{"product_id":"idas-ngs1-lps-d3-night-glow-suppression-light-pollution-filter","title":"IDAS NGS1 (LPS-D3) Night Glow Suppression Light Pollution Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSuppresses natural night glow emissions, including Oxygen (OI) at 557.7nm, 630.0nm, and 636.4nm\u003c\/li\u003e\n\u003cli\u003eBlocks common man-made light pollution from LED, high-pressure, and low-pressure sodium lamps\u003c\/li\u003e\n\u003cli\u003eMaintains high transmission for key deep-sky targets like emission nebulae and comets\u003c\/li\u003e\n\u003cli\u003ePassband deliberately shifted toward longer wavelengths so nebular lines stay inside it at incidence angles up to about 14°\u003c\/li\u003e\n\u003cli\u003eFeatures durable IGAD (Ion-Gun Assist Deposition) coatings for long-term spectral stability\u003c\/li\u003e\n\u003cli\u003eAvailable in 7 formats, including 2\" threaded and drop-in options for Canon, ZWO, and RASA 8 systems\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 NGS1 (LPS-D3) Night Glow Suppression Light Pollution Filter\u003c\/h2\u003e\n\u003cp\u003eThe NGS1 (LPS-D3) is the world's first filter designed to suppress both man-made light pollution and natural atmospheric night glow. It specifically targets emissions from atmospheric Oxygen (OI) at 557.7nm and Sodium (NaI) at 589.0nm and 589.6nm. It also keeps suppression of high- and low-pressure sodium lamps and modern white LED lighting, maximizing signal from emission nebulae and comets even under compromised skies.\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\u003eTargeting 557.7nm OI: Suppressing Natural Night Glow \u0026amp; Man-Made LEDs\u003c\/h3\u003e\n\u003cp\u003eUnlike traditional light pollution filters that only address artificial lighting, the NGS1 tackles a more persistent problem: natural airglow. This faint, ever-present light is produced by the Earth's own atmosphere, primarily from excited Oxygen (OI at 557.7nm, 630.0nm, 636.4nm) and Sodium (NaI at 589.0nm, 589.6nm). The NGS1 bandpass also blocks these specific wavelengths, on top of the man-made light pollution that conventional filters address.\u003c\/p\u003e\n\u003cp\u003eWhile pioneering this new level of suppression, the NGS1 retains the capabilities of IDAS's conventional LPS filters. It effectively blocks common light pollution sources and passes the main emission lines from deep-sky objects. It passes the light of emission nebulae, the C2 comae of comet heads, and the CO+ ionized tails of comets.\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\u003eOptimized for Fast Optics: Full Transmission with Incidence Angles Below 14°\u003c\/h3\u003e\n\u003cp\u003eInterference filters are notoriously sensitive to the angle of incoming light, which can cause the filter's bandpass to shift toward shorter wavelengths and reduce transmission of your target's signal. This is a significant problem in fast, wide-field systems like astrographs and camera lenses. The IDAS NGS1 is specifically designed to counteract this effect.\u003c\/p\u003e\n\u003cp\u003eThe filter's transmission range is intentionally shifted toward longer wavelengths, creating a margin that maintains performance even with highly oblique light rays. The NGS1 passes almost all of these nebular emission lines when the incidence of the light is kept below 14 degrees. Placed in front of a lens, use a lens whose light incidence angle is 14 degrees or lower (field angle of 34 degrees or lower). Placed between the lens and an APS-C camera, a lens with a back focal distance of 40mm or more at f\/2 keeps the averaged incidence angle within about 14 degrees; lenses with a small rear element can exceed it at the edges of the frame.\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\u003eIGAD Coating Technology: Quartz-Hard Durability and Spectral Stability\u003c\/h3\u003e\n\u003cp\u003eAt the core of the NGS1 filter is IDAS's proprietary IGAD (Ion-Gun Assist Deposition) coating technology. This process creates multi-layer coatings that are far more dense and robust than those from conventional methods.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness and Adherence:\u003c\/strong\u003e The IGAD layers have a hardness equal to quartz glass and a much stronger bond between the substrate and the multi-layer stack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental Stability:\u003c\/strong\u003e The spectral characteristics show almost no aging from temperature and humidity changes in normal living environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e7 Formats for Every System: From 2\" Threaded to ZWO and Canon Drop-In\u003c\/h3\u003e\n\u003cp\u003eThe NGS1 comes in seven formats. Drop-in adapters and filter drawers are sold separately.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" (M48) and 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 For the IDAS AD42-DS drop-in mount adapter system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDi2 Drop-in:\u003c\/strong\u003e Exclusively for the IDAS AD19.4 drop-in adapter used with Celestron RASA 8 astrographs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDRT Drop-in:\u003c\/strong\u003e Designed for the Canon EF-EOS R drop-in mount adapter, as well as compatible adapters from Meike and Kolari.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDZ Drop-in:\u003c\/strong\u003e A frame for ZWO's FD-M54-II and FD-M42-II filter drawers. It features a larger 47mm clear aperture to reduce vignetting on full-frame sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZF:\u003c\/strong\u003e Drops into the T-ring of ZWO M42 male-mount cameras with a 6.5mm flange back, and also fits the IDAS AD19.4 drop-in mount.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the IDAS NGS1 filter different from other light pollution filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe IDAS NGS1 is the first filter of its kind designed to suppress \u003cstrong\u003eboth man-made light pollution and natural atmospheric night glow\u003c\/strong\u003e. While standard LPS filters target sodium and mercury vapor lamps, the NGS1 adds specific blocking for atmospheric Oxygen (OI) and Sodium (NaI) emission lines, for green, orange and red night glow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the IDAS NGS1 with my fast f\/2 RASA or telephoto lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The IDAS NGS1 is designed for fast optical systems. Its passband is shifted toward longer wavelengths so it passes almost all nebular emission lines when the light's incidence angle stays below 14 degrees. For the RASA 8, the Di2 format drops into the IDAS AD19.4 adapter. With camera lenses, follow the 14-degree incidence guideline in the description.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich IDAS NGS1 format do I need for my ZWO camera and filter drawer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou have two primary options for ZWO setups:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDZ Drop-in:\u003c\/strong\u003e This format is designed for the ZWO FD-M54-II or FD-M42-II filter drawers. It offers a larger 47mm clear aperture to minimize vignetting with full-frame sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZF Filter:\u003c\/strong\u003e This filter drops directly into the T-ring of ZWO cameras that have an M42 male mount and 6.5mm flange back distance, providing a filter solution without needing a separate drawer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the IDAS NGS1 block light from modern LED streetlights?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The IDAS NGS1 is designed as a successor to conventional light pollution filters and suppresses interference from white LED lighting, in addition to traditional high- and low-pressure sodium lamps.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the IDAS NGS1 improve images of comets?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the filter is designed to pass the light of comets. It passes wavelengths corresponding to the C2 comae (the comet's head) and the CO+ ionized tails, while simultaneously suppressing the sky background from both light pollution and natural airglow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I clean my IDAS NGS1 filter without damaging the coatings?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, use an air blower to remove any loose dust or gritty particles. If stains remain, apply a neutral lens cleaning liquid to a lens cleaning paper and wipe gently. Do not use acidic or alkaline cleaners.\u003c\/p\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 (spectral characteristics depend on the angle of incoming light)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Formats \u0026amp; Thickness\u003c\/td\u003e\n\u003ctd\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003e2\" (M48) Mounted:\u003c\/b\u003e M48x0.75 threaded cell, 2.0mm substrate\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eM52 Mounted:\u003c\/b\u003e M52x0.75 threaded cell, 2.0mm substrate\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDS Drop-in:\u003c\/b\u003e For IDAS AD42-DS adapter, 1.1mm substrate\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDi2 Drop-in:\u003c\/b\u003e For IDAS AD19.4 adapter (RASA 8), 2.0mm substrate\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDRT Drop-in:\u003c\/b\u003e For Canon EF-EOS R \u0026amp; compatible adapters, 2.0mm substrate\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDZ Drop-in:\u003c\/b\u003e For ZWO FD-M54-II\/FD-M42-II drawers, 47mm aperture, 2.0mm substrate\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eZF (ZWO Cameras):\u003c\/b\u003e For ZWO M42 cameras (6.5mm backfocus), 1.1mm substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\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 NGS1 (LPS-D3) Night Glow Suppression Light Pollution 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-ad19-4-adapter-rasa8-manual.pdf\" target=\"_blank\"\u003eIDAS AD19.4 Adapter for RASA 8 Manual (for Di2 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-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":68030069506333,"sku":"IDA-NGS1-48ST2","price":245.0,"currency_code":"CAD","in_stock":true},{"title":"M52 mounted","offer_id":68030069539101,"sku":"IDA-NGS1-52ST2","price":277.0,"currency_code":"CAD","in_stock":true},{"title":"DS drop-in (IDAS AD42-DS)","offer_id":68030069571869,"sku":"IDA-NGS1-DS","price":297.0,"currency_code":"CAD","in_stock":true},{"title":"Di2 drop-in (IDAS AD19.4 \/ RASA 8)","offer_id":68030069604637,"sku":"IDA-NGS1-Di2","price":347.0,"currency_code":"CAD","in_stock":true},{"title":"DRT drop-in (Canon EF-EOS R)","offer_id":68030069637405,"sku":"IDA-NGS1-DRT","price":347.0,"currency_code":"CAD","in_stock":true},{"title":"DZ drop-in (ZWO FD-M54-II)","offer_id":68030069670173,"sku":"IDA-NGS1-DZ","price":297.0,"currency_code":"CAD","in_stock":true},{"title":"ZF (ZWO cameras)","offer_id":68030069702941,"sku":"IDA-NGS1-ZF","price":245.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/idas-ngs1-lps-d3-night-glow-suppression-light-pollution-filter-1.jpg?v=1794332105","url":"https:\/\/davidastro.com\/products\/idas-ngs1-lps-d3-night-glow-suppression-light-pollution-filter","provider":"David Astro","version":"1.0","type":"link"}