imaging in the near-infrared (NIR) spectrum. Most camera sensor windows have anti-reflection coatings optimized only for visible light. The GNB filter is designed to pass NIR light, which can cause internal reflections between the filter and the unoptimized camera glass, resulting in halos. This effect is more pronounced with conventional sensors (like the IMX294) than with NIR-enhanced sensors (like the IMX585).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the main difference between the IDAS GNB and a standard dual-band nebula filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard dual-band filter passes only specific visible wavelengths like H-alpha and OIII, blocking everything else. The IDAS GNB filter passes those same nebula lines but \u003cstrong\u003ealso passes a broad range of near-infrared (NIR) light\u003c\/strong\u003e. IDAS designed it this way so that galaxies can be imaged as well as nebulae, since the near-infrared region is hardly affected by artificial light pollution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a special camera to use the IDAS GNB filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, but results are optimized with certain sensors. IDAS recommends using the GNB filter with cameras that have enhanced near-infrared sensitivity, such as those with the Sony IMX585 or IMX464 sensors. It will still work with conventional color cameras (e.g., IMX294), but the NIR signal may alter the final color balance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow should I clean my IDAS GNB filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFollow this procedure:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor loose dust:\u003c\/strong\u003e Use a clean air blower to gently remove particles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor stubborn stains:\u003c\/strong\u003e After blowing off loose dust, use a lens cleaning paper wetted with a \u003cstrong\u003eneutral\u003c\/strong\u003e (not acidic or alkaline) lens cleaning fluid. Wipe gently and slowly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilicone-impregnated cloth:\u003c\/strong\u003e If using one, always blow dust off first, then wipe gently.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eIDAS (ICAS Enterprises, Japan)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating Type\u003c\/td\u003e\n\u003ctd\u003eInterference filter (spectrum shifts with light incidence angle)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\" (M48) Format\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 threaded cell with 2.0mm substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM52 Format\u003c\/td\u003e\n\u003ctd\u003eM52x0.75 threaded cell with 2.0mm substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDS Drop-in Format\u003c\/td\u003e\n\u003ctd\u003eFor IDAS AD42-DS adapter, 1.1mm substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDRT Drop-in Format\u003c\/td\u003e\n\u003ctd\u003eFor Canon EF-EOS R, Meike, and Kolari adapters, 2.0mm substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDZ Drop-in Format\u003c\/td\u003e\n\u003ctd\u003eFor ZWO FD-M54-II\/FD-M42-II drawers, 47mm aperture, 2.0mm substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eZF Drop-in Format\u003c\/td\u003e\n\u003ctd\u003eFor ZWO M42-mount cameras (6.5mm backfocus) \u0026amp; IDAS AD19.4 mount, 1.1mm substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eIDAS GNB Galaxy \u0026amp; Nebula Booster Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 (format chosen at checkout)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul style=\"list-style: none; padding-left: 0;\"\u003e\n\u003cli style=\"margin-bottom: 1em;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/idas-drt-drop-in-filter-manual.pdf\" target=\"_blank\"\u003eIDAS DRT Drop-in Filter Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 1em;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/idas-dz-drop-in-filter-manual.pdf\" target=\"_blank\"\u003eIDAS DZ Drop-in Filter Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 1em;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/idas-zf-filter-manual.pdf\" target=\"_blank\"\u003eIDAS ZF Filter Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 1em;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/idas-ad42-ds-drop-in-adapter-manual.pdf\" target=\"_blank\"\u003eIDAS AD42-DS Drop-in Adapter Manual (for DS filters)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 1em;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/idas-filter-cleaning-procedure.pdf\" target=\"_blank\"\u003eIDAS Filter Cleaning Procedure\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eContact us for warranty details.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IDAS","offers":[{"title":"2\" (M48) mounted","offer_id":68030080516381,"sku":"IDA-GNB-48ST2","price":347.0,"currency_code":"CAD","in_stock":true},{"title":"M52 mounted","offer_id":68030080549149,"sku":"IDA-GNB-52ST2","price":417.0,"currency_code":"CAD","in_stock":true},{"title":"DS drop-in (IDAS AD42-DS)","offer_id":68030080581917,"sku":"IDA-GNB-DS","price":417.0,"currency_code":"CAD","in_stock":true},{"title":"DRT drop-in (Canon EF-EOS R)","offer_id":68030080614685,"sku":"IDA-GNB-DRT","price":459.0,"currency_code":"CAD","in_stock":true},{"title":"DZ drop-in (ZWO FD-M54-II)","offer_id":68030080647453,"sku":"IDA-GNB-DZ","price":409.0,"currency_code":"CAD","in_stock":true},{"title":"ZF (ZWO cameras)","offer_id":68030080680221,"sku":"IDA-GNB-ZF","price":316.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/idas-gnb-galaxy-nebula-booster-filter-1.png?v=1794332106","url":"https:\/\/davidastro.com\/products\/idas-gnb-galaxy-nebula-booster-filter","provider":"David Astro","version":"1.0","type":"link"}