{"title":"Filtres anti-pollution lumineuse","description":"\u003cdiv\u003e\n  \u003cp\u003e\n    Light pollution filters have become a more complicated recommendation than they were twenty years ago. Against the old sodium and mercury street lighting they worked remarkably well; against broad-spectrum LED there is no narrow band left to reject. David Astro carries light pollution filters in Canada from Canadian stock, and we will tell you plainly what one will and will not do at your site.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    The honest summary is that these filters help substantially on emission nebulae and very little on galaxies and star clusters. Tell us your targets and local lighting and we will give you a realistic expectation.\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- more --\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eWhat Light Pollution Filters Can and Cannot Do\u003c\/h2\u003e\n  \u003cp\u003e\n    A filter removes wavelengths. It works when the unwanted light occupies a different part of the spectrum from the light you want, and fails when they overlap.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBroadband city light filters:\u003c\/strong\u003e Reject mercury and sodium emission lines while passing most of the visible spectrum. Effective under older street lighting, much less so under LED.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUHC-type filters:\u003c\/strong\u003e Pass a narrower band containing the main nebula emission lines. Strong contrast gain on emission nebulae regardless of the lighting type causing the skyglow.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOIII filters:\u003c\/strong\u003e Very narrow, dramatic on planetary nebulae and supernova remnants, and dim enough to want substantial aperture behind them.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDual-band imaging filters:\u003c\/strong\u003e Pass Ha and OIII together for one-shot colour cameras, which is the most effective light pollution strategy currently available for imagers.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWhat they do not help:\u003c\/strong\u003e Galaxies, star clusters and reflection nebulae emit across the spectrum. A narrow filter removes their light along with the skyglow.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLED lighting reality:\u003c\/strong\u003e Broad-spectrum white LED leaves no gap to filter, which is why narrowband and dual-band approaches have largely replaced broadband filters for imaging.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eWhy Choose David Astro for Light Pollution Filters\u003c\/h2\u003e\n  \u003cp\u003e\n    We would rather tell you a filter will not help than sell you one that disappoints.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHonest about LED:\u003c\/strong\u003e If your local lighting has converted to LED, we will say that a broadband filter will do little and point you toward narrowband or dual-band instead.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTarget-based advice:\u003c\/strong\u003e Galaxies and clusters do not benefit. We will tell you that before you buy rather than let you discover it under the sky.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAperture matched:\u003c\/strong\u003e Narrower filters need more aperture to remain useful visually, and we size the recommendation to your telescope.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAuthorized dealer:\u003c\/strong\u003e Genuine filters with verified coatings and manufacturer warranty, in Canadian stock.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eShips from Canada:\u003c\/strong\u003e No duties or brokerage fees for Canadian buyers.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eLight Pollution Filters in Canada — Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003e\u003cstrong\u003eWill a light pollution filter help under LED streetlights?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eA broadband one, very little — LED emits across the visible spectrum with no narrow band to reject. A UHC or narrowband filter still works well on emission nebulae because it passes only specific emission lines.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eDo these filters help with galaxies?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eEssentially no. Galaxy light is broadband, so a filter removes it in the same proportion as the skyglow. Darker skies are the only real answer for galaxies.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eWhich filter for visual use in a city?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eA UHC-type filter gives the best contrast gain across the widest range of emission targets, and is a better first purchase than a narrower OIII for most apertures.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eWhat about imaging from a bright site?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eUse dual-band or narrowband filters rather than broadband light pollution filters. They isolate the emission lines and reject nearly everything else, which is far more effective.\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eImaging under city skies?\u003c\/h2\u003e\n  \u003cp\u003eTell us your targets and your local lighting and we will recommend honestly. In Canadian stock, shipped worldwide.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"celestron-uhc-lpr-filter-1-25","title":"Celestron Filtre UHC \/ LPR - 1.25\"","description":"\u003c!-- more --\u003e\u003ch2\u003e Caractéristiques\u003c\/h2\u003e\n\u003cul\u003e\u003cli\u003e Nos filtres de réduction de la pollution lumineuse (LPR) de 1-1\/4\" sont conçus pour réduire sélectivement la transmission de certaines longueurs d'onde de lumière, en particulier celles produites par la lumière artificielle\u003c\/li\u003e\u003c\/ul\u003e\n\u003ch2\u003e Filtre Celestron UHC\/LPR - 1,25 po\u003c\/h2\u003e \u003cp\u003eNos filtres de réduction de la pollution lumineuse (LPR) de 1-1\/4\" sont conçus pour réduire sélectivement la transmission de certaines longueurs d'onde de lumière, en particulier celles produites par la lumière artificielle. Cela inclut la vapeur de mercure, les lampes à vapeur de sodium haute et basse pression et le la lumière naturelle indésirable causée par l'émission d'oxygène neutre dans notre atmosphère (c'est-à-dire la lueur du ciel).\u003c\/p\u003e\n\u003cp\u003e Le filtre LPR à contraste ultra élevé (UHC) a amélioré le contraste par rapport aux filtres à large bande typiques. Le fond du ciel est plus sombre et le contraste des nébuleuses à émission est sensiblement amélioré. Les revêtements de technologie avancée permettent au filtre d'atteindre une transmission exceptionnelle de plus de 97% sur l'ensemble de la bande passante, avec un blocage total des lignes de pollution lumineuse importantes. Le filtre parfait pour visualiser la nébuleuse à partir d'un ciel légèrement pollué, ou pour augmenter le contraste de la nébuleuse à partir de sites de ciel sombre.\u003c\/p\u003e \u003cp\u003eEn plus de ses caractéristiques spectrales et optiques optimales, le filtre UHC\/LPR offre des caractéristiques importantes qui le distinguent et se traduisent par des vues célestes de la plus haute qualité :\u003c\/p\u003e\n\u003cp\u003e Les revêtements diélectriques multicouches sont assistés par plasma et durcis par faisceau d'ions en utilisant la dernière technologie pour la durabilité et la résistance aux rayures.\u003c\/p\u003e\n\u003cp\u003e Une transmission améliorée se traduit par une luminosité et un contraste d'image maximum. Les utilisateurs de télescopes plus petits, de 4\" à 11\", apprécieront particulièrement la haute efficacité, et les utilisateurs de plus grande portée adoreront les champs d'étoiles riches et les ombres nébulaires subtiles détaillées qui sont laissées intactes.\u003c\/p\u003e\n\u003cp\u003e La transmission élevée, les coupures nettes et la bande passante plus modérée de 60 nm du filtre UHC\/LPR conservent une vue plus naturelle, tout en augmentant considérablement le contraste global. Les imageurs apprécieront la bande passante plus large et l'inclusion d'une bande passante H-Alpha extrêmement efficace (656 nm).\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967149404445,"sku":"CEL-94123","price":132.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-UHC-LPR-Filter-1-25-in-94123-1__39582.1594230266.1280.1280.jpg?v=1684337240"},{"product_id":"celestron-uhc-lpr-filter-2","title":"Celestron Filtre UHC \/ LPR - 2\"","description":"\u003c!-- more --\u003e\u003ch2\u003e Caractéristiques\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eNos filtres de réduction de la pollution lumineuse (LPR) de 5,1 cm sont conçus pour réduire sélectivement la transmission de certaines longueurs d'onde de lumière, en particulier celles produites par la lumière artificielle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e Filtre Celestron UHC\/LPR - 2 po\u003c\/h2\u003e\n\u003cp\u003e Nos filtres de réduction de la pollution lumineuse (LPR) de 5,1 cm sont conçus pour réduire sélectivement la transmission de certaines longueurs d'onde de lumière, en particulier celles produites par la lumière artificielle. Cela comprend la vapeur de mercure, les lampes à vapeur de sodium haute et basse pression et la lumière naturelle indésirable causée. par l'émission d'oxygène neutre dans notre atmosphère (c'est-à-dire la lueur du ciel).\u003c\/p\u003e \u003cp\u003eLe filtre LPR à contraste ultra élevé (UHC) a amélioré le contraste par rapport aux filtres à large bande typiques. Le fond du ciel est plus sombre et le contraste des nébuleuses à émission est sensiblement amélioré. Les revêtements de technologie avancée permettent au filtre d'atteindre une transmission exceptionnelle de plus de 97% sur l'ensemble de la bande passante, avec un blocage total des lignes de pollution lumineuse importantes. Le filtre parfait pour visualiser la nébuleuse à partir d'un ciel légèrement pollué, ou pour augmenter le contraste de la nébuleuse à partir de sites de ciel sombre.\u003c\/p\u003e\n\u003cp\u003e En plus de ses caractéristiques spectrales et optiques optimales, le filtre UHC\/LPR offre des caractéristiques importantes qui le distinguent et se traduisent par des vues célestes de la plus haute qualité :\u003c\/p\u003e\n\u003cp\u003e Les revêtements diélectriques multicouches sont assistés par plasma et durcis par faisceau d'ions en utilisant la dernière technologie pour la durabilité et la résistance aux rayures.\u003c\/p\u003e \u003cp\u003eUne transmission améliorée se traduit par une luminosité et un contraste d'image maximum. Les utilisateurs de télescopes plus petits, de 4\" à 11\", apprécieront particulièrement la haute efficacité, et les utilisateurs de plus grande portée adoreront les champs d'étoiles riches et les ombres nébulaires subtiles détaillées qui sont laissées intactes.\u003c\/p\u003e\n\u003cp\u003e La transmission élevée, les coupures nettes et la bande passante plus modérée de 60 nm du filtre UHC\/LPR conservent une vue plus naturelle, tout en augmentant considérablement le contraste global. Les imageurs apprécieront la bande passante plus large et l'inclusion d'une bande passante H-Alpha extrêmement efficace (656 nm).\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967149437213,"sku":"CEL-94124","price":174.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-UHC-LPR-Filter-2-in-94124-1__66083.1594230267.1280.1280.jpg?v=1684337242"},{"product_id":"william-optics-stc-ultra-layer-astro-multispectra-filter-48mm","title":"William Optics Filtre Multispectre STC Ultra Layer Astro - 48mm","description":"\u003cul\u003e\n\n\u003cli\u003e\n\nFiltre passe-bande multi pour l'astrophotographie\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Conception filetée de 48 mm pour une fixation facile \n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\n\u003cli class=\"active\"\u003e Description \u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003cul class=\"tabs-content\"\u003e\n\n\u003cli class=\"active\"\u003e\n\n\u003cp\u003e\n Le filtre William Optics STC Ultra Layer Astro Multispectra est un filtre d'astrophotographie polyvalent conçu pour améliorer la capture de divers objets du ciel profond. Ce filtre multi-bande permet la transmission de longueurs d'onde spécifiques associées aux émissions nébulaires courantes tout en réduisant la pollution lumineuse et la lueur du ciel. \n\u003c\/p\u003e\n\n\u003cdiv class=\"warning\"\u003e\n\n\u003cimg alt=\"Clause de non-responsabilité\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/warning-logo.svg?v=1714663206\" width=\"25px\"\u003e\n\u003cp\u003e \nConçu principalement pour l'astrophotographie. Peut ne pas convenir à l'observation visuelle. Assurez-vous de la compatibilité avec la configuration de votre caméra et de votre télescope avant d'acheter.\n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv\u003e\n\n\u003ch3\u003e\n\n Conception du filtre \n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cdiv class=\"two-columns-section\"\u003e\n\n\u003cdiv class=\"text-side-2\"\u003e\n\n\u003cp\u003e\n Dispose d'une conception de revêtement multicouche sophistiquée qui permet la transmission de plusieurs raies d'émission importantes, notamment H-alpha, H-beta, OIII et SII. Cette configuration multi-bande-passe permet la capture de différents types de nébuleuses et autres objets du ciel profond en une seule exposition. \n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"image-side-2\" data-mce-style=\"text-align: start;\" style=\"text-align: start;\"\u003e\n\n\u003cimg alt=\"Filtre multispectra Astro Ultra Layer STC William Optics - vue de face de 48 mm\" src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/William-Optics-STC-Ultra-Layer-Astro-Multispectra-Filter-48mm-YF-STC-M48-1__78203.1596133266.1280.1280_832x832.jpg?v=1684339482\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv data-mce-style=\"backgroundcolor: #0a0001; border-radius: 5px;\" style=\"background-color: #0a0001; border-radius: 5px;\"\u003e\n\n\u003ch3 style=\"color: white!important;\"\u003e\n\n Performance \n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cdiv class=\"two-columns-section\"\u003e\n\n\u003cdiv class=\"image-side-2\" data-mce-style=\"text-align: start;\" style=\"text-align: start;\"\u003e\n\n\u003cimg alt=\"Filtre multispectra Astro Ultra Layer STC William Optics - 48 mm en étui\" src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/William-Optics-STC-Ultra-Layer-Astro-Multispectra-Filter-48mm-YF-STC-M48-3__22596.1596133266.1280.1280_832x832.jpg?v=1684339482\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"text-side-2\"\u003e\n\n\u003cp style=\"color: white!important;\"\u003e\n Fournit une excellente transmission de la lumière dans les bandes passantes spécifiées tout en bloquant efficacement les longueurs d'onde indésirables. Il en résulte des images très contrastées avec des effets de pollution lumineuse réduits, permettant des captures plus claires et plus détaillées de divers objets du ciel profond.\n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003ch3\u003e Applications:\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e \nIdéal pour photographier un large éventail d'objets du ciel profond, notamment les nébuleuses en émission, les nébuleuses planétaires et les restes de supernova. La conception multi-bande-passe permet de capturer simultanément plusieurs types d’émissions, fournissant ainsi une représentation complète des structures célestes.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Construction\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Fabriqué avec du verre optique de haute qualité et des revêtements multicouches de précision pour garantir une durabilité et des performances optimales. Le filtre est logé dans un cadre métallique robuste pour protéger les surfaces optiques délicates et faciliter une manipulation et une installation faciles.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Compatibilité\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Dispose d'une conception filetée de 48 mm, ce qui le rend compatible avec de nombreux télescopes, objectifs d'appareil photo et configurations d'imagerie acceptant les filtres de 48 mm. Cette taille est particulièrement courante dans les configurations d'astrophotographie, offrant une polyvalence dans différentes configurations d'équipement.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Efficacité de l'imagerie\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e \nEn transmettant sélectivement des raies d'émission importantes tout en bloquant la pollution lumineuse, ce filtre permet un meilleur rapport signal\/bruit et des temps d'exposition potentiellement plus courts, en particulier sous un ciel pollué par la lumière. Cela peut conduire à des séances d’imagerie plus efficaces et à la possibilité de capturer plus de cibles en une seule nuit.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Polyvalence\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n La nature multi-bande-passe de ce filtre en fait un choix polyvalent pour diverses cibles du ciel profond. Il peut être utilisé efficacement avec des caméras monochromes et couleur, offrant une flexibilité dans les techniques d'imagerie et les options de post-traitement.\n\u003c\/p\u003e\n\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967226573085,"sku":"WO-YF-STC-M48","price":328.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-STC-Ultra-Layer-Astro-Multispectra-Filter-48mm-YF-STC-M48-1__78203.1596133266.1280.1280.jpg?v=1684339482"},{"product_id":"chroma-loglow-filter","title":"Chroma Filtre LoGlow","description":"\u003c!-- more --\u003e\u003cp\u003e Bloque les lignes spectrales communes des sources d'éclairage. Ce filtre fournit une couleur équilibrée pour le spectre visible tout en bloquant la plupart des émissions des sources de lampes aux halogénures métalliques et à vapeur qui, ensemble, contribuent à la lueur du ciel.\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eFiltres conçus pour être utilisés avec CCD et pour f\/4.0 ou moins\u003c\/li\u003e\n\n\u003cli\u003ePas de reflets entraînant des distorsions d'image ou des \"réflexions arrière\"\u003c\/li\u003e\n\n\u003cli\u003eFront d'onde transmis supérieur à 0,25 onde\/pouce\u003c\/li\u003e\n\n\u003cli\u003eRevêtements de pulvérisation durables\u003c\/li\u003e\n\n \u003cli\u003eParallélisme : \u0026lt; 30 secondes d'arc\u003c\/li\u003e\n\n\u003cli\u003eLes revêtements extrêmement durables résistent aux changements d'humidité et aux flux de température extrêmes et restent spectralement précis\u003c\/li\u003e\n\n\u003cli\u003een adhérence CWL et passe-bande\u003c\/li\u003e\n\n\u003cli\u003eCapable de fabriquer de grands filtres pour de grands détecteurs : 50 mm x 50 mm, 65 mm jusqu'à 76,2 mm et carré de 101,6 mm\u003c\/li\u003e\n\n\u003cli\u003eTous les filtres fabriqués au Vermont\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003eChroma fabrique des filtres d'astronomie de la plus haute qualité avec des revêtements durs pulvérisés durables utilisant des substrats uniques du meilleur verre, éliminant ainsi le besoin de stratifications. Tous les revêtements de filtre primaires sont appliqués sur la surface avant et les revêtements anti-reflets sur la surface arrière pour éviter les images fantômes et maximiser la transmission.\u003c\/p\u003e \u003cp\u003eTrès précis et exacts, les bandes passantes de ces filtres restent spectralement stables et ne dérivent pas en réponse aux fluctuations extrêmes de température ou aux changements d'humidité. Tous les filtres peuvent être utilisés avec des ouvertures de f\/4 ou moins. Ils fournissent des services de revêtement personnalisés pour les applications d'imagerie plus exigeantes nécessitant des ouvertures plus grandes telles que f\/3 ou f\/2. Ils peuvent également fournir des tailles plus grandes et des bandes passantes uniques sur demande.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"Monté rond de 1,25 po","offer_id":44967248593181,"sku":"CT-27030-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm rond non monté","offer_id":44967248625949,"sku":"CT-27030-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm rond non monté","offer_id":44967248658717,"sku":"CT-27030-36D","price":497.0,"currency_code":"CAD","in_stock":true},{"title":"Monté rond de 2\"","offer_id":44967248691485,"sku":"CT-27030-2M","price":707.0,"currency_code":"CAD","in_stock":true},{"title":"50mm rond non monté","offer_id":44967248724253,"sku":"CT-27030-50D","price":637.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Carré Non Monté","offer_id":44967248757021,"sku":"CT-27030-50X50","price":770.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-LoGlow-Filter__74050.1596071521.1280.1280.jpg?v=1684339519"},{"product_id":"baader-moon-skyglow-filter","title":"Filtre Baader Moon \u0026amp; Skyglow","description":"\u003c!-- more --\u003e\u003cul\u003e\n\n\u003cli\u003eFiltre de contraste sélectif, pour tous les télescopes réflecteurs et réfracteurs\u003c\/li\u003e\n\n \u003cli\u003eFiltre les longueurs d'onde spécifiques, en particulier celles causées par l'éclairage public et surtout leur lumière diffusée qui éclaire le ciel nocturne\u003c\/li\u003e\n\n\u003cli\u003eLe blocage sélectif conserve les couleurs naturelles intactes, mais avec un RVB considérablement amélioré, ce qui entraîne des contrastes de couleurs plus importants.\u003c\/li\u003e\n\n\u003cli\u003e95% de transmission dans la gamme spectrale sélectionnée.\u003c\/li\u003e\n\n\u003cli\u003eConvient à tous les filetages de filtre standard et peut être combiné avec d'autres filtres, par exemple les filtres de couleur planétaires Baader polis optiquement. De cette façon, vous pouvez mieux voir les détails fins ou combiner plusieurs images avec un appareil photo monochrome pour obtenir des images en couleur.\u003c\/li\u003e\n\n\u003cli\u003eLe filtre est également optimisé pour l'astrophotographie grâce à son revêtement anti-UV\/IR complet. Lorsqu'elles sont utilisées avec des reflex numériques, les étoiles resteront beaucoup plus étroites, car les parties UV et IR non focalisées du spectre sont bloquées.\u003c\/li\u003e\n\n \u003cli\u003ePlaneoptically poli ; peut être utilisé devant une binoculaire ou pour la photographie afocale - loin de la mise au point sans perte de netteté !\u003c\/li\u003e\n\n\u003cli\u003eLe polissage optique fin et l'absence d'erreur de coin dans le verre garantissent une netteté parfaite lors d'un grossissement supérieur à 200x - tandis que les verres filtrants \"poli au feu\" beaucoup moins chers détruisent le front d'onde optique à des mags élevés\u003c\/li\u003e\n\n\u003cli\u003eVerre optique dopé au néodyme\u003c\/li\u003e\n\n\u003cli\u003eRevêtements avant\/arrière : revêtement BBAR dur à 7 couches \/ revêtement anti-UV\/IR diélectrique à 27 couches\u003c\/li\u003e\n\n\u003cli\u003eRevêtements durcis par faisceau d'ions ultra-durs et durables - peuvent être nettoyés à tout moment sans crainte. Bords de revêtement scellés anti-vieillissement.\u003c\/li\u003e\n\n\u003cli\u003e\u003ca href=\"\/fr\/pages\/why-baader-planetarium-filters\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ePourquoi les filtres de planétarium Baader ?\u003c\/a\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e \u003cp\u003eLe filtre Baader Planetarium Moon \u0026amp; Skyglow (néodyme) apporte une approche tout à fait unique à l'amélioration du contraste planétaire et à la réduction de la pollution lumineuse. Sur la base de recherches antérieures chez Carl Zeiss, Baader a développé un filtre qui utilise du verre au néodyme qui filtre quelques longueurs d'onde spécifiques des lampadaires ainsi que la lueur du ciel de la Lune. Les caractéristiques spectrales uniques du néodyme renforcent également les contrastes de couleurs en isolant les régions rouge, verte et bleue (ce que l'on appelle l'amélioration RVB). Le résultat est un filtre qui laisse les couleurs naturelles pour la plupart intactes, mais considérablement améliorées.\u003cbr\u003e \u003cbr\u003eLes vues planétaires et lunaires sont améliorées dans tous les oscilloscopes, réflecteurs, réfracteurs (APO ou Achro). La grande tache rouge de Jupiter et les teintes rouges des bandes sont sensiblement améliorées et le contraste des caractéristiques de la surface martienne est renforcé. Le ciel d'arrière-plan est assombri et les détails subtils sont améliorés. La haute efficacité du filtre préserve la luminosité de l'image et de nombreuses galaxies, nébuleuses et amas d'étoiles globulaires sont améliorés en raison de la réduction de la lueur du ciel due à l'éclairage artificiel. Pour un examen pratique du filtre Moon \u0026amp; Skyglow, visitez la section d'examen des accessoires sur www.cloudynights.com.\u003cbr\u003e\u003cbr\u003e La haute qualité des filtres Baader Planetarium permet un empilement sans dégradation de l'image. Les propriétaires d'Achromat trouveront que la combinaison de Moon \u0026amp; Skyglow et du nouveau filtre Fringe Killer est idéale pour l'observation planétaire. Le débit lumineux élevé et la coloration naturelle permettront aux achromates de fonctionner davantage comme des apochromates. Une version intégrée est également disponible, le filtre Semi-APO.\u003cbr\u003e \u003cbr\u003eLe Moon \u0026amp; Skyglow est également optimisé pour les imageurs, en raison de son blocage IR complet (voir la courbe de filtre sur la fiche technique incluse dans le lien ci-dessous).\u003cbr\u003e\u003cbr\u003e Le substrat du filtre est une fusion spéciale de verre dopé au néodyme, conçu pour des caractéristiques de transmission spécifiques et fabriqué uniquement pour le planétarium Baader. En plus de ses caractéristiques spectrales uniques, contrairement à la plupart des filtres, les surfaces Baader Moon \u0026amp; Skyglow sont optiquement polies pour offrir la meilleure netteté et le meilleur contraste d'image possible.\u003cbr\u003e \u003cbr\u003eLes images ci-dessous montrent la grande amélioration du contraste sur Mars. L'image de gauche a été prise sans filtration, tandis que l'image de droite a été prise à travers un Moon \u0026amp; Skyglow. L'image Moon \u0026amp; Skyglow montre un contraste nettement plus élevé et des caractéristiques de surface à peine visibles sans le filtre. Les deux images ont été acquises à l'identique, sans aucun traitement d'image ni amélioration du contraste, et donnent une très bonne idée de l'amélioration du contraste planétaire visible visuellement. Le Moon \u0026amp; Skyglow ne quitte jamais nos propres télescopes lors de l'observation des planètes et de la lune.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"source=\" https:\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eImage reproduite avec l'aimable autorisation de Jeremy Summers. Prise en novembre 2005 avec un appareil photo numérique Meade LXD55 8\" SCT et Canon A510 en mode vidéo\u003c\/strong\u003e\u003cbr\u003e \u003cstrong\u003e(images brutes empilées avec Registax, aucun traitement pour l'une ou l'autre image).\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n\u003ch2\u003e1.25\"\u003c\/h2\u003e\n\n\u003ctable\u003e\u003ctbody\u003e\n\n \u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003ePlanétarium Baader\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#)\u003c\/th\u003e\n\n\u003ctd\u003e2458305A\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCODE EAN\u003c\/th\u003e\n\n\u003ctd\u003e4047825009753\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,059\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eGAMME DE TRANSMISSION\u003c\/th\u003e\n\n\u003ctd\u003eplusieurs bandes (voir image spectrale)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eÉPAISSEUR DU FILTRE (SANS CELLULE)\u003c\/th\u003e\n\n\u003ctd\u003e1 millimètre\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n \u003cth\u003eREVÊTEMENT AR\u003c\/th\u003e\n\n\u003ctd\u003eGroupe Phantom Coating®, plan poli optiquement\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTAILLE DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003e1 25 pouces\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUTILISATION DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003eCCD, Amélioration du contraste, Correction des couleurs, IR-Cut, Réduction de la pollution lumineuse, Lunaire, Planétaire\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFILTRE MONTÉ\u003c\/th\u003e\n\n\u003ctd\u003eMonté (LPFC 6mm)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTYPE DE FILTRE\u003c\/th\u003e\n\n\u003ctd\u003ePasse-bande\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUNIQUE OU ENSEMBLE ?\u003c\/th\u003e\n\n\u003ctd\u003eFiltre unique\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFORME DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003erond\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch2\u003e2\"\u003c\/h2\u003e\n\n\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003ePlanétarium Baader\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#)\u003c\/th\u003e\n\n\u003ctd\u003e2458334A\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,062\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eGAMME DE TRANSMISSION\u003c\/th\u003e\n\n\u003ctd\u003eplusieurs bandes (voir image spectrale)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eÉPAISSEUR DU FILTRE (SANS CELLULE) \u003c\/th\u003e\n\n\u003ctd\u003e1 millimètre\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eREVÊTEMENT AR\u003c\/th\u003e\n\n\u003ctd\u003eGroupe Phantom Coating®, plan poli optiquement\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTAILLE DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003e2 pouces\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUTILISATION DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003eCCD, Amélioration du contraste, Correction des couleurs, IR-Cut, Réduction de la pollution lumineuse, Lunaire, Planétaire\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFILTRE MONTÉ\u003c\/th\u003e\n\n\u003ctd\u003eMonté (LPFC 6mm)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTYPE DE FILTRE\u003c\/th\u003e\n\n\u003ctd\u003ePasse-bande\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n \u003ctr\u003e\n\n\u003cth\u003eUNIQUE OU ENSEMBLE ?\u003c\/th\u003e\n\n\u003ctd\u003eFiltre unique\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFORME DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003erond\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\u003cdiv class=\"moretab\" data-title=\"Downloads \u0026amp; Support\"\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_baader_neodymium_moon_and_skyglow_filter.pdf?v=1684340698?v=1590140455\" target=\"_blank\"\u003eBaader Filtre Neodymium Moon \u0026amp; Skyglow\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_testreview_neodymium_moon_and_skyglow_t_licha.pdf?v=1684340701?v=1590140455\" target=\"_blank\"\u003eRevue de test - Neodymium Moon and Skyglow - T. Licha\u003c\/a\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_faq_problems_with_filters_can_have_the_strangest_causes.pdf?v=1684340622?v=1590138683\" target=\"_blank\"\u003eFAQ - Les problèmes avec les filtres peuvent avoir les causes les plus étranges\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_testreview_baader_anti_fringing_filters_astronomy_technology_today.pdf?v=1684340675?v=1590139318\" target=\"_blank\"\u003eRevue de test - Filtres anti-fringing Baader - Astronomy Technology Today\u003c\/a\u003e\u003c\/p\u003e\n\n\n\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Monté rond de 1,25 po","offer_id":44967363707165,"sku":"BAA-2458305A","price":130.0,"currency_code":"CAD","in_stock":true},{"title":"Monté rond de 2\"","offer_id":44967363739933,"sku":"BAA-2458334A","price":213.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Moon-Skyglowfilter-1-25-inch-1__79976.1597110984.1280.1280.jpg?v=1684341362"},{"product_id":"baader-uhc-s-l-booster-filter","title":"Baader Filtre UHC-S\/L-Booster","description":"\u003c!-- more --\u003e \u003cp\u003eLe filtre Baader Planetarium UHC-S Nebula excelle dans la fourniture d'une vue à contraste élevé et naturelle de la nébuleuse d'émission - sans gradation excessive ni perte de champs d'étoiles de fond. Le filtre parfait pour visualiser la nébuleuse d'émission des cieux pollués par la lumière, ou pour augmenter le contraste des nébuleuses des sites de ciel sombre. Les revêtements de technologie avancée permettent au filtre d'atteindre une transmission exceptionnelle de plus de 97% sur toute la bande passante, avec un blocage total des lignes de pollution lumineuse importantes. Cela se traduit par une luminosité et un contraste maximum de l'image. Les propriétaires de télescopes plus petits, de 4 à 10 pouces, apprécieront particulièrement la grande efficacité, et les utilisateurs de plus grandes portées adoreront les champs d'étoiles riches et les ombrages nébulaires subtils et détaillés qui sont laissés intacts.\u003c\/p\u003e \u003cp\u003eLe Baader UHC-S parvient à améliorer le contraste des filtres typiques à large bande ou dits \"Deep Sky\". Le fond du ciel est plus sombre et le contraste des nébuleuses à émission est sensiblement amélioré. La plupart des autres filtres \"UHC\" ont tendance à assombrir excessivement le ciel et les champs d'étoiles, laissant les nébuleuses artificielles et plates, sur un fond vide. La transmission élevée, les coupures nettes et la bande passante plus modérée de 60 nm du filtre Baader UHC-S conservent une vue plus naturelle, tout en augmentant considérablement le contraste global. Les imageurs apprécieront la bande passante plus large et l'inclusion d'une bande passante H-Alpha extrêmement efficace (\u0026gt; 99 % à 656 nm), ainsi que la qualité optique extrême.\u003c\/p\u003e \u003cp\u003eAu cœur des filtres Baader UHC-S se trouvent leur processus spécial de polissage de substrat optique fin et leur conception de revêtement avancée. Le résultat est un filtre qui n'entraîne aucune dégradation de l'image, contrairement aux autres filtres. Pour éviter la détérioration due au nettoyage ou à l'exposition à l'humidité, certains autres filtres ont même recours à la prise en sandwich de leurs revêtements délicats entre deux couches de verre filtrant, ce qui peut entraîner des images floues ou doubles. La combinaison de revêtements durcis et d'un substrat optique fin du Baader UHC-S évite cette dégradation de l'image. Une perception erronée courante est que l'observation du ciel profond est limitée à de faibles puissances et que la résolution de l'image n'est pas aussi importante que dans l'observation planétaire. En réalité, les grossissements élevés sont très courants et utiles pour étudier les détails fins, en particulier pour les nébuleuses diffuses et planétaires plus brillantes. Les filtres Baader UHC-S peuvent prendre des grossissements élevés et les étoiles conservent leur netteté, même si le filtre est utilisé loin devant le plan de l'image (c'est-à-dire pour une utilisation en imagerie, ou devant une diagonale en étoile ou une binoculaire). Les filtres Baader répondent aux exigences d'un filtre idéal - pour effectuer leur filtration avec une efficacité maximale sans aucun autre effet détectable sur l'image. \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_uv_ir_3_8d5101ed_1746_457c_bfd8_080b96b5fdf2_480x480.jpg?v=1684340662?v=1585156984\" alt=\"\u0026gt;\u0026lt;\/p\u0026gt;\u0026lt;p\u0026gt;\u0026lt;strong\u0026gt;Courbe de transmission typique\u0026lt;\/strong\u0026gt;\u0026lt;\/p\u0026gt;\u0026lt;\/div\u0026gt;\u0026lt;\/div\u0026gt;\u0026lt;div data-custom-tab\u0026gt;\u0026lt;p data-custom-tab-title\u0026gt;Spécifications\u0026lt; \/p\u0026gt;\u0026lt;div\u0026gt;\u0026lt;h2\u0026gt;1.25\"\u003e\u003c\/p\u003e\n\u003ctable\u003e \u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003ePlanétarium Baader\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#)\u003c\/th\u003e\n\n\u003ctd\u003e2458275\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,059\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eGAMME DE TRANSMISSION\u003c\/th\u003e\n\n\u003ctd\u003eplusieurs bandes (voir image spectrale)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eÉPAISSEUR DU FILTRE (SANS CELLULE)\u003c\/th\u003e\n\n\u003ctd\u003e2 millimètres\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eREVÊTEMENT AR\u003c\/th\u003e\n\n\u003ctd\u003eà revêtement diélectrique, plan poli optiquement\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTAILLE DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003e1 25 pouces\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUTILISATION DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003eAmélioration du contraste, Réduction de la pollution lumineuse, Luminance\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFILTRE MONTÉ\u003c\/th\u003e\n\n\u003ctd\u003eMonté (LPFC 6mm)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTYPE DE FILTRE\u003c\/th\u003e\n\n\u003ctd\u003ePasse-bande\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUNIQUE OU ENSEMBLE ?\u003c\/th\u003e\n\n\u003ctd\u003eFiltre unique\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFORME DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003erond\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e2\"\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003ePlanétarium Baader\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#)\u003c\/th\u003e\n\n\u003ctd\u003e2458276\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCODE EAN\u003c\/th\u003e\n\n\u003ctd\u003e4047825009852\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,065\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eGAMME DE TRANSMISSION\u003c\/th\u003e\n\n\u003ctd\u003eplusieurs bandes (voir image spectrale)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eÉPAISSEUR DU FILTRE (SANS CELLULE)\u003c\/th\u003e\n\n\u003ctd\u003e2 millimètres\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTAILLE DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003e2 pouces\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFILTRE MONTÉ\u003c\/th\u003e\n\n\u003ctd\u003eMonté (LPFC 6mm)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTYPE DE FILTRE\u003c\/th\u003e\n\n\u003ctd\u003ePasse-bande\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUNIQUE OU ENSEMBLE ?\u003c\/th\u003e\n\n\u003ctd\u003eFiltre unique\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFORME DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003erond\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch6\u003e\u003c\/h6\u003e\n\u003ch2\u003e36mm\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003ePlanétarium Baader\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#)\u003c\/th\u003e\n\n\u003ctd\u003e2459420\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCODE EAN\u003c\/th\u003e\n\n\u003ctd\u003e4047825024701\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,025\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eGAMME DE TRANSMISSION\u003c\/th\u003e\n\n\u003ctd\u003eplusieurs bandes (voir image spectrale)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eÉPAISSEUR DU FILTRE (SANS CELLULE)\u003c\/th\u003e\n\n\u003ctd\u003e2 millimètres\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eREVÊTEMENT AR\u003c\/th\u003e\n\n\u003ctd\u003eà revêtement diélectrique, plan poli optiquement\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTAILLE DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003e36 millimètres\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUTILISATION DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003eAmélioration du contraste, Réduction de la pollution lumineuse, Luminance\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFILTRE MONTÉ\u003c\/th\u003e\n\n\u003ctd\u003eNon monté\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTYPE DE FILTRE\u003c\/th\u003e\n\n\u003ctd\u003ePasse-bande\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUNIQUE OU ENSEMBLE ?\u003c\/th\u003e\n\n\u003ctd\u003eFiltre unique\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFORME DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003erond\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003e50,4 mm\u003c\/h2\u003e\n\u003ctable\u003e\n\n\u003ccolgroup\u003e\n\n\u003ccol width=\"25%\"\u003e\n\n\u003ccol\u003e\n\n\n\u003c\/colgroup\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003ePlanétarium Baader\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#)\u003c\/th\u003e\n\n\u003ctd\u003e2458278\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCODE EAN\u003c\/th\u003e\n\n\u003ctd\u003e4047825021458\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,07\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eGAMME DE TRANSMISSION\u003c\/th\u003e\n\n\u003ctd\u003eplusieurs bandes (voir image spectrale)\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eÉPAISSEUR DU FILTRE (SANS CELLULE)\u003c\/th\u003e\n\n\u003ctd\u003e3 millimètres\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eREVÊTEMENT AR\u003c\/th\u003e\n\n\u003ctd\u003eà revêtement diélectrique, plan poli optiquement\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTAILLE DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003e50,4 millimètres\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUTILISATION DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003eAmélioration du contraste, Réduction de la pollution lumineuse, Luminance\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFILTRE MONTÉ\u003c\/th\u003e\n\n\u003ctd\u003eNon monté\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTYPE DE FILTRE\u003c\/th\u003e\n\n\u003ctd\u003ePasse-bande \u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUNIQUE OU ENSEMBLE ?\u003c\/th\u003e\n\n\u003ctd\u003eFiltre unique\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFORME DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003erond\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\u003ch2\u003e50x50mm\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003ePlanétarium Baader\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#)\u003c\/th\u003e\n\n\u003ctd\u003e2458279\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCODE EAN\u003c\/th\u003e\n\n\u003ctd\u003e4047825021472\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,074 \u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eGAMME DE TRANSMISSION\u003c\/th\u003e\n\n\u003ctd\u003eplusieurs bandes (voir image spectrale)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eÉPAISSEUR DU FILTRE (SANS CELLULE)\u003c\/th\u003e\n\n\u003ctd\u003e3 millimètres\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eREVÊTEMENT AR\u003c\/th\u003e\n\n\u003ctd\u003eà revêtement diélectrique, plan poli optiquement\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTAILLE DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003e50 x 50 mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUTILISATION DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003eAmélioration du contraste, Réduction de la pollution lumineuse, Luminance\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n \u003cth\u003eFILTRE MONTÉ\u003c\/th\u003e\n\n\u003ctd\u003eNon monté\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTYPE DE FILTRE\u003c\/th\u003e\n\n\u003ctd\u003ePasse-bande\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUNIQUE OU ENSEMBLE ?\u003c\/th\u003e\n\n\u003ctd\u003eFiltre unique\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFORME DU FILTRE\u003c\/th\u003e\n\n\u003ctd\u003ecarré\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cdiv class=\"moretab\" data-title=\"Downloads \u0026amp; Support\"\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_faq_problems_with_filters_can_have_the_strangest_causes.pdf?v=1684340622?v=1590138683\" target=\"_blank\"\u003eFAQ - Les problèmes avec les filtres peuvent avoir les causes les plus étranges\u003c\/a\u003e\u003c\/p\u003e\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Monté rond de 1,25 po","offer_id":44967365017885,"sku":"BAA-2961560","price":143.0,"currency_code":"CAD","in_stock":true},{"title":"Monté rond de 2\"","offer_id":44967365050653,"sku":"BAA-2961563","price":247.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted Filter","offer_id":49144651645213,"sku":"BAA-2961561","price":166.0,"currency_code":"CAD","in_stock":true},{"title":"Filtre non monté rond de 36 mm","offer_id":44967364919581,"sku":"BAA-2961562","price":201.0,"currency_code":"CAD","in_stock":true},{"title":"Filtre non monté rond de 50,4 mm","offer_id":44967364952349,"sku":"BAA-2961564","price":255.0,"currency_code":"CAD","in_stock":true},{"title":"Filtre carré 50x50mm","offer_id":44967364985117,"sku":"BAA-2961565","price":401.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-UHC-S-L-Booster-Filter-1__73722.1597110998.1280.1280.jpg?v=1684341377"},{"product_id":"optolong-l-pro-filter","title":"Optolong Filtre L-Pro","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFiltre de réduction de la pollution lumineuse\u003c\/li\u003e\n\u003cli\u003eConserve la balance\u0026nbsp;naturel des couleurs de vos images\u003c\/li\u003e\n\u003cli\u003eEfficace pour une utilisation dans les zones polluées par la lumière\u003c\/li\u003e\n\u003cli\u003eConvient à un usage visuel et photographique\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\u003eCaractéristiques\u003c\/li\u003e\n\u003cli\u003eDans la boîte\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\u003c!-- Title image text --\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\u003c!-- Main Image --\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003ePrésentation du filtre Optolong L-Pro\u003c\/h2\u003e\n\u003cp\u003eLe filtre Optolong L-Pro est l'un des filtres anti-pollution lumineuse les plus polyvalents disponibles pour l'astrophotographie et l'observation visuelle. Conçu avec une technologie multi-bande passe-haut avancée, il réduit sélectivement les effets de l'éclairage artificiel, comme les lampes à vapeur de mercure et de sodium, tout en préservant les couleurs naturelles des étoiles et des objets du ciel profond. Contrairement aux filtres à bande étroite agressifs qui limitent le choix de la cible, le L-Pro atteint un équilibre délicat\u0026nbsp;: il supprime la lumière indésirable sans compromettre le réalisme des couleurs.\u003c\/p\u003e\n\u003cp\u003ePour les astrophotographes travaillant dans des zones soumises à une pollution lumineuse modérée à forte, l'Optolong L-Pro est souvent l'un des premiers filtres que nous recommandons. Il offre une amélioration notable du contraste et des détails sans les inconvénients des variations de couleurs artificielles. Que vous photographiiez des galaxies en large bande ou des nébuleuses en émission, le L-Pro offre des résultats constants et de haute qualité.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- image text --\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\u003c!-- Text Section --\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003eSuppression de la pollution lumineuse\u003c\/h3\u003e\n\u003cp\u003eLe filtre L-Pro est efficace en réduisant sélectivement la transmission de longueurs d'onde spécifiques associées à la pollution lumineuse artificielle, notamment les lampes à vapeur de mercure, à vapeur de sodium haute et basse pression. De plus, il atténue la lumière naturelle indésirable causée par l'émission d'oxygène neutre, source de la luminescence nocturne. Parallèlement, le filtre L-Pro maintient une transparence élevée sur les principales raies d'émission des nébuleuses\u0026nbsp;: H-alpha (656\u0026nbsp;nm), OIII (496\u0026nbsp;nm et 500\u0026nbsp;nm), H-bêta (486\u0026nbsp;nm) et SII (672\u0026nbsp;nm). Ce profil de transmission précis améliore le contraste et les détails, ce qui en fait un filtre idéal pour les applications d'imagerie et de visualisation haut de gamme en environnements périurbains et urbains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Image Section --\u003e\n\u003cdiv class=\"DAV-section-img\"\u003e\u003cimg alt=\"Comparaison Optolong L-Pro\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Pro-comparison.jpg?v=1756067242\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- image text --\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\u003c!-- Text Section --\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003eVéritable équilibre des couleurs\u003c\/h3\u003e\n\u003cp\u003eL'un des atouts majeurs de l'Optolong L-Pro est son profil de transmission équilibré. Ce filtre présente un très faible taux de réduction de transmission pour les objets célestes à large bande passante. Cette propriété lui confère une efficacité exceptionnelle pour supprimer la pollution lumineuse sans impacter significativement les caractéristiques spectrales naturelles d'objets tels que les galaxies et les nébuleuses par réflexion. C'est une caractéristique essentielle pour l'astrophotographie, qui exige une reproduction fidèle des couleurs, garantissant ainsi aux images un aspect naturel avec un post-traitement minimal.\u003c\/p\u003e\n\u003ch3\u003eBlocage UV et IR\u003c\/h3\u003e\n\u003cp\u003eLa conception du filtre L-Pro supprime intrinsèquement les longueurs d'onde ultraviolettes (UV) et infrarouges (IR). Cette fonctionnalité simplifie le flux d'imagerie en éliminant le besoin d'un filtre anti-IR distinct, ce qui permet de l'utiliser pour l'imagerie du canal «\u0026nbsp;L\u0026nbsp;» (luminance) avec les caméras CMOS. Cette capacité de blocage complète garantit que la lumière parasite provenant des deux extrémités du spectre visible n'interfère pas avec l'image finale.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Image Section --\u003e\n\u003cdiv class=\"DAV-section-img\"\u003e\u003cimg alt=\"Graphique de transmission Optolong L-Pro\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Pro-Transmission-Graph.png?v=1756067243\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\u003c!-- Text Section --\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003ePour l'imagerie et l'utilisation visuelle\u003c\/h3\u003e\n\u003cp\u003eBien qu'optimisé pour l'astrophotographie, le L-Pro profite également aux observateurs visuels, offrant des arrière-plans plus sombres et un contraste amélioré lors de la visualisation sous un ciel urbain ou suburbain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Image Section --\u003e\n\u003cdiv class=\"DAV-section-img\"\u003e\u003cimg alt=\"Filtre L-Pro installé sur l'oculaire\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Pro-on-Eyepiece.png?v=1756067242\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\u003c!-- Text Section --\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003eDisponible sous forme de filtres à clipser pour appareils photo reflex numériques et sans miroir\u003c\/h3\u003e\n\u003cp\u003eDisponible dans des tailles courantes (1,25\", 2\" et formats clipsables pour appareils photo reflex numériques), il s'intègre parfaitement aux télescopes, réfracteurs et objectifs d'appareil photo.\u003c\/p\u003e\n\u003ch4\u003eOptions de clipsage\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCanon EOS APS-C\u003c\/li\u003e\n\u003cli\u003eCanon EOS plein format\u003c\/li\u003e\n\u003cli\u003eCanon EOS R*\u003c\/li\u003e\n\u003cli\u003eNikon plein format\u003c\/li\u003e\n\u003cli\u003eSony plein format\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e*En raison des particularités des appareils photo Canon R, des bandes sombres verticales peuvent apparaître sur les deux bords lors de l'utilisation d'un filtre interférentiel. Il peut être nécessaire de recadrer l'image ou de la corriger en post-traitement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Image Section --\u003e\n\u003cdiv class=\"DAV-section-img\"\u003e\u003cimg alt=\"Filtre L-Pro installé sur un reflex numérique\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Pro-on-DSLR.jpg?v=1756067427\"\u003e\u003c\/div\u003e\n\u003c\/div\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\u003e\n\u003cp\u003eMatériel\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eVerre optique Schott B270\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eÉpaisseur\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eFiltres à visser : 2,0 mm\u003c\/p\u003e\n\u003cp\u003eFiltres à clipser\u0026nbsp;: 1,0\u0026nbsp;mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eHauteur de la cellule filtrante (versions 1,25\" et 2\")\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e4,8 mm sans filetage mâle, 6,8 mm avec filetage\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eSpectre\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e380-750 nm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eQualité de surface\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e60\/40 (se référer à MIL-O-13830)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003ePolissage optique\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003ePoli optiquement pour garantir un front d'onde précis de 1\/4 et un parallélisme \u0026lt; 30 secondes\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eTransmission\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eTransmission élevée aux principales raies d'émission des nébuleuses : H-alpha (656 nm), OIII (496 nm et 500 nm), SII (672 nm) et H-beta (486 nm)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eBlocage\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eBlocage hors bande de précision des principales raies d'émission de pollution lumineuse artificielle : Na (589 nm), Hg (435 nm et 578 nm)\u003c\/p\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\u003cimg class=\"DAV-img-box\" alt=\"Filtre L-Pro\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Pro-2inch__58386.1612893783.1280.1280_dd518ef8-57b9-43a5-ac1c-d450992a2b0a.jpg?v=1698452919\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFiltre L-Pro\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003cimg class=\"DAV-img-box\" alt=\"Boîtier de filtre en plastique\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-Filter-Case.png?v=1756067596\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBoîtier de filtre en plastique\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c!-- Add more items as needed --\u003e\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Monté","offer_id":44967780811037,"sku":"OPT-10201","price":199.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Monté","offer_id":44967780843805,"sku":"OPT-10202","price":279.0,"currency_code":"CAD","in_stock":true},{"title":"Clip pour Canon EOS APS-C","offer_id":44967780909341,"sku":"OPT-10203","price":349.0,"currency_code":"CAD","in_stock":true},{"title":"Clip pour Canon EOS Plein Format","offer_id":44967780942109,"sku":"OPT-LPRO-EOS-FF","price":377.0,"currency_code":"CAD","in_stock":true},{"title":"Clip pour Nikon Plein Format","offer_id":44967780974877,"sku":"OPT-LPRO-NIKON-FF","price":377.0,"currency_code":"CAD","in_stock":true},{"title":"Clip pour Sony Plein Format","offer_id":44967781007645,"sku":"OPT-10208","price":377.0,"currency_code":"CAD","in_stock":true},{"title":"Clip pour Canon EOS-R","offer_id":44967781040413,"sku":"OPT-10211","price":349.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Nikon Z Full Frame","offer_id":52942348484893,"sku":"OPT-LPRO-NK-Z","price":349.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Optolong-L-Pro-2inch__58386.1612893783.1280.1280.jpg?v=1684345839"},{"product_id":"optolong-l-enhance-filter","title":"Filtre Optolong L-Enhance","description":"\u003c!-- more --\u003e \u003cp\u003e\u003cspan\u003eOptolong L-eNhance est un filtre passe-bande double qui a été conçu pour les appareils photo reflex numériques (SLR), CMOS couleur et CCD monochromes. La commodité et la rentabilité de ce filtre permettent aux amateurs d'imager une riche sélection d'images astronomiques, même dans des zones lumineuses et fortement polluées par la lumière. Il isole efficacement les raies d'émission des nébuleuses H-Alpha, H-Beta et Oxygen III et atteint une transmission maximale pouvant atteindre 90 %. Les performances de ce filtre offrent des images qui contrôlent superbement.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e Introduction\u003c\/h3\u003e\n\u003cp\u003e \u003cspan\u003eLa propagation incessante de l'urbanisation et sa pollution lumineuse associée sont devenues un problème croissant pour tous les photographes astro amateurs. Les solutions actuelles au problème peuvent être coûteuses et peuvent inclure l'achat d'une caméra monochrome, plusieurs types de filtres à bande étroite et une roue à filtres.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003cspan\u003e\u003cstrong\u003eOptolong L-eNhance\u003c\/strong\u003e apporte une solution économique et pratique pour les amateurs. Il s'agit d'un filtre passe-bande double qui a été conçu pour les appareils photo reflex numériques (reflex numériques), CMOS couleur et CCD monochromes. La commodité et la rentabilité de ce filtre permettent aux amateurs d'imager une riche sélection d'images astronomiques, même dans des zones lumineuses et fortement polluées par la lumière. Optolong pense que la conception de notre filtre L-eNhance est une innovation technique parmi les filtres. Il isole efficacement les raies d'émission des nébuleuses H-Alpha, H-Beta et Oxygen III et atteint une transmission maximale pouvant atteindre 90 %. Les performances de ce filtre offrent des images qui contrôlent parfaitement l'impact d'un ciel pollué par la lumière.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003cspan\u003eL'hydrogène est l'élément le plus grand, le plus primitif, le plus simple et le plus ancien de l'univers. Les scientifiques considèrent que l'hydrogène représente plus de 90 % de la substance visible dans l'espace. Notre soleil a 5 milliards d'années, mais jusqu'à présent, l'hydrogène est toujours la matière clé de la fusion nucléaire. Bien que l'élément soufre n'ait pas beaucoup d'importance scientifique, garder H et O a donc un sens pour l'exploration de la vie.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003ePar conséquent, nous mettons en évidence Ha, Hb, O3 et O2, et réduisons le signal de soufre.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e données techniques\u003c\/h3\u003e\n\u003cp\u003e \u003cspan\u003eSbustrate: B270\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eÉpaisseur : 1,85 mm\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eTpeak : T\u0026gt;90 %\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003ePlage de blocage : 300-1000nm\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eProfondeur de blocage : blocage de la ligne de pollution lumineuse \u0026gt; 99 %\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eQualité de surface : 60\/40\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eFront d'onde transmis RMS : λ\/4\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eParallélisme : 30s\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\" Monté","offer_id":44967781531933,"sku":"OPT-13801","price":251.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Monté","offer_id":44967781564701,"sku":"OPT-13802","price":321.0,"currency_code":"CAD","in_stock":true},{"title":"Clip pour Canon EOS APS-C","offer_id":44967781597469,"sku":"OPT-13804","price":363.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Optolong-L-Enhance-2inch__85261.1612894707.1280.1280.jpg?v=1684345842"},{"product_id":"optolong-uhc-filter","title":"Filtre UHC Optolong","description":"\u003c!-- more --\u003e\u003cp\u003e \u003cspan\u003eOptolong UHC avec une bande passante plus étroite offre un contraste plus élevé. Ainsi, il est plus adapté à l'environnement urbain où vous souffrez d'une pollution lumineuse sévère.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e Introduction\u003c\/h3\u003e \u003cp\u003e\u003cspan\u003eLe filtre large bande UHC (Ultra High Contrast) est conçu pour améliorer la visibilité de divers objets du ciel profond. En réduisant sélectivement la transmission des longueurs d'onde des polluants lumineux, en particulier ceux produits par les éclairages artificiels, y compris les lampes à vapeur de mercure, les lampes à vapeur de sodium haute et basse pression et la lumière naturelle indésirable causée par l'émission d'oxygène neutre dans notre atmosphère (c'est-à-dire la lueur du ciel). Avec les lignes d'émission de nébuleuse principales hautement transparentes à OIII (496 nm et 500 nm), H-bêta (486 nm), NII (654 nm et 658 nm), H-alpha (656 nm) ainsi que SII (672 nm), le filtre convient pour améliorer le contraste et les détails à des fins visuelles et photographiques dans les zones sous-rurales à forte pollution lumineuse.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eUtilisation principale et performances\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eConvient aux caméras CCD couleur et aux reflex numériques non modifiés.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eUHC avec une bande passante plus étroite offre un contraste plus élevé que CLS. Ainsi, il est plus adapté à l'environnement urbain où vous souffrez d'une pollution lumineuse sévère.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan\u003eUHC a une bande passante rouge substantielle et offre de superbes vues pour des objets comme la nébuleuse d'Orion (M42).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eLe filtre de pollution lumineuse n'élimine pas les effets de la pollution lumineuse et n'augmente pas la luminosité de l'objet. Dans de nombreux cas, ils augmentent le contraste entre la nébuleuse et le ciel nocturne, sans éclaircir la nébuleuse.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e AVERTISSEMENT : Les filtres d'Optolong ne sont pas conçus pour l'observation du soleil. NE PAS REGARDER LE SOLEIL AVEC LE FILTRE OPTOLONG. Vous seriez AVEUGLE si vous ne respectez pas l'avertissement.\u003c\/p\u003e\n\u003ch3\u003e données techniques\u003c\/h3\u003e\n\u003cp\u003e \u003cspan\u003eSubstrat : verre optique\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eTav\u0026gt;95%\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003ePlage de blocage : 300-700 nm\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eProfondeur de blocage : OD3, blocage des lignes de pollution lumineuse \u0026gt; 99 %\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eQualité de surface : 60\/40 (Se référer à\u003c\/span\u003e \u003cspan\u003eMIL-O-13830A, MIL-C-48497A\u003c\/span\u003e \u003cspan\u003e)\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eFront d'onde transmis RMS :\u003c\/span\u003e \u003cspan\u003e¼\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e \u003cspan\u003eλ\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eParallélisme : 30s\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\" Monté","offer_id":44967781695773,"sku":"OPT-10101","price":77.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Monté","offer_id":44967781728541,"sku":"OPT-10102","price":119.0,"currency_code":"CAD","in_stock":true},{"title":"Clip pour Canon EOS APS-C","offer_id":44967781761309,"sku":"OPT-UHC-EOS-APSC","price":133.0,"currency_code":"CAD","in_stock":true},{"title":"Clip pour Canon EOS Plein Format","offer_id":44967781794077,"sku":"OPT-UHC-EOS-FF","price":161.0,"currency_code":"CAD","in_stock":true},{"title":"Clip pour Nikon Plein Format","offer_id":44967781826845,"sku":"OPT-UHC-NIKON-FF","price":161.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Optolong-UHC-2inch__75062.1612994619.1280.1280.jpg?v=1684345844"},{"product_id":"antlia-triband-rgb-ultra-filter","title":"Antlia Filtre Triband RGB Ultra","description":"\u003c!-- more --\u003e\u003cp\u003e \u003cspan\u003eIl est conçu pour la suppression de la pollution lumineuse pour les caméras OSC et Mono. La\u003c\/span\u003e \u003cspan\u003econception spectrale a sélectionné les informations les plus substantielles dans les bandes RVB, ce qui permet au filtre Antlia Triband RGB Ultra de filmer plus de 90% des objets du ciel profond, en plus de ses excellentes performances sur la nébuleuse d'émission, différente des autres filtres à bande ultra-étroite, il est capable de capturer des galaxies, des nébuleuses par réflexion et des amas d'étoiles d'un emplacement Bortle 8 à Bortle 1 tout en présentant des couleurs RVB plus équilibrées dans vos images. En outre, il dispose d'une large\u003c\/span\u003e \u003cspan\u003ebande passante conçue pour faire face à des optiques plus rapides jusqu'au rapport focal f\/2.\u003c\/span\u003e\u003c\/p\u003e \u003cp\u003e\u003cspan\u003eL'efficacité quantique du canal B dans les capteurs CMOS actuels est souvent nettement inférieure à celle des canaux R et G.\u003c\/span\u003e \u003cspan\u003eL'équipe d'Antlia devait fournir un filtre avec une balance des couleurs plus réaliste pour l'astrophotographie à partir d'endroits pollués par la lumière.\u003c\/span\u003e \u003cspan\u003eLe problème de la faible efficacité de la longueur d'onde bleue devient apparent lors de l'imagerie des nébuleuses par réflexion et des étoiles bleues. Dans\u003c\/span\u003e \u003cspan\u003eles capteurs CMOS, les longueurs d'onde bleues contiennent également une contribution du spectre vert plus fort, affectant ainsi l'équilibre\u003c\/span\u003e \u003cspan\u003edes couleurs bleues. De nombreux objets d'imagerie populaires contiennent une nébuleuse par réflexion avec de faibles teintes bleues telles que la partie centrale de\u003c\/span\u003e \u003cspan\u003eNGC2264. Par conséquent, nous avons conçu le filtre Antlia Triband RGB Ultra qui non seulement conserve le signal d'émission HSO, mais\u003c\/span\u003e \u003cspan\u003eaugmente également la quantité de flux lumineux du canal B bleu. En améliorant la transmission de la longueur d'onde bleue, la couleur de la\u003c\/span\u003e \u003cspan\u003ephoto est mieux équilibrée et plus facile à gérer en post-traitement.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"2\" Monté","offer_id":44968075231517,"sku":"ANT-TRIBAND-V2","price":254.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ANT-TRI-RGB-2__19119.1677769060.1280.1280.jpg?v=1684348732"},{"product_id":"antlia-quad-band-light-pollution-filter-2","title":"Antlia Filtre Quad Band anti-pollution lumineuse - 2\"","description":"\u003c!-- more --\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLe filtre anti-pollution lumineuse Antlia Quad Band est un filtre de suppression de lumière pour les caméras couleur et monochromes. Il est capable de photographier la plupart des objets du ciel profond comme les galaxies, les nébuleuses par réflexion, les nébuleuses par émission et les amas d'étoiles depuis un emplacement Bortle 8 vers Bortle 1 alors que sa transmission spectrale passe à travers la région de la lumière visible, le proche ultraviolet (NUV) et le proche infrarouge ( NIR).\u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e Le filtre Antlia Quad Band possède une large bande passante conçue pour gérer des optiques plus rapides jusqu'au rapport focal f\/2.\u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e Compte tenu des caractéristiques de haute efficacité quantique (QE) des dernières caméras dans la région proche infrarouge et que cette région est moins sensible à la pollution lumineuse artificielle, le filtre anti-pollution lumineuse quadri-bande Antlia ajoute une transmission élevée dans la bande proche infrarouge (NIR). . Cette conception de spectre améliore le rapport signal\/bruit et le contraste de l'image en capturant les signaux dans les bandes visibles et la région NIR, tout en maintenant une bonne balance des couleurs et en étant plus facile à gérer en post-traitement.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\n \u003cp data-mce-fragment=\"1\"\u003eCertains objets à spectre complet comme M51, M83 possèdent un signal significatif dans la région proche infrarouge (NIR), vous pouvez éventuellement capturer ces objets du ciel profond avec plus de contraste avec le filtre Antlia Quad Band dans des conditions de pollution lumineuse.\u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e Lorsque vous utilisez ce filtre avec une caméra dotée d'un verre de protection anti-UV\/IR, le signal de transmission de la bande visible est conservé, mais la coupure IR limite votre capacité à capturer des cibles avec un signal infrarouge.\u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e Par conséquent, le filtre Antlia Quad Band est plus adapté aux caméras équipées d'un verre de protection AR car elles peuvent capturer à la fois les signaux NIR et la bande visible. \u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\n\u003cp class=\"p\" data-mce-fragment=\"1\"\u003e Spécifications \u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003edu spectre\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e :\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/strong\u003e \u003c\/p\u003e\n\n\u003ctable border=\"0\" cellspacing=\"0\" width=\"580\" data-mce-fragment=\"1\"\u003e\n\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\n\u003ctr data-mce-fragment=\"1\"\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/td\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eH-alpha\u003c\/span\u003e\u003c\/strong\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"100\" valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eS-II\u003c\/span\u003e\u003c\/strong\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"107\" valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\n \u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eO-III\u003c\/span\u003e\u003c\/strong\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"103\" valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eH-bêta\u003c\/span\u003e\u003c\/strong\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eNI\u003c\/span\u003e\u003c\/strong\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr data-mce-fragment=\"1\"\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eLongueur d'onde\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e656,3 nm\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"100\" valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e671,6 nm\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e672,4 nm\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"107\" valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e495,9 nm,\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e500,7 nm\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"103\" valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e486,1 nm\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e658,3 nm\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e654,8 nm\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr data-mce-fragment=\"1\"\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eTransmission de pointe\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e＞92%\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"100\" valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e＞92%\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"107\" valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e＞92%\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"103\" valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e＞92%\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003e92%\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr data-mce-fragment=\"1\"\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eBlocage\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"534\" valign=\"center\" colspan=\"5\" data-mce-fragment=\"1\"\u003e\n\n \u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e≥OD4@ 300-1\u003c\/span\u003e \u003cspan data-mce-fragment=\"1\"\u003e050\u003c\/span\u003e \u003cspan data-mce-fragment=\"1\"\u003enm\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr data-mce-fragment=\"1\"\u003e\n\n\u003ctd valign=\"center\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eÉpaisseur du filtre\u003c\/span\u003e \u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd width=\"534\" valign=\"center\" colspan=\"5\" data-mce-fragment=\"1\"\u003e\n\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e2 mm +\/-0,05 mm\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eLes principales caractéristiques et applications :\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e - Anti-pollution lumineuse\u003c\/p\u003e\n\n\u003cp\u003e Le filtre Antlia Quad Band est une solution efficace pour réduire la pollution lumineuse, car il supprime la plupart des lumières orange-jaune de 589 nm et une partie des lumières bleues des LED.\u003c\/p\u003e\n\n\u003cp\u003e - Possibilité de photographier plus de 95 % des objets du ciel profond\u003c\/p\u003e\n\n\u003cp\u003e - La conception spectrale unique offre plus de possibilités pour l'astrophotographie\u003c\/p\u003e\n\n\u003cp\u003e - La transmission élevée des principales raies d'émission Ha\/SII\/OIII\/H-Beta dans la région visible, améliore le SNR et le contraste élevés de l'astrophotographie ;\u003c\/p\u003e\n\n\u003cp\u003e - Transmission dans la région proche infrarouge (NIR)\u003c\/p\u003e\n\n\u003cp\u003e - Le passage dans la région proche infrarouge permet de photographier des objets du ciel profond qui ne peuvent pas être filmés avec d'autres filtres sans transmission NIR.\u003c\/p\u003e\n\n\u003cp\u003e - Le large bande passante conçu pour gérer des optiques plus rapides jusqu'au rapport focal f\/2.\u003c\/p\u003e\n\n\u003cp\u003e - Bon équilibre des couleurs\u003c\/p\u003e\n\n \u003cp\u003e- Il est plus facile d'obtenir l'équilibre des couleurs en ajoutant la transmission à courte longueur d'onde\u003c\/p\u003e\n\n\u003cp\u003e - Une fiabilité optique supérieure réduit le traitement post-image\u003c\/p\u003e\n\n\u003cp\u003e - Substrat de base : Substrat optique, simple\/non collé\u003c\/p\u003e\n\n\u003cp\u003e - Qualité de surface : S\/D (rayer\/creuser) = 60\/40 (voir MIL-O-13830)\u003c\/p\u003e\n\n\u003cp\u003e - Front d'onde transmis : Lambda\/4 ou mieux.\u003c\/p\u003e\n\n\u003cp\u003e - Parallélisme : moins de 30 arcsec\u003c\/p\u003e\n\n\u003cp\u003e - Garantie : 3 ans contre le délaminage\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46978718892317,"sku":"ANT-QUAD-2","price":281.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Antlia-Quad-Band.jpg?v=1699120543"},{"product_id":"idas-nbz-ii-ha-oiii-nebula-booster-filter","title":"IDAS NBZ-II HA OIII Nebula Booster Filter","description":"\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e2\"\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOIII 8nm (+\/-0.4nm)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eH-alpha 9.5nm (+\/- 0.4nm) (originally designed at 10nm, but on a measured basis, it's 9.5nm.)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IDAS","offers":[{"title":"Default Title","offer_id":50122991141149,"sku":"IDA-NBZ-II-48ST2","price":418.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/IDASNBZ-II48mmST2MBTIAD720x600..png?v=1751480220"},{"product_id":"optolong-l-quad-enhance-filter","title":"Optolong L-Quad Enhance Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eQuad-bandpass design for color cameras\u003c\/li\u003e\n\u003cli\u003eSuppresses light pollution with OD2-OD4 blocking depth\u003c\/li\u003e\n\u003cli\u003eMaintains sharpness with a λ\/4 transmitted wavefront\u003c\/li\u003e\n\u003cli\u003eConstructed from 1.85mm thick optical glass\u003c\/li\u003e\n\u003cli\u003eEnsures no double images with 30s parallelism\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\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\u003eOptolong L-Quad Enhance Filter\u003c\/h2\u003e\n\u003cp\u003eThe Optolong L-Quad Enhance Filter is a specialized quad-bandpass light pollution filter for one-shot-color cameras, built on a 1.85mm optical glass substrate. It delivers deep suppression of artificial and natural skyglow with an optical density of OD2-OD4 across a broad 300-1000nm blocking range, isolating key celestial emission lines while preserving broadband color. With a transmitted wavefront held to λ\/4 and parallelism of 30 arcseconds, the L-QEF maintains sharp, detailed star images across the entire field.\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\u003eQuad-Bandpass Light Pollution Suppression at OD2-OD4\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically for color cameras, the L-Quad Enhance Filter utilizes four precisely defined bandpasses to combat light pollution. With a blocking depth of OD2 to OD4, it eliminates between 99% and 99.99% of unwanted wavelengths from sources like mercury and sodium streetlights, dramatically increasing the contrast between your target and the sky background. This aggressive suppression allows you to capture clean data even from suburban locations or under moonlight.\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\u003eλ\/4 Wavefront for Broadband Targets like Galaxies \u0026amp; Clusters\u003c\/h3\u003e\n\u003cp\u003eUnlike narrowband filters that isolate only emission lines, the L-QEF is engineered to capture both nebulae and broadband targets. Its passbands are chosen to preserve the continuous spectrum of galaxies and the subtle star colors in clusters, providing a more natural color balance directly out of the camera. The guaranteed λ\/4 transmitted wavefront ensures that the filter does not introduce optical errors, preserving the sharpness required to resolve fine details in targets like the Sculptor Galaxy (NGC 253) or the stars of the Double Cluster (NGC 869\/884).\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\u003e30s Parallelism for Pinpoint Stars Across the Field\u003c\/h3\u003e\n\u003cp\u003eOptical precision is critical in any filter, and the L-QEF is held to strict mechanical tolerances. A parallelism of 30 arcseconds guarantees that the two faces of the filter are almost perfectly parallel. This prevents the introduction of image shift or distorted stars, ensuring that pinpoint stellar images from your telescope's optics remain perfectly round and sharp from edge to edge.\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\u003eDurable Ion-Assisted Coatings on 1.85mm Substrate\u003c\/h3\u003e\n\u003cp\u003eThe L-Quad Enhance Filter's multi-layer coatings are applied using an advanced ion-assisted deposition process. This technology creates a dense, durable, and scratch-resistant surface that is easy to clean and maintains its spectral performance over time. Built on a 1.85mm thick optical glass substrate with a 60\/40 surface quality, the filter is parfocal with other standard astronomy filters, minimizing the need to refocus when using a filter wheel.\u003c\/p\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\"\u003eHow does the Optolong L-Quad Enhance Filter differ from a dual-band nebula filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA dual-band filter typically isolates only the H-alpha and OIII emission lines, which is ideal for emission nebulae but can result in unnatural colors for broadband targets like galaxies and star clusters. The \u003cstrong\u003eOptolong L-Quad Enhance Filter\u003c\/strong\u003e uses four passbands, which allows it to capture a more complete spectrum, resulting in better color balance for all types of deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong L-Quad Enhance Filter to image the Sculptor Galaxy (NGC 253) from a suburban backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an excellent use case for the \u003cstrong\u003eL-QEF\u003c\/strong\u003e. The filter is specifically designed to suppress common forms of light pollution while preserving the continuous spectrum of galaxies. It will help darken the sky background and increase the contrast of NGC 253's dust lanes and star-forming regions, making it possible to capture a high-quality image from light-polluted areas.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Optolong L-QEF perform on the North American Nebula (NGC 7000) with a one-shot-color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eL-QEF\u003c\/strong\u003e will perform very well. For large emission nebulae like the North American Nebula, the filter will isolate the critical red (H-alpha) and blue-green (H-beta\/OIII) wavelengths while blocking skyglow. This dramatically boosts the nebula's contrast against the background, revealing faint structures and details that would otherwise be lost.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the L-Quad Enhance Filter produce halos around bright stars?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOptolong L-Quad Enhance Filter\u003c\/strong\u003e is designed with advanced anti-reflection coatings to minimize halos and other internal reflections around bright stars. User tests confirm that it controls halos effectively, producing clean stellar profiles even on challenging targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the λ\/4 wavefront specification mean for my images with the L-QEF?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003eλ\/4 (1\/4 wave) transmitted wavefront\u003c\/strong\u003e is a measure of optical flatness and precision. It guarantees that the filter will not degrade the quality of the light passing through it, preserving the sharpness and resolution delivered by your telescope. This is crucial for capturing fine details and maintaining tight, point-like stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Optolong L-Quad Enhance Filter suitable for imaging under a full moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, while no filter can eliminate all moonlight, the \u003cstrong\u003eL-Quad Enhance Filter's\u003c\/strong\u003e strong suppression of background skyglow makes it highly effective at mitigating the impact of the Moon. It allows you to continue imaging on nights that would otherwise be unusable, significantly increasing your opportunities to capture data.\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\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eOptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003eOD2-OD4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"2\" Mounted","offer_id":50289892688157,"sku":"OPT-14702","price":278.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Quad-Enhance-Filter.jpg?v=1756170392"},{"product_id":"optolong-l1-dual-combo-set","title":"Optolong L-Quad Enhance + L-Para L1 Dual-Combo Filter Set - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eL-Quad Enhance Filter:\u003c\/strong\u003e A quad-bandpass filter designed for balanced RGB color from broadband targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL-Para L1 Filter:\u003c\/strong\u003e A dual-narrowband filter that isolates H-alpha and OIII emission lines for high-contrast detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroadband-Narrowband Synergy:\u003c\/strong\u003e A two-filter system designed for capturing separate color and detail data to be combined in post-processing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized for Fast Optics:\u003c\/strong\u003e The L-Para filter maintains excellent contrast and anti-halo characteristics even in fast optical systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIon-Assisted Coatings:\u003c\/strong\u003e Precision coatings ensure durability, scratch resistance, and stable central wavelength performance regardless of temperature changes.\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\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\u003eOptolong L-Quad Enhance + L-Para L1 Dual-Combo Filter Set - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Optolong L-Quad Enhance and L-Para L1 Dual-Combo Filter Set redefines color astrophotography by separating the capture of broadband color and narrowband detail into two specialized steps. This \"Broadband-Narrowband Synergy\" approach uses the L-Quad Enhance filter to acquire rich, natural RGB data from stars and galaxies, while the L-Para L1 dual-narrowband filter isolates the critical H-alpha and OIII emission lines that reveal the intricate structures within nebulae. By combining the data from both, you can produce images with vibrant, accurate color and deep, high-contrast details that are difficult to achieve with a single filter.\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\u003eL-Quad Enhance: A Broadband Filter for True-Color Imaging\u003c\/h3\u003e\n\u003cp\u003eThe L-Quad Enhance is a quad-bandpass filter engineered to capture continuous-spectrum objects with superior color fidelity, even from light-polluted skies. It preserves the natural RGB color balance of targets like the Andromeda Galaxy (M31) or star clusters, improving overall contrast and making your subjects appear more vivid. This filter acts as the color foundation of your image, ensuring stars and galactic structures retain their true appearance.\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\u003eL-Para: Isolating Hα \u0026amp; OIII for Maximum Nebula Detail\u003c\/h3\u003e\n\u003cp\u003eThe L-Para is a dual-narrowband filter that selectively passes H-alpha and Oxygen-III emission lines, the two most important wavelengths for revealing the structure of emission nebulae. It is designed to deliver excellent contrast and anti-halo performance, making it highly effective even with very fast optical systems. By isolating these specific signals, the L-Para captures the fine, filamentary details and ionized gas morphology in targets like the Lagoon Nebula (M8) or Horsehead Nebula (B33).\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\u003eThe Synergy Workflow: Fusing Broadband Color with Narrowband Data\u003c\/h3\u003e\n\u003cp\u003eThis two-filter set enables a powerful imaging workflow. You use the L-Quad Enhance to shoot your primary RGB frames, capturing the broadband color data. You then switch to the L-Para to gather dedicated H-alpha and OIII data. In post-processing software like PixInsight or Photoshop, these separate data sets are combined, allowing the rich color from the L-Quad to be layered with the sharp, high-contrast details from the L-Para, creating a final image with exceptional depth and clarity.\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\u003eDual-Filter Strategy vs. a Single Multi-Bandpass Filter\u003c\/h3\u003e\n\u003cp\u003eWhile a single tri- or quad-band filter captures all wavelengths simultaneously, this dual-filter strategy offers greater control and optimization. You can dedicate more imaging time to capturing the faint Hα and OIII signals with the L-Para, without overexposing the broadband data. This separation allows you to independently control the signal-to-noise ratio of your color and detail layers, giving you more flexibility in processing to achieve a customized final result.\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\u003eIon-Assisted Coatings for Wavelength Stability and Durability\u003c\/h3\u003e\n\u003cp\u003eBoth Optolong filters are manufactured using an ion-assisted deposition coating process. This advanced technique creates a dense, durable, and scratch-resistant surface. Critically, it ensures the central wavelength (CWL) of the filter passbands does not shift with temperature changes during an imaging session, providing consistent, reliable data from dusk till dawn.\u003c\/p\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 is the main advantage of the Optolong L-Quad + L-Para set over a single filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis set offers superior \u003cstrong\u003eprocessing flexibility\u003c\/strong\u003e. By capturing broadband color (with the L-Quad) and narrowband detail (with the L-Para) separately, you have independent control over each data stream. This allows you to optimize exposure times for faint nebula structures without compromising natural star color, leading to a more dynamic and detailed final image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the Optolong dual-filter set on the Trifid Nebula (M20)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Trifid Nebula is a perfect target for this set. You would use the \u003cstrong\u003eL-Quad Enhance\u003c\/strong\u003e filter to capture the blue reflection nebula and the surrounding starfield in true color. Then, you would switch to the \u003cstrong\u003eL-Para filter\u003c\/strong\u003e to gather deep exposures of the red H-alpha emission regions. Combining these in post-processing will showcase both the vibrant reflection and emission components with maximum detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the L-Para filter in this Optolong set suitable for my fast f\/2 RASA or Hyperstar system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The L-Para filter is specifically designed to perform exceptionally well with fast optical systems. It maintains high transmission for the H-alpha and OIII lines while controlling halos, ensuring you can capture high-contrast, detailed images of nebulae even with very short focal ratios.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong L-Quad Enhance filter by itself for galaxies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The L-Quad Enhance filter is an excellent standalone filter for broadband targets like galaxies and star clusters. It works as a light pollution filter that provides a much more natural color balance than typical multi-bandpass nebula filters, making it ideal for capturing continuous-spectrum objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of objects benefit most from the Optolong L-Para filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe L-Para filter excels on \u003cstrong\u003eemission nebulae\u003c\/strong\u003e. These are objects rich in ionized hydrogen (H-alpha) and oxygen (OIII). Prime targets include the Rosetta Nebula (NGC 2237), the Veil Nebula complex, and the North America Nebula (NGC 7000), where the filter will dramatically increase contrast and reveal faint structures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"CWL stability\" mean for these Optolong filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCWL stands for Central Wavelength. \"CWL stability\" means the filter's passbands will not drift or change even as the ambient temperature fluctuates throughout the night. This is ensured by Optolong's advanced coating technology and results in more consistent and reliable data collection during long imaging sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":50341802574109,"sku":"OPT-L1-SET","price":558.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L1-Dual-Combo-Set.jpg?v=1757558556"},{"product_id":"svbony-uhc-ultra-high-contrast-light-pollution-filter","title":"SVBONY UHC Ultra High Contrast Light Pollution Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces light pollution from artificial lighting\u003c\/li\u003e\n\u003cli\u003eEnhances contrast for emission nebulae\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\", 2\", and Canon EOS-C formats\u003c\/li\u003e\n\u003cli\u003eDurable aluminum frame with high-quality optical glass\u003c\/li\u003e\n\u003cli\u003eIncludes a protective storage case\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\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\u003eSvbony UHC Filter for Light Pollution Reduction\u003c\/h2\u003e\n\u003cp\u003eThe Svbony UHC Filter, available in 1.25\", 2\", and EOS-C formats, isolates critical nebular emission lines from city light pollution. This Ultra High Contrast design significantly darkens the sky background, making faint structures in objects like the Orion Nebula (M42) visible even from suburban locations. By selectively filtering out disruptive wavelengths from sodium and mercury vapor lamps, it restores the deep-sky views lost to urban glow.\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\u003eDefeating Light Pollution: The UHC Advantage\u003c\/h3\u003e\n\u003cp\u003eThe core function of the Svbony UHC filter is to create a starker contrast between your target nebula and the sky. It achieves this by selectively rejecting the most common wavelengths associated with artificial streetlights and other urban light sources. This surgical removal of unwanted light darkens the sky background without eliminating the key hydrogen-beta and oxygen-III wavelengths emitted by planetary and emission nebulae.\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\u003eMaximizing Contrast on Emission Nebulae\u003c\/h3\u003e\n\u003cp\u003eThis filter is a specialized tool designed to make emission nebulae \"pop\" in the eyepiece or on a camera sensor. For visual observers in light-polluted areas, faint objects like the Lagoon Nebula (M8) or the Swan Nebula (M17) transform from indistinct smudges into structured objects with discernible detail. The filter effectively boosts the signal-to-noise ratio, revealing faint wisps of nebulosity that are otherwise completely washed out by the skyglow.\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\u003eBuilt for Durability in Multiple Formats\u003c\/h3\u003e\n\u003cp\u003eConstructed with a durable, black-anodized aluminum frame and high-quality optical glass, the Svbony UHC filter is built for repeated use in the field. The filter is available in multiple formats to suit your equipment: standard 1.25\" and 2\" barrels that thread into most eyepieces and accessories, and a clip-in EOS-C model for Canon DSLR astrophotography. Each filter ships in a sturdy, transparent case to protect it from dust and scratches during storage and transport.\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\u003eSvbony UHC vs. CLS Filters: Choosing the Right Tool\u003c\/h3\u003e\n\u003cp\u003eWhile both UHC and CLS (City Light Suppression) filters fight light pollution, they serve different purposes. A CLS filter is a more broadband option, which is better for maintaining natural star colors and viewing a wider variety of objects, including galaxies and reflection nebulae.\u003c\/p\u003e\n\u003cp\u003eThe Svbony UHC filter is more aggressive and has a narrower bandpass. This results in a much darker sky and higher contrast specifically on emission nebulae, but it comes at the cost of dimming stars more significantly and altering their color. For pulling the faintest details out of planetary and emission nebulae, the UHC is the superior choice; for general-purpose skyglow reduction, a CLS may be more suitable.\u003c\/p\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 is the main difference between the Svbony UHC and a CLS filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eSvbony UHC (Ultra High Contrast) filter\u003c\/strong\u003e is a narrowband filter that provides maximum contrast on emission and planetary nebulae by aggressively blocking most light pollution. A \u003cstrong\u003eCLS (City Light Suppression) filter\u003c\/strong\u003e is more broadband, offering milder light pollution reduction but better performance on galaxies and clusters, with more natural star colors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Svbony UHC filter improve my view of the Orion Nebula (M42) with an 8\" SCT from the suburbs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFrom a suburban backyard, an 8\" SCT will show the core of the Orion Nebula (M42), but the outer loops of nebulosity are often lost in the skyglow. The Svbony UHC filter will dramatically darken the background sky, making the faint, extended wings of the nebula stand out clearly and revealing more intricate detail within the Trapezium region.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Svbony UHC filter for photographing the North American Nebula (NGC 7000) with a DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Svbony UHC filter is an excellent choice for DSLR imaging of large H-alpha regions like the North American Nebula (NGC 7000). The EOS-C clip-in version is specifically designed for this purpose. It will help separate the nebula's faint red glow from a light-polluted background, allowing you to use longer exposures to capture more detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Svbony UHC filter make galaxies or star clusters brighter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it will make them fainter. Galaxies and star clusters are broadband objects, meaning they emit light across the entire visible spectrum. Because the UHC filter blocks large portions of this spectrum to fight light pollution, it will dim these objects. This filter is specifically designed for emission and planetary nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich Svbony UHC filter format (1.25\", 2\", or EOS-C) do I need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe choice depends on your equipment:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25\" Filter:\u003c\/strong\u003e For use with standard 1.25\" eyepieces and accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" Filter:\u003c\/strong\u003e For use with larger 2\" eyepieces and accessories, typically for wide-field views.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEOS-C Filter:\u003c\/strong\u003e A clip-in filter designed to fit inside the body of a Canon DSLR camera with an APS-C sensor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow should I clean my Svbony UHC filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, use a blower bulb to remove any loose dust. If smudges or fingerprints remain, gently wipe the surface in a circular motion with a clean microfiber cloth and a few drops of a dedicated optical cleaning solution. Avoid using harsh chemicals or abrasive materials.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\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\"\u003eSvbony UHC Filter (Selected Size)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Storage Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSvbony 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861233955101,"sku":"SV-F9131A","price":34.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861233987869,"sku":"SV-F9131B","price":60.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C Clip-In","offer_id":52861234020637,"sku":"SV-F9131D","price":70.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-UHC-Filter-1-25-2-EOS-C-Light-Pollution-Telescope-Photography-1_f10b7e09-bcc9-447c-833a-018f1dfba599.jpg?v=1788660034"},{"product_id":"svbony-cls-light-pollution-broadband-filter","title":"SVBONY CLS Light Pollution Broadband Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBroadband Light Pollution Suppression\u003c\/li\u003e\n\u003cli\u003eEffectively Blocks Sodium and Mercury Vapor Streetlights\u003c\/li\u003e\n\u003cli\u003eHigh Transmission on Key Nebula Emission Lines\u003c\/li\u003e\n\u003cli\u003eOptimized for Color Cameras and Unmodified DSLRs\u003c\/li\u003e\n\u003cli\u003eDurable, Scratch-Resistant Optical Coatings\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\", 2\", and EOS-C Formats\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\u003eSvbony CLS Light Pollution Filter\u003c\/h2\u003e\n\u003cp\u003eThe Svbony CLS Filter is a broadband light pollution filter designed to dramatically increase the contrast of deep-sky objects when imaging from urban and suburban skies. By selectively blocking common sources of artificial skyglow, such as sodium and mercury vapor streetlights, it reveals faint nebula structures that would otherwise be lost. This filter is an essential tool for astrophotographers using color CCD cameras or unmodified DSLRs, isolating key emission wavelengths to make targets like the Orion Nebula (M42) stand out against a darker background.\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\u003eSvbony CLS: Suppressing Sodium \u0026amp; Mercury Vapor Skyglow\u003c\/h3\u003e\n\u003cp\u003eThe primary role of the Svbony CLS (City Light Suppression) filter is to reject the most common wavelengths of light pollution. It aggressively targets the spectral lines produced by sodium and mercury-vapor lamps, the dominant sources of skyglow in most urban environments. This selective blocking darkens the sky background in your images, significantly improving the signal-to-noise ratio. The practical result is that you can capture longer exposures from your backyard before the sensor is overwhelmed by skyglow, revealing fainter details in your target.\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 Nebulae: Passing Hydrogen \u0026amp; Oxygen Emission Lines\u003c\/h3\u003e\n\u003cp\u003eWhile blocking unwanted light, the Svbony CLS filter allows the most important wavelengths for deep-sky imaging to pass through to your camera sensor. It is designed for high transmission of critical emission lines, including Hydrogen-alpha, Hydrogen-beta, Oxygen-III, and Sulphur-II. Since these are the specific wavelengths emitted by popular targets like the North American Nebula (NGC 7000) and the Lagoon Nebula (M8), the filter makes these objects \"pop\" with enhanced contrast and color saturation, even with an unmodified DSLR.\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\u003eAdvanced Coatings: Ion-Assisted Deposition for Longevity\u003c\/h3\u003e\n\u003cp\u003eSvbony utilizes an advanced electron-beam gun evaporation process with ion-assisted deposition to create the filter's multi-layer coatings. This technology produces a dense, durable, and scratch-resistant surface that ensures consistent performance for years without degradation. A planetary rotation system during the coating process guarantees excellent homogeneity across the filter, providing uniform transmission and blockage for sharp, high-contrast images from edge to edge.\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\u003eSvbony CLS vs. UHC Filters: Choosing the Right Tool for Your Sky\u003c\/h3\u003e\n\u003cp\u003eWhile both CLS and UHC (Ultra High Contrast) filters fight light pollution, they do so differently. A UHC filter is more aggressive, with a narrower passband focused almost exclusively on the Oxygen-III and Hydrogen-beta lines. This provides maximum contrast on planetary nebulae but can result in unnatural star colors.\u003c\/p\u003e\n\u003cp\u003eThe Svbony CLS filter's broader passband is a more balanced approach. It allows more light through, which yields more natural star colors and performs better on broadband targets like galaxies and reflection nebulae. For imagers with color cameras seeking a versatile, all-purpose light pollution filter, the Svbony CLS is often the superior starting point.\u003c\/p\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\"\u003eHow will the Svbony CLS filter improve my images of the Orion Nebula (M42) from my backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Svbony CLS filter will darken the sky background, making the faint, outer regions of the Orion Nebula (M42) more visible against the sky. It passes the critical Hydrogen-alpha and Oxygen-III wavelengths that the nebula emits, which increases the contrast and color saturation of the nebula itself while suppressing the orange glow from city lights.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have an unmodified Canon DSLR. Is the Svbony CLS EOS-C filter a good choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the EOS-C clip-in version is specifically designed for this purpose. An unmodified DSLR has a stock filter that blocks much of the red Hydrogen-alpha light. The Svbony CLS filter helps by increasing the contrast of all other nebula emission lines that your camera *can* see, making it a highly effective upgrade for imaging emission nebulae without modifying your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main difference between this Svbony CLS filter and a UHC filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main difference is the width of the bandpass. The \u003cstrong\u003eSvbony CLS filter\u003c\/strong\u003e is a broadband filter, allowing a wider range of light through, which results in more natural star colors and better views of broadband targets like galaxies. A \u003cstrong\u003eUHC (Ultra High Contrast) filter\u003c\/strong\u003e has a much narrower bandpass, offering higher contrast on specific emission nebulae but at the cost of less natural colors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Svbony CLS filter help with imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, to an extent. Galaxies like Andromeda (M31) are broadband targets, meaning they emit light across the entire visible spectrum. The Svbony CLS filter helps by reducing the overall skyglow, which can improve contrast. However, because it also blocks parts of the galaxy's own light, the effect is less dramatic than on an emission nebula. It is still a major improvement over using no filter from a light-polluted location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Svbony CLS filter change the color of stars in my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, any light pollution filter will introduce a color cast. The Svbony CLS filter produces a milder, typically blue-green cast compared to narrower filters. This is easily corrected during image processing with a proper white balance adjustment to restore natural star colors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I clean my Svbony CLS filter without damaging the coatings?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, use a rocket air blower to remove any loose dust or particles. If smudges remain, apply a few drops of a dedicated lens cleaning solution to a fresh, lint-free microfiber cloth or optical wipe. Gently wipe the filter in a circular motion from the center outwards. Never apply cleaning fluid directly to the filter itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSvbony 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861235167517,"sku":"SV-F9155A","price":31.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861235200285,"sku":"SV-F9155B","price":53.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C Clip-In","offer_id":52861235233053,"sku":"SV-F9155D","price":74.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-CLS-Filter-1-25-2-EOS-C-Light-Pollution-Telescope-Photography-1_16a7895a-4a91-4dd8-87d0-9378345d7518.jpg?v=1788660078"},{"product_id":"svbony-sv240-near-infrared-multi-narrowband-light-pollution-filter","title":"SVBONY SV240 Near-Infrared Multi-Narrowband Light Pollution Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned for urban astrophotography with one-shot color cameras\u003c\/li\u003e\n\u003cli\u003ePasses H-Alpha, OIII, H-Beta, and Near-Infrared (NIR) wavelengths\u003c\/li\u003e\n\u003cli\u003ePeak transmittance over 95% for H-Alpha (656.3nm) and H-Beta (486.1nm)\u003c\/li\u003e\n\u003cli\u003eFeatures a wide 115nm FWHM bandpass in the NIR spectrum\u003c\/li\u003e\n\u003cli\u003eStandard 2-inch (M48x0.75) threaded cell\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\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\u003eSvbony SV240 2\" NIR Multi Narrowband Filter\u003c\/h2\u003e\n\u003cp\u003eThe Svbony SV240 2\" NIR Multi Narrowband Filter is engineered for one-shot color imaging from light-polluted urban skies, capturing four critical spectral regions in a single exposure. This filter delivers peak transmittance of over 95% at H-Alpha (656.3nm) and H-Beta (486.1nm), and over 92% for OIII (495.9nm), while simultaneously opening a 115nm-wide window in the near-infrared with an average transmission greater than 95% between 830-870nm. Its 2mm substrate thickness and 1\/4λ surface parallelism ensure your optical system's sharpness is maintained, all within a standard M48x0.75 threaded cell.\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\u003eTriple-Bandpass Design: Over 92% Transmission on Key Nebula Lines\u003c\/h3\u003e\n\u003cp\u003eThe core of the SV240 is its ability to isolate the three most important emission nebula spectral lines from the glare of city lights. With a peak transmission of \u0026gt;95% at H-Alpha (656.3nm), \u0026gt;92% at OIII (495.9nm), and \u0026gt;95% at H-Beta (486.1nm), the filter gathers maximum signal from your target. This high transmission is paired with aggressive blocking of common light pollution sources, achieving \u0026gt;OD4 suppression in the 560-620nm range, effectively eliminating the orange glow from sodium vapor lamps.\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 115nm Near-Infrared Window for Modern CMOS Sensors\u003c\/h3\u003e\n\u003cp\u003eUnlike traditional tri-band filters, the SV240 includes a fourth, wide passband in the near-infrared, spanning 830-870nm with an average transmission over 95%. This 115nm FWHM window is designed to leverage the high quantum efficiency of modern color CMOS sensors (like the Sony IMX585 and IMX464) in the NIR region. By capturing this additional signal, which is less affected by artificial light pollution, you can significantly boost the signal-to-noise ratio and contrast of your final image without complex processing. Note that imaging in the NIR band can sometimes introduce halos around bright stars, a known trade-off for the increased signal.\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\u003e2mm Substrate and 1\/4λ Parallelism for Sharp Stars\u003c\/h3\u003e\n\u003cp\u003eOptical precision is maintained by constructing the SV240 from a 2mm thick substrate with a surface parallelism of 1\/4λ. This ensures the filter will not introduce a significant focus shift or degrade the sharpness of your starfield, even in fast optical systems. The filter is housed in a standard 2-inch cell with M48x0.75 threads, making it compatible with most filter wheels, drawers, and camera nosepieces, while the 44mm clear aperture prevents vignetting on larger sensors.\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\u003eSvbony SV240 vs. SV220: Adding the H-Beta and NIR Bands\u003c\/h3\u003e\n\u003cp\u003eThe SV240 represents a significant evolution from a standard dual-bandpass filter like the Svbony SV220. While the SV220 is highly effective at isolating H-Alpha and OIII, the SV240 expands on this capability in two key ways.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eH-Beta Passband:\u003c\/strong\u003e The SV240 adds a dedicated passband for Hydrogen-Beta, crucial for capturing the full color and detail in objects like the Horsehead Nebula (Barnard 33) and California Nebula (NGC 1499).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNear-Infrared (NIR) Window:\u003c\/strong\u003e The SV240's primary advantage is its 115nm-wide NIR passband. This feature is specifically designed for modern color cameras highly sensitive to NIR light, allowing you to gather more signal data from a broader range of targets, including galaxies and star-forming regions, than is possible with the SV220.\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\"\u003eHow does the Svbony SV240 filter's NIR band help with imaging the Orion Nebula (M42) from the city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Orion Nebula (M42) has strong emissions in H-Alpha, OIII, and H-Beta, which the \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e captures with \u0026gt;92% transmission. The added 115nm-wide NIR band captures additional signal from the star-forming regions deep within the nebula. Since urban light pollution has less impact in the NIR, this fourth band boosts your overall signal-to-noise ratio, revealing fainter details than a traditional tri-band filter could from the same location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Svbony SV240 a good choice for my color camera with an IMX585 sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is an excellent choice. The \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e was specifically designed with sensors like the Sony IMX585 in mind. These modern CMOS chips have very high quantum efficiency in the near-infrared. The filter's \u0026gt;95% average transmission in the 830-870nm range is designed to leverage this sensitivity, allowing you to collect significantly more data and achieve higher-contrast images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between the SV240 and a standard UHC or CLS filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUHC and CLS (City Light Suppression) filters are broadband filters that pass a much wider range of the spectrum, which can still let significant light pollution through. The \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e is a multi-narrowband filter with much tighter bandpasses (20nm and 24nm for OIII\/H-Beta and H-Alpha) that isolate specific emission lines with high precision. This results in much darker skies, higher contrast on nebulae, and the ability to image from more heavily light-polluted areas.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV240 filter with my 8\" f\/4 Newtonian for imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While galaxies like Andromeda (M31) are broadband targets, the \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e can still be very effective. It will capture the H-Alpha signal from the star-forming regions in the galaxy's spiral arms while suppressing city glow. The NIR band is also beneficial, as it captures signal from the older, redder star populations in the galactic core. The filter's 1\/4λ parallelism ensures it performs well with your fast f\/4 optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Svbony SV240 have three different FWHM values (24nm, 20nm, 115nm)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe different Full-Width Half-Maximum (FWHM) values correspond to the different passbands of the \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e filter. The 24nm and 20nm bandpasses are for the visible light emission lines (H-Alpha, H-Beta, OIII), providing a tight but manageable window for capturing nebula detail. The much wider 115nm FWHM is for the near-infrared (NIR) band, designed to gather as much signal as possible from this region where modern sensors are highly sensitive.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to refocus when using the 2mm thick Svbony SV240 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eSvbony SV240\u003c\/strong\u003e uses a 2mm thick substrate, which is a common standard. While any filter will shift the focal point slightly, a 2mm thickness is generally considered \"parfocal\" with many other modern filters. The shift will be minimal, but for critical sharpness, especially in fast telescopes, it is always best practice to check and refine focus after inserting any filter into the optical path.\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\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eMulti-Narrowband Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV240\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e300-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM\u003c\/td\u003e\n\u003ctd\u003e24nm \u0026amp; 20nm \u0026amp; 115nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003eT＞95%@656.3nm (H-α)\u003cbr\u003eT＞95%@486.1nm (H-β)\u003cbr\u003eT＞92%@495.9nm (OIII)\u003cbr\u003eT\u0026gt;85%@500.7nm (OIII)\u003cbr\u003eTavg\u0026gt;95%@830-870nm (NIR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD5 @ 300-450nm\u003cbr\u003e\u0026gt;OD4 @ 560-620nm\u003cbr\u003e\u0026gt;OD2 @ 690-750nm\u003cbr\u003e\u0026gt;OD3 @ 940-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Parallelism\u003c\/td\u003e\n\u003ctd\u003e1\/4λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle Thread\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e12.5g \/ 0.44oz\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861237199133,"sku":"SV-W9191B","price":126.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861237231901,"sku":"SV-W9191A","price":168.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV240-1-25-Multi-Narrowband-Filter-for-Urban-Astrophotography-1_9a989526-8ef6-408f-827e-43d86ba7f618.jpg?v=1788660312"},{"product_id":"svbony-sv260-5-bandpass-light-pollution-filter-2in","title":"SVBONY SV260 5-Bandpass Light Pollution Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e5-Bandpass broadband light pollution filter\u003c\/li\u003e\n\u003cli\u003e2-inch size with M48x0.75 thread\u003c\/li\u003e\n\u003cli\u003eOver 90% peak transmittance for high signal\u003c\/li\u003e\n\u003cli\u003eOD4 blocking of key light pollution bands\u003c\/li\u003e\n\u003cli\u003e44mm clear aperture to minimize vignetting\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\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\u003eSvbony SV260 5 Bandpass Light Pollution Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Svbony SV260 5 Bandpass Filter uses a multi-broadband design to reclaim the deep sky from city lights, achieving over 90% peak transmittance to preserve natural color in galaxies and star clusters. Its optical design provides greater than OD4 blocking on critical light pollution sources while maintaining a wide 300-1000nm wavelength range. The 2-inch cell features a full 44mm clear aperture, ensuring unvignetted coverage for large-format CMOS and CCD sensors.\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\u003eOD4 Blocking: Isolating Specific Light Pollution Sources\u003c\/h3\u003e\n\u003cp\u003eThe SV260's primary function is to surgically remove the most common wavelengths of artificial skyglow. It achieves an Optical Density (OD) of 4 or greater in the 350-400nm and 720-1100nm ranges, effectively blocking over 99.99% of unwanted light from these sources. Specific high-pressure sodium (Na) and mercury (Hg) vapor streetlight emissions are heavily suppressed, darkening the image background and dramatically increasing contrast on your target.\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\u003e5-Bandpass Design: Capturing Full-Spectrum Color at 90% Transmittance\u003c\/h3\u003e\n\u003cp\u003eUnlike narrowband filters that isolate single emission lines, the SV260 passes light in five distinct bands across the spectrum. This approach allows the faint, continuous spectra of broadband targets—such as the dusty arms of a galaxy or the blue glow of a reflection nebula—to reach your sensor. With a peak transmittance of over 90%, the filter maximizes the signal you want to capture, resulting in shorter total integration times and images with more accurate, vibrant color balance.\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\u003eOptical Build: A 44mm Clear Aperture for Modern Sensors\u003c\/h3\u003e\n\u003cp\u003eEngineered for modern imaging systems, the SV260 is built into a standard 2-inch filter cell with M48x0.75 threads for universal compatibility with filter wheels and camera nosepieces. The filter features a generous 44mm clear aperture, which is critical for preventing vignetting on cameras with APS-C or larger sensors. The 2mm substrate thickness maintains optical precision, with a surface parallelism of 1\/2λ to avoid introducing distortions into the light path.\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\u003eSV260 vs. Narrowband Filters: Choosing Natural Color Over Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eAn imager's choice of filter depends entirely on the target. The SV260 excels where narrowband filters fall short.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroadband Targets:\u003c\/strong\u003e For galaxies like Andromeda (M31), reflection nebulae like the Pleiades (M45), and globular clusters like M13, the SV260 is the correct tool. It preserves the natural stellar colors and faint outer structures that narrowband imaging completely misses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission Nebulae:\u003c\/strong\u003e For targets dominated by Hydrogen-alpha and Oxygen-III, such as the North American Nebula (NGC 7000), a dedicated narrowband or dual-band filter will provide higher contrast. The trade-off is the loss of natural star color and the need for complex color mapping in processing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe SV260 is designed for one-shot-color cameras, delivering a more authentic representation of the night sky directly from your data, making it an essential tool for capturing the full diversity of deep-sky objects.\u003c\/p\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 kind of objects is the Svbony SV260 filter best for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Svbony SV260 is a broadband filter designed for deep-sky objects that emit light across a wide spectrum. It is ideal for imaging \u003cstrong\u003egalaxies, star clusters (both open and globular), and reflection nebulae\u003c\/strong\u003e, where preserving natural color and capturing faint starlight is the primary goal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV260 perform on the Andromeda Galaxy (M31) from a suburban backyard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV260 is an excellent choice for imaging M31 from light-polluted areas. It will significantly darken the sky background by blocking sodium and mercury vapor light, which increases the contrast of Andromeda's faint outer arms and dust lanes. Because it's a broadband filter, it will also preserve the true colors of the galaxy's core, star-forming regions, and surrounding starfield.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does OD4 blocking mean on the SV260 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD4\u003c\/strong\u003e stands for \u003cstrong\u003eOptical Density 4\u003c\/strong\u003e. This is a logarithmic scale that measures how much light is blocked. An OD4 rating means the filter transmits only 1\/10,000th (or 0.01%) of the light at that specific wavelength. The SV260's OD4 blocking on key light pollution bands ensures that unwanted artificial skyglow is almost entirely eliminated from your images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I use the Svbony SV260 or a UHC filter for the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis depends on your goal. The Orion Nebula (M42) has both strong emission regions (H-alpha, O-III) and a significant reflection component (the surrounding blue dust). A UHC (Ultra High Contrast) filter will provide more aggressive contrast on the glowing gas but will suppress the reflection nebula and alter star colors. The \u003cstrong\u003eSvbony SV260 will produce a more natural-looking image\u003c\/strong\u003e, capturing both the pinkish emission gas and the blue reflection dust with better color fidelity, making it a great choice for a true-color rendition of the entire complex.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 2-inch SV260 filter work with my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Svbony SV260 is well-suited for larger sensors. It features a \u003cstrong\u003e44mm clear aperture\u003c\/strong\u003e, which is larger than many standard 2-inch filters. This wide aperture helps prevent vignetting (darkening of the corners) on cameras with sensors up to and including full-frame format, provided the rest of your optical train is also properly illuminated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Svbony SV260 replace the need for calibration frames?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not. While the SV260 controls light pollution and improves your raw data, you must still shoot calibration frames. \u003cstrong\u003eDarks, biases, and especially flats are still required\u003c\/strong\u003e to correct for sensor noise, dust motes, and any remaining gradients to achieve the best possible final image.\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\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eMulti-Broadband Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle Thread\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: UV\/IR\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD4 @ 350-400nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: IR\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD4 @ 720-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Mercury (Hg)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD2 @ 435.8nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Mercury (Hg)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD1 @ 546.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Mercury (Hg)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD3 @ 577nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Mercury (Hg)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD3 @ 578.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Sodium (Na)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD2 @ 589.6nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking: Neutral (Hg\/Na)\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;OD2 @ 589nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Parallelism\u003c\/td\u003e\n\u003ctd\u003e1\/2λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e12.5g \/ 0.44oz\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"2\" Round Mounted","offer_id":52861267214621,"sku":"SV-W9194A","price":175.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV260-5-Bandpass-Filter-Light-Pollution-Deep-Sky-Photography-1_eb6d63fd-a1dd-48d9-8cf5-41f43ca5546f.jpg?v=1788883781"},{"product_id":"explore-scientific-310260","title":"Explore Scientific Dark-Sky Filter 77mm Slim","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e77mm Standard Filter Thread\u003c\/li\u003e\n\u003cli\u003eSlim Profile Prevents Vignetting\u003c\/li\u003e\n\u003cli\u003eOptimized for Wide-Angle Lenses\u003c\/li\u003e\n\u003cli\u003eSuppresses Sodium Vapor Streetlight Glow\u003c\/li\u003e\n\u003cli\u003eEnhances Contrast for Aurora \u0026amp; Deep-Sky\u003c\/li\u003e\n\u003cli\u003eImproves Color Separation in Nebulae\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\u003eDark-Sky Filter 77mm Slim\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific Dark-Sky Filter 77mm Slim provides targeted light pollution suppression for any camera lens with a 77mm filter thread, isolating the yellow glow from sodium vapor streetlights to enhance contrast for aurora and deep-sky imaging.\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\u003eIsolate and Block Sodium Streetlight Glow\u003c\/h3\u003e\n\u003cp\u003eThis filter is engineered to selectively block the dominant wavelength of yellow light emitted by sodium vapor lamps, a primary source of urban skyglow. By removing this specific band of light pollution, the filter allows the natural reds and greens of emission nebulae and aurora to be recorded with greater fidelity and separation.\u003c\/p\u003e\n\u003cp\u003eThis targeted approach avoids the need for aggressive post-processing to remove color casts, preserving a more natural color balance directly in your original exposures. It allows you to capture even faint auroral displays from within city limits, where they would otherwise be lost in the glare.\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\u003eThe Wide-Angle Advantage: Why This 77mm Filter Outperforms CLS\/UHC\u003c\/h3\u003e\n\u003cp\u003eUnlike multi-band interference filters like CLS or UHC, the Dark-Sky filter's performance is not dependent on the angle of incoming light. This is a critical advantage for wide-angle astrophotography, where interference filters often produce severe color shifts and vignetting away from the center of the frame.\u003c\/p\u003e\n\u003cp\u003eYou can thread this filter directly onto the front of your fastest, widest lenses without complex adapters or fear of image degradation at the edges. Its slim, 4mm profile is specifically designed to prevent mechanical vignetting, ensuring your full frame remains illuminated for capturing expansive targets like the Milky Way or large constellations.\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\u003eBeyond Astronomy: Enhancing Red and Brown Tones\u003c\/h3\u003e\n\u003cp\u003eThe filter's properties also make it a useful tool for terrestrial photography. By reducing the yellow portion of the spectrum, it naturally enhances the separation and saturation of red and brown tones. This effect can be used to add dramatic contrast to sunsets, twilight colors, or the rich hues of autumn foliage, making it a versatile addition to any photographer's kit.\u003c\/p\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 kind of light pollution does the 77mm Dark-Sky Filter block best?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 77mm Dark-Sky Filter is specifically designed to target and suppress the yellow light emitted by \u003cstrong\u003esodium vapor lamps\u003c\/strong\u003e. These are the most common sources of street lighting and greenhouse illumination, making this filter highly effective at reducing urban and suburban skyglow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 77mm Dark-Sky Filter with a wide-angle lens for the Milky Way?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. This filter is ideal for wide-angle lenses. Unlike interference filters (like UHC\/CLS) that can cause color shifts on wide lenses, this filter provides consistent results across the entire frame. Its slim profile is also designed to prevent vignetting, even on ultra-wide lenses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is this 77mm Dark-Sky Filter different from a UHC or CLS filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary difference is its compatibility with wide-angle lenses. \u003cstrong\u003eUHC and CLS filters\u003c\/strong\u003e are interference-based and require light to pass through them at a near-perpendicular angle, which doesn't happen with wide lenses, causing color shifts. This Dark-Sky filter uses a different design that is not angle-dependent, making it superior for wide-field astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this filter add a strong color cast to my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. By selectively blocking only the narrow band of light associated with sodium streetlights, the filter is designed to deliver a more \u003cstrong\u003enatural color reproduction\u003c\/strong\u003e of the night sky. It helps you capture better source data, reducing the need for heavy color correction in post-processing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 77mm Dark-Sky Filter useful for photographing aurora from a city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The filter helps increase the contrast between the auroral display and the light-polluted sky. By suppressing the dominant sodium vapor glow, it can help you photographically detect and capture weaker aurora events that would otherwise be washed out by city lights.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 77mm filter for anything besides astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The filter's properties make it useful for certain types of terrestrial photography. It enhances the contrast and saturation of red and brown tones, which can be used to create more dramatic images of \u003cstrong\u003esunsets, twilight, and autumn leaves\u003c\/strong\u003e.\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\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003e77mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProfile\u003c\/td\u003e\n\u003ctd\u003eSlim\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":52909413105949,"sku":"ES-310260","price":252.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ExploreScientific-Dark-Sky-Filter-77mm-Slim-1_5eb47d28-e68e-4f7e-9ba1-6b9e60f8e125.jpg?v=1789061615"},{"product_id":"baader-planetarium-uhc-l-ultra-l-booster-filter-65x65mm","title":"Baader Planetarium UHC-L \/ Ultra-L-Booster Filter 65x65mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e65x65mm Unmounted Square Format\u003c\/li\u003e\n\u003cli\u003eOptimized for LED Light Pollution Rejection\u003c\/li\u003e\n\u003cli\u003eHigh-Contrast Views of Emission Nebulae\u003c\/li\u003e\n\u003cli\u003eIdeal Complement to Narrowband OIII Filters\u003c\/li\u003e\n\u003cli\u003eDesigned for Deep-Sky Observing and Imaging\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\u003eBaader UHC-L \/ Ultra-L-Booster Filter 65x65mm\u003c\/h2\u003e\n\u003cp\u003eThe Baader UHC-L \/ Ultra-L-Booster Filter is a specialized deep-sky tool in an unmounted 65x65mm format, specifically engineered to reject the blueish skyglow from modern LED streetlights and restore critical contrast on emission nebulae. Acting as the perfect visual complement to restrictive narrowband OIII filters, this 65x65mm filter reveals more structure in objects like the Veil Nebula (NGC 6960) and the Lagoon Nebula (M8).\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 Modern LED Light Pollution\u003c\/h3\u003e\n\u003cp\u003eUnlike traditional light pollution filters designed for the yellow-orange glow of sodium and mercury-vapor lamps, the Baader UHC-L is optimized to combat modern light sources. Its transmission characteristics are tailored to aggressively block the broad-spectrum, blue-rich light emitted by LED streetlights and vehicle headlights, which have become the dominant source of skyglow in many urban and suburban areas.\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\u003eMaximizing Contrast on Emission Nebulae\u003c\/h3\u003e\n\u003cp\u003eThis filter isolates the most important spectral lines for emission nebulae—Hydrogen-Beta (H-β) and doubly ionized Oxygen (OIII)—while blocking the interfering light between them. The result is a dramatically darkened sky background, causing faint nebular structures to stand out with significantly improved contrast. This makes the UHC-L an essential tool for observing and imaging sprawling HII regions and supernova remnants.\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\u003eThe UHC-L as a Visual Complement to Narrowband OIII\u003c\/h3\u003e\n\u003cp\u003eWhile a narrowband OIII filter excels at isolating planetary nebulae, it can suppress the H-Beta component crucial to the structure of other targets, like the Horsehead Nebula (B33). The Baader UHC-L filter passes both emission lines, providing a more complete and often brighter view. It serves as the ideal first-look filter, revealing the full extent of a nebula before you switch to a more restrictive filter for specific details.\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\u003eUnmounted 65x65mm Format for Advanced Imaging\u003c\/h3\u003e\n\u003cp\u003eThe large 65x65mm unmounted format is designed for serious astrophotographers using large-format sensors and specialized filter holders. This size prevents vignetting on cameras with large diagonals and allows for flexible integration into high-end filter wheels and sliders. Its unmounted design gives you the freedom to install it into the specific holder required by your imaging train.\u003c\/p\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 Baader 65x65mm UHC-L filter different from older light pollution filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eBaader UHC-L filter\u003c\/strong\u003e is specifically designed to combat modern, broad-spectrum LED light pollution, which emits a significant amount of blue light. Older filters were designed for the narrow emission lines of sodium and mercury vapor streetlights and are less effective against the \"blueish skyglow\" of today's cities.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use the Baader UHC-L filter instead of a narrowband OIII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUse the \u003cstrong\u003eUHC-L filter\u003c\/strong\u003e as your primary nebula filter for a brighter, more complete view of objects that emit strongly in both Oxygen-III and Hydrogen-Beta, such as the Orion Nebula (M42) or Lagoon Nebula (M8). Switch to a more restrictive OIII filter when you want maximum contrast on objects that are almost pure OIII, like most planetary nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Baader UHC-L filter improve my view of the Orion Nebula (M42) from a suburban location?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFrom a suburban sky, the \u003cstrong\u003eBaader UHC-L filter\u003c\/strong\u003e will dramatically darken the washed-out background sky, increasing the contrast of the nebula. This will allow you to see fainter outer loops of gas and more intricate detail within the Trapezium region that would otherwise be lost to local light pollution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 65x65mm UHC-L filter suitable for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the \u003cstrong\u003e65x65mm UHC-L filter's\u003c\/strong\u003e primary application is for imaging with large-format cameras, it can be used visually if you have a compatible filter holder, such as a 2-inch filter slider that accepts unmounted square filters. For standard eyepiece use, a mounted 2-inch round version is more practical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader 65x65mm UHC-L filter with my large-format camera and fast astrograph for imaging the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003e65x65mm format\u003c\/strong\u003e is ideal for this application. It is large enough to fully illuminate the large sensor in your camera without causing vignetting, even with a fast optical system. The filter will enhance the contrast of the nebula's rich hydrogen-alpha and hydrogen-beta regions against the light-polluted sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"unmounted\" mean for the 65x65mm UHC-L filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"Unmounted\" means the \u003cstrong\u003e65x65mm UHC-L filter\u003c\/strong\u003e is a square piece of optical glass without a threaded metal cell. You must install it into a compatible filter holder, such as a filter wheel or a filter drawer designed for large, square filters, before it can be placed in the optical path.\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\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter size\u003c\/td\u003e\n\u003ctd\u003e65 x 65 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter shape\u003c\/td\u003e\n\u003ctd\u003esquare\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle or Set?\u003c\/td\u003e\n\u003ctd\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter mounted\u003c\/td\u003e\n\u003ctd\u003eUnmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Usage\u003c\/td\u003e\n\u003ctd\u003eContrast Enhancement, Light Pollution Reduction, Luminance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Filter\u003c\/td\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thickness (without cell)\u003c\/td\u003e\n\u003ctd\u003e3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission Range\u003c\/td\u003e\n\u003ctd\u003emultiple bands (see spectral image)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003eReflex-Blocker™ hard coated, dielectrically coated, planeoptically polished\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Cleaning_and_Maintenance_of_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Cleaning and Maintenance of Optics Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":52913209344285,"sku":"BAA-2961566","price":561.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-UHC-L-Ultra-L-Booster-Filter-65x65mm-1_dadbf4bb-96f8-4bae-a9cf-a3908428f55e.jpg?v=1789088176"},{"product_id":"optolong-clear-sky-filter","title":"Optolong Clear Sky Light Pollution Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSuppresses common sources of urban light pollution\u003c\/li\u003e\n\u003cli\u003eEnhances contrast for deep-sky objects\u003c\/li\u003e\n\u003cli\u003eImproves natural color balance in astrophotography\u003c\/li\u003e\n\u003cli\u003eDurable, scratch-resistant Ion-assisted coatings\u003c\/li\u003e\n\u003cli\u003eAvailable in M77\/M82 lens thread and Nikon Z clip-in formats\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\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\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\u003eOptolong Clear Sky Light Pollution Filter\u003c\/h2\u003e\n      \u003cp\u003eThe Optolong Clear Sky Light Pollution Filter is engineered to reclaim the natural contrast and color of the night sky from light-polluted locations. By selectively blocking the most common wavelengths of artificial lighting, this filter allows the faint light from nebulae and galaxies to stand out against a darker background. It utilizes advanced ion-assisted deposition coatings to ensure durability and stable performance, making it an essential tool for DSLR and mirrorless camera astrophotography in urban and suburban environments.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eRestoring Natural Sky Contrast from the City\u003c\/h3\u003e\n      \u003cp\u003eShooting from a city or suburb washes out faint deep-sky objects, blending them into a bright, hazy background. The Optolong Clear Sky filter targets and suppresses the spectral lines of common streetlights and artificial skyglow, effectively darkening the sky without altering the natural color of stars and galaxies. This process dramatically enhances the contrast between your target and the background, revealing detail that would otherwise be lost.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eIon-Assisted Coatings for Durability and Color Fidelity\u003c\/h3\u003e\n      \u003cp\u003eOptolong employs a sophisticated ion-assisted deposition coating process to create a filter that is both effective and resilient. This technology produces a hard, scratch-resistant surface and ensures the central wavelength of the filter remains stable regardless of temperature changes during an imaging session. The precision and homogeneity of these coatings result in high transmission of desirable wavelengths, preserving true-to-life color balance for a more natural final image.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Optolong Clear Sky Filter improve astrophotography from a city?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Optolong Clear Sky Filter works by selectively blocking the most common wavelengths of light emitted by artificial sources like sodium and mercury-vapor streetlights. This darkens the sky background in your images, which significantly \u003cstrong\u003eincreases the contrast\u003c\/strong\u003e of celestial objects like galaxies and nebulae, making them stand out more clearly.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the Optolong Clear Sky filter and a stronger nebula filter like a UHC?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Clear Sky filter is a \u003cstrong\u003ebroadband light pollution filter\u003c\/strong\u003e, designed to improve contrast while maintaining natural star color, making it great for galaxies and star clusters. A UHC (Ultra High Contrast) filter is a \u003cstrong\u003enarrowband filter\u003c\/strong\u003e that passes only specific emission lines (like H-Beta and OIII), resulting in a much darker sky but also a significant color cast. UHC filters are specialized for emission nebulae, while the Clear Sky filter is more versatile.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Optolong Clear Sky Filter change the color of stars in my images?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe filter is designed to produce a natural color balance with minimal color cast. While any filter that removes parts of the spectrum will have some effect, the Optolong Clear Sky filter aims to preserve the natural coloration of stars and broadband targets like galaxies, making color correction in post-processing much simpler than with more aggressive narrowband filters.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I choose between the lens thread and clip-in versions of the Optolong Clear Sky Filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eChoose the version based on your equipment and needs:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eLens Thread (M77, M82):\u003c\/strong\u003e This type screws directly onto the front of your camera lens, just like a standard UV filter. It's ideal if you primarily use one or two lenses with the same filter thread size.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eClip-in Filter:\u003c\/strong\u003e This version fits inside the camera body, just behind the lens mount. This allows you to use the filter with \u003cstrong\u003eany lens\u003c\/strong\u003e compatible with your camera body (e.g., Nikon Z mount), which is more economical if you frequently switch between different lenses.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong Clear Sky Filter to photograph the Andromeda Galaxy (M31) from a suburban backyard?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, absolutely. The Andromeda Galaxy (M31) is a perfect target for this filter. As a broadband object (a galaxy made of stars), it benefits greatly from the increased contrast the Clear Sky filter provides against a light-polluted suburban sky, helping to reveal its faint outer arms and dust lanes without distorting its natural color.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Optolong Clear Sky Filter effective for shooting the Orion Nebula (M42) with a standard DSLR?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, the Optolong Clear Sky Filter is very effective for bright emission nebulae like the Orion Nebula (M42). It will help suppress local light pollution, making the faint, extended nebulosity more visible against a dark background while preserving the natural colors in the bright core and surrounding star field.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAvailable Mounting Options\u003c\/td\u003e\n\u003ctd\u003eM77 Lens Thread, M82 Lens Thread, Clip-in for Nikon Z Full Frame\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"M77 Lens Thread","offer_id":52941912113437,"sku":"OPT-10503","price":231.0,"currency_code":"CAD","in_stock":true},{"title":"M82 Lens Thread","offer_id":52941912146205,"sku":"OPT-10504","price":287.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Nikon Z Full Frame","offer_id":52941912178973,"sku":"OPT-CLEARSKY-NK-Z","price":139.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-Clear-Sky-Filter-Screw-on-Lens-1_70b48089-a026-41d6-a39c-0cb0db0499d1.jpg?v=1789592341"},{"product_id":"optolong-cls-filter","title":"Optolong CLS Light Pollution Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSuppresses common light pollution sources\u003c\/li\u003e\n\u003cli\u003eAverage transmission greater than 90% on key nebula emission lines\u003c\/li\u003e\n\u003cli\u003eBlocks light pollution lines with \u0026gt;99% efficiency\u003c\/li\u003e\n\u003cli\u003e1.85mm thick optical glass substrate\u003c\/li\u003e\n\u003cli\u003eλ\/4 transmitted wavefront and 30s parallelism\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\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\u003eOptolong CLS Light Pollution Filter\u003c\/h2\u003e\n\u003cp\u003eThe Optolong CLS (City Light Suppression) filter restores contrast to your deep-sky views by blocking over 99% of common artificial light sources. Built on a 1.85mm optical glass substrate, it maintains a λ\/4 transmitted wavefront for sharp images while delivering over 90% transmission of critical nebula emission lines like H-alpha and OIII. With 30s parallelism, the filter introduces no optical distortions, making it a powerful tool for visual observers and imagers using color cameras or unmodified DSLRs under suburban 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\u003eTargeted Light Pollution Suppression: \u0026gt;99% Blocking of Sodium \u0026amp; Mercury Lines\u003c\/h3\u003e\n\u003cp\u003eThe core function of the Optolong CLS is to surgically remove the wavelengths associated with common streetlights. It achieves greater than 99% blocking of mercury vapor, high-pressure sodium, and low-pressure sodium vapor lamp emissions. This aggressive rejection of unwanted light darkens the sky background significantly, allowing the faint signal from your target to stand out in much higher contrast.\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\u003eHigh-Transmission Broadband Design: \u0026gt;90% Pass-Through on Key Emission Lines\u003c\/h3\u003e\n\u003cp\u003eWhile blocking unwanted light, the CLS filter maintains an average transmission of over 90% for the most important deep-sky wavelengths. This wide passband includes hydrogen-alpha (656nm), hydrogen-beta (486nm), oxygen-III (496nm and 500nm), and sulfur-II (672nm). By preserving the light from these emission nebulae, the filter reveals more detail and structure in objects like the Orion Nebula (M42) or the Lagoon Nebula (M8) without significantly altering natural star colors.\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\u003ePrecision-Coated 1.85mm Glass: λ\/4 Wavefront and 30s Parallelism\u003c\/h3\u003e\n\u003cp\u003eOptolong constructs the CLS filter from a 1.85mm thick slab of fine optical glass, ensuring mechanical stability and optical purity. Ion-assisted deposition coatings provide durability and prevent the central wavelength from shifting with temperature changes. The filter is polished to a transmitted wavefront of λ\/4 and a parallelism of 30 arcseconds, guaranteeing that it will not degrade the resolution of your telescope's optics.\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\u003eOptolong CLS vs. UHC Filters: Choosing the Right Tool for Your Sky\u003c\/h3\u003e\n\u003cp\u003eThe CLS is often compared to Ultra High Contrast (UHC) filters. The primary difference is the width of the passband.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptolong CLS Filter:\u003c\/strong\u003e Features a wider passband, making it more effective in mild to moderate light pollution. It preserves more natural star color and is a better general-purpose filter for a mix of objects, including reflection nebulae and star clusters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUHC Filter:\u003c\/strong\u003e Has a narrower passband, primarily focused on the H-beta and OIII lines. This provides more aggressive contrast on emission nebulae but can dim stars more significantly. It is often preferred for darker sites or areas with more severe light pollution where maximum rejection is needed.\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 is the main difference between the Optolong CLS and a UHC filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOptolong CLS filter\u003c\/strong\u003e has a wider bandpass, making it a \"broadband\" filter ideal for mild to moderate light pollution. It passes more of the visible spectrum, resulting in more natural star colors. A UHC filter is a \"narrowband\" filter with a tighter passband, offering higher contrast on emission nebulae but at the cost of dimming stars more, making it better suited for more heavily light-polluted skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong CLS filter for imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but with limitations. Galaxies are broadband targets, meaning they emit light across the entire visible spectrum. The \u003cstrong\u003eOptolong CLS filter\u003c\/strong\u003e will increase the contrast between the galaxy and the skyglow, but it will also block some of the galaxy's own light. It can help bring out H-II regions in the spiral arms but may reduce the overall brightness of the galactic core.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Optolong CLS filter perform on the Orion Nebula (M42) from my suburban backyard with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOptolong CLS filter\u003c\/strong\u003e is an excellent choice for this scenario. M42 is rich in hydrogen-alpha and oxygen-III emissions, which the filter transmits with over 90% efficiency. In your 8\" SCT, the filter will dramatically darken the suburban sky background, making the faint outer loops of the nebula visible and enhancing the contrast and detail within the Trapezium region.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Optolong CLS filter suitable for an unmodified DSLR camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003eOptolong CLS filter\u003c\/strong\u003e is designed to work very well with color CMOS\/CCD cameras and unmodified DSLRs. Its passband includes the critical 656nm H-alpha line, which standard DSLRs are less sensitive to but still capture. The filter helps isolate this important wavelength from light pollution, improving the signal in your images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Optolong CLS filter make nebulae look brighter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is a common misconception. No filter can increase an object's actual brightness. The \u003cstrong\u003eOptolong CLS filter\u003c\/strong\u003e works by increasing the *contrast* between the nebula and the night sky. It achieves this by selectively blocking light pollution, which makes the background darker, thereby making the nebula easier to see against it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does my Optolong CLS filter look like a mirror and change colors?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is normal for an interference filter like the \u003cstrong\u003eOptolong CLS\u003c\/strong\u003e. The highly reflective appearance is due to the dielectric coatings that are precisely layered to reject specific wavelengths of light. The color will appear to shift depending on the viewing angle and ambient light, which is a sign that the coatings are functioning as designed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWARNING: Can I use the Optolong CLS filter for observing the Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eAbsolutely not.\u003c\/strong\u003e The Optolong CLS filter is NOT a solar filter and is not designed for sun observation. Looking at the Sun with this filter, or any filter not explicitly designed for safe solar viewing, will cause immediate and permanent blindness.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eBroadband Light Pollution Suppression (CLS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Mounted, 2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eOptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAverage Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e400-700nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;99% on light pollution lines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\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\"\u003eOptolong CLS Light Pollution Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":52941921288477,"sku":"OPT-11801","price":77.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":52941921321245,"sku":"OPT-11802","price":119.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-CLS-City-Light-Suppression-broadband-filter-is-designed-to-improve-the-visibility-of-various-deepsky-objects-1_1622ccd9-042b-4aec-b31c-a974b2ff5095.jpg?v=1789592400"},{"product_id":"optolong-cls-ccd-filter","title":"Optolong CLS-CCD Light Pollution Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBlocks \u0026gt;99% of primary light pollution emission lines\u003c\/li\u003e\n\u003cli\u003eAchieves \u0026gt;90% average transmission on key nebula wavelengths\u003c\/li\u003e\n\u003cli\u003eIntegrated 300-1100nm UV\/IR cut filter for color cameras\u003c\/li\u003e\n\u003cli\u003eλ\/4 transmitted wavefront and 30s parallelism for sharp stars\u003c\/li\u003e\n\u003cli\u003e1.85mm thick optical glass substrate\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\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\u003eOptolong CLS-CCD Light Pollution Filter\u003c\/h2\u003e\n\u003cp\u003eThe Optolong CLS-CCD Light Pollution Filter is engineered to reclaim contrast in your astrophotos by blocking over 99% of common light pollution sources while maintaining an average transmission greater than 90% on critical nebula emission lines. Its integrated 300-1100nm blocking range makes it a single-filter solution for color CCD and modified DSLR cameras, eliminating star bloat from infrared without needing a separate IR-cut filter. The 1.85mm optical glass substrate is polished to a λ\/4 transmitted wavefront, ensuring your system's resolution is not compromised.\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\u003eBlocking \u0026gt;99% of Sodium and Mercury Vapor Lines\u003c\/h3\u003e\n\u003cp\u003eThis filter's primary function is to surgically remove the wavelengths associated with urban skyglow. It achieves a blocking depth of over 99% for mercury vapor, high-pressure sodium, and low-pressure sodium vapor lamps—the most common sources of artificial light pollution. By rejecting this unwanted light, the background sky in your images becomes significantly darker, allowing the faint, complex structures of nebulae to stand out.\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\u003eOver 90% Transmission on H-alpha, OIII, and SII\u003c\/h3\u003e\n\u003cp\u003eWhile aggressively blocking pollutants, the CLS-CCD maintains an average transmission rate (Tave) of over 90% across the most important emission lines for deep-sky objects. This high throughput applies to hydrogen-alpha (656nm), oxygen-III (496nm and 500nm), hydrogen-beta (486nm), and sulfur-II (672nm). The result is vibrant, high-contrast images of emission nebulae, planetary nebulae, and supernova remnants, with their natural colors preserved.\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\u003eThe CCD Advantage: Integrated 300-1100nm IR\/UV Cut for Color Sensors\u003c\/h3\u003e\n\u003cp\u003eThe \"CCD\" in the name signifies a critical feature: a built-in UV and IR cut filter covering a wide 300-1100nm range. Many color astronomy cameras and modified DSLRs have sensors that are sensitive to infrared light, which can cause bloated, unfocused stars if not filtered out. The CLS-CCD eliminates the need for a separate L-filter (luminance\/IR-cut), simplifying your imaging train and ensuring sharp, tight stars across 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\u003eCLS-CCD vs. Standard CLS: Why IR Cut Matters\u003c\/h3\u003e\n\u003cp\u003eThe key difference between the Optolong CLS-CCD and the standard visual CLS filter is the infrared blocking. While both filters suppress the same light pollution lines, the standard CLS allows infrared light to pass through. This makes it suitable for visual use or for monochrome cameras shooting with a separate filter wheel.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoose the CLS-CCD if:\u003c\/strong\u003e You use a one-shot-color (OSC) camera, a color CCD, or a modified DSLR. The integrated IR-cut is essential for preventing star bloat and achieving correct color balance without an extra filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoose the standard CLS if:\u003c\/strong\u003e You are a visual observer or use a monochrome camera with a separate IR-cut filter in your luminance (L) channel.\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 is the main difference between the Optolong CLS-CCD and the standard CLS filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOptolong CLS-CCD\u003c\/strong\u003e includes an integrated IR\/UV cut filter that blocks wavelengths from 300-1100nm. This is essential for color cameras (OSC\/DSLR) to prevent star bloat from infrared light. The standard CLS filter does not block IR and is intended more for visual use or monochrome imaging setups that use a separate luminance filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong CLS-CCD filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can, it's not ideal. The filter's transmission characteristics are optimized for the response of a digital sensor. For visual use, the standard Optolong CLS filter typically provides a brighter, more natural-looking view through the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Optolong CLS-CCD filter work with my unmodified DSLR camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but with limited effectiveness for certain objects. An unmodified DSLR has its own internal filter that blocks most of the deep red H-alpha light (656nm). The CLS-CCD will still improve contrast by blocking skyglow, but to capture the rich red nebulosity in objects like the North America Nebula (NGC 7000), a \"modified\" DSLR with the stock filter removed is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the CLS-CCD filter affect imaging the Orion Nebula (M42) from a city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor an object like the Orion Nebula (M42), the CLS-CCD filter will dramatically improve your results from a light-polluted area. It will darken the sky background, significantly increasing the contrast of the glowing hydrogen and oxygen gases that make up the nebula. This allows you to capture much more of the faint, extended nebulosity without the image being washed out by city lights.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Optolong CLS-CCD a good choice for imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt's a trade-off. Galaxies like the Andromeda Galaxy (M31) are broadband objects, meaning they emit light across the entire visible spectrum, similar to stars. A light pollution filter like the CLS-CCD will block some of the galaxy's own light along with the skyglow. While it can help darken the background, it may also alter the galaxy's natural color balance. For galaxies, less aggressive filters or simply capturing more data from a dark site is often the preferred approach.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Optolong CLS-CCD filter to look at the Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eAbsolutely not.\u003c\/strong\u003e The Optolong CLS-CCD filter is \u003cstrong\u003eNOT\u003c\/strong\u003e a solar filter and is not designed for sun observation. Looking at the Sun with this filter, or any filter not explicitly designed for safe solar viewing, will cause immediate and permanent eye damage, including blindness. Always use a certified safe solar filter that covers the entire front aperture of your telescope.\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eBroadband Light Pollution (LP) Filter with IR\/UV Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" Mounted, 2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Material\u003c\/td\u003e\n\u003ctd\u003eOptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAverage Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e300-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Pollution Blocking\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":52941923090717,"sku":"OPT-11901","price":133.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":52941923123485,"sku":"OPT-11902","price":223.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-The-CLS-CCD-broadband-filter-is-designed-to-improve-the-visibility-of-various-deepsky-objects-1_19932723-0c05-473f-91d2-3b4f840aeed2.jpg?v=1789592410"},{"product_id":"optolong-l-pro-uhc-clip-filter-kit","title":"Optolong L-Pro + UHC Clip Filter Kit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTwo Optolong Clip-in Light Pollution Filters in One Kit\u003c\/li\u003e\n\u003cli\u003eL-Pro: Multi-Bandpass Suppression Across 380-750nm\u003c\/li\u003e\n\u003cli\u003eUHC: \u0026gt;99% Blocking of Mercury and Sodium Vapor Light (OD3)\u003c\/li\u003e\n\u003cli\u003eNatural Color on Galaxies, High Contrast on Emission Nebulae\u003c\/li\u003e\n\u003cli\u003eFits Inside the Camera Body, Works With Any Lens\u003c\/li\u003e\n\u003cli\u003eCanon EOS APS-C, Canon EOS Full Frame and Nikon Full Frame 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\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\u003eOptolong L-Pro + UHC Clip Filter Kit\u003c\/h2\u003e\n\u003cp\u003eThe Optolong L-Pro + UHC Clip Filter Kit pairs Optolong's two broadband light pollution filters in clip-in format for your DSLR. The L-Pro is the multi-bandpass filter for natural color across a 380-750nm spectrum; the UHC is the narrower, higher-contrast filter that blocks more than 99% of mercury and sodium vapor light. Both clip inside the camera body, so either one works with any lens you mount, and you choose the filter for the target and the sky rather than compromising on one.\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\u003eL-Pro: Multi-Bandpass Suppression for Natural-Color Imaging\u003c\/h3\u003e\n\u003cp\u003eThe L-Pro selectively rejects the dominant emission lines of mercury vapor, high-pressure sodium and low-pressure sodium streetlights, plus the natural skyglow from neutral oxygen in the atmosphere, across its 380-750nm operating range. Its balanced, multi-bandpass design keeps the natural colors of broadband targets such as galaxies, reflection nebulae and globular clusters, so images need far less color correction. It still passes the key nebula lines, including H-Alpha, OIII, SII and H-Beta, and it blocks infrared on its own.\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\u003eUHC: Ultra High Contrast for Emission Nebulae Under City Skies\u003c\/h3\u003e\n\u003cp\u003eThe UHC takes the more aggressive approach. At an optical density of OD3 it blocks more than 99% of light from mercury vapor and sodium vapor lamps, while transmitting the emission lines of nebulae at OIII (496nm, 500nm), H-Beta (486nm) and H-Alpha (656nm). Its narrower passband gives higher contrast than a CLS filter, which makes it the better choice where light pollution is severe. Its substantial red passband captures H-Alpha well on unmodified DSLRs, for targets like the Orion Nebula (M42).\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 Between the L-Pro and the UHC on a Given Night\u003c\/h3\u003e\n\u003cp\u003eThe two filters cover different targets, which is why they are worth having together:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse the L-Pro\u003c\/strong\u003e for galaxies, reflection nebulae, star clusters and Milky Way landscapes, or whenever natural star color matters. It is the more versatile filter from suburban skies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse the UHC\u003c\/strong\u003e for emission nebulae from heavily light-polluted urban skies, where maximum contrast is the goal. It dims broadband targets such as galaxies, so switch back to the L-Pro for those.\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\u003eClip-in Format: Filtration Inside the Camera, Any Lens in Front\u003c\/h3\u003e\n\u003cp\u003eEach clip filter sits inside the camera body, so the light pollution filter works with whatever lens or telescope adapter you attach. The kit comes in three versions, each fitting one camera family:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCanon EOS APS-C:\u003c\/strong\u003e including the EOS 7D, 10D, 20D, 30D, 40D, 50D, 60D\/60Da, 70D, 550D, 600D, 650D, 700D, 1100D and 1200D.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCanon EOS Full Frame:\u003c\/strong\u003e Canon EOS full-frame DSLR bodies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNikon Full Frame:\u003c\/strong\u003e D600, D610, D700, D750, D800, D800E, D810, D810A and Df.\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\u003eOptical Quality and Durable Coatings\u003c\/h3\u003e\n\u003cp\u003eBoth filters are polished to a 60\/40 surface quality per MIL-O-13830, and the UHC to a transmitted wavefront of ¼ λ with 30s parallelism, so neither softens your images. Ion-assisted deposition coatings resist scratching and keep the central wavelength stable as the temperature changes through the night. Light pollution filters increase the contrast between the target and the sky; they do not make the object itself brighter.\u003c\/p\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 is the difference between the L-Pro and the UHC in this kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eL-Pro\u003c\/strong\u003e is a multi-bandpass filter that blocks the main streetlight wavelengths while preserving natural color, which suits galaxies, reflection nebulae and star clusters. The \u003cstrong\u003eUHC\u003c\/strong\u003e has a narrower passband and blocks more than 99% of mercury and sodium vapor light, giving higher contrast on emission nebulae from heavily light-polluted skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich version of the Optolong clip filter kit fits my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose the version for your camera family: \u003cstrong\u003eCanon EOS APS-C\u003c\/strong\u003e (for example the EOS 7D, 60D\/60Da, 70D, 600D, 700D), \u003cstrong\u003eCanon EOS Full Frame\u003c\/strong\u003e, or \u003cstrong\u003eNikon Full Frame\u003c\/strong\u003e (D600, D610, D700, D750, D800, D800E, D810, D810A, Df). Both filters in a kit are the same clip format.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use these clip filters with an unmodified DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The UHC is suited to color cameras and \u003cstrong\u003eunmodified DSLRs\u003c\/strong\u003e, and its substantial red passband captures H-Alpha well. The L-Pro works for both visual observation and astrophotography and preserves natural color with any color camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich filter should I use to photograph the Andromeda Galaxy (M31) from the suburbs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUse the \u003cstrong\u003eL-Pro\u003c\/strong\u003e. It darkens the suburban sky while preserving the galaxy's natural colors. The UHC blocks much of the broadband light a galaxy emits, so it would dim M31 rather than improve it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich filter should I use for the Orion Nebula (M42) from a city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUse the \u003cstrong\u003eUHC\u003c\/strong\u003e. It blocks the city skyglow while passing the nebula's H-Alpha, H-Beta and OIII light, bringing out faint outer structure. The L-Pro also works on M42 and keeps more natural star colors in the surrounding field, with less contrast from severely light-polluted skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use these filters to look at the Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNo. Never use these filters for solar observation.\u003c\/strong\u003e They are not designed for the Sun and do not block its intense radiation. Looking at the Sun through them will cause permanent blindness.\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\u003eKit Contents\u003c\/td\u003e\n\u003ctd\u003eOptolong L-Pro clip filter, Optolong UHC clip filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eL-Pro Spectrum\u003c\/td\u003e\n\u003ctd\u003e380-750nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eL-Pro Filter Type\u003c\/td\u003e\n\u003ctd\u003eMulti-bandpass light pollution filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUHC Blocking Range\u003c\/td\u003e\n\u003ctd\u003e300-700nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUHC Blocking Depth\u003c\/td\u003e\n\u003ctd\u003eOD3, light pollution line blocking \u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUHC Transmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003e¼ λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUHC Parallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40 (MIL-O-13830)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating Technology\u003c\/td\u003e\n\u003ctd\u003eIon-assisted deposition multi-layer coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Versions\u003c\/td\u003e\n\u003ctd\u003eClip for Canon EOS APS-C, Clip for Canon EOS Full Frame, Clip for Nikon Full Frame\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\"\u003eOptolong L-Pro Clip Filter (in selected version)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eOptolong UHC Clip Filter (in selected version)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/optolong-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOptolong 3-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"Clip for Canon EOS APS-C","offer_id":52941931872541,"sku":"OPT-LPRO-UHC-EOS-APSC","price":419.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Canon EOS Full Frame","offer_id":52941931905309,"sku":"OPT-LPRO-UHC-EOS-FF","price":419.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Nikon Full Frame","offer_id":52941931938077,"sku":"OPT-LPRO-UHC-NIKON-FF","price":419.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-UHC-L-Pro-Kit.webp?v=1789606223"}],"url":"https:\/\/davidastro.com\/fr\/collections\/light-pollution-filters.oembed","provider":"David Astro","version":"1.0","type":"link"}