{"title":"Dual \/ Multi-Band Filters (Color)","description":null,"products":[{"product_id":"william-optics-stc-astro-duo-narrowband-filter","title":"William Optics Filtre Bande Étroite STC Astro Duo","description":"\u003cul\u003e\n\n\u003cli\u003e\n\nFiltre passe-bande double pour l'astrophotographie\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Optimisé pour les raies d'émission H-alpha et OIII \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 Astro Duo-Narrowband Filter est un filtre d'astrophotographie spécialisé conçu pour améliorer la visibilité des nébuleuses à émission spécifique. Ce filtre passe-bande double isole les raies d'émission H-alpha et OIII, permettant aux astrophotographes de capturer de superbes images de nébuleuses avec un contraste et des détails élevés. \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 pour une utilisation en astrophotographie. Peut ne pas convenir à l'observation visuelle. Vérifiez 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 optique de précision qui permet la transmission de deux longueurs d'onde spécifiques : la raie H-alpha à 656 nm et la raie OIII à 500 nm. Cette configuration à double bande passante permet la capture des nébuleuses rouges et bleu-vert 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=\"Vue de face du filtre à bande étroite STC Astro Duo de William Optics\" src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/William-Optics-STC-Astro-Duo-Narrowband-Filter-YF-STC-ADN-1__15183.1596133266.1280.1280_832x832.jpg?v=1684339179\" 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=\"William Optics STC Astro Duo-Filtre à bande étroite en étui\" src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/William-Optics-STC-Astro-Duo-Narrowband-Filter-YF-STC-ADN-3__59568.1596133266.1280.1280_832x832.jpg?v=1684339179\" 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 Offre 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 une pollution lumineuse et une lueur du ciel réduites, permettant des captures plus claires et plus détaillées des nébuleuses en émission.\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 de nébuleuses en émission, notamment la nébuleuse d'Orion, la nébuleuse de la lagune, la nébuleuse du Voile et bien d'autres. La conception à double bande passante permet de capturer les émissions d’hydrogène et d’oxygène dans une seule image, offrant ainsi une représentation plus complète des structures nébulaires.\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 Construit avec du verre optique de haute qualité et des revêtements de précision pour garantir une durabilité et des performances optimales. Le filtre est probablement logé dans un cadre métallique robuste pour protéger les surfaces optiques délicates et faciliter sa manipulation.\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 Disponible en différentes tailles courantes pour s'adapter à différentes configurations de télescopes et de caméras. Vérifiez les options de taille spécifiques pour garantir la compatibilité avec votre équipement. Généralement proposé en tailles filetées de 1,25\", 2\" et 48 mm pour une polyvalence maximale.\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 isolant des raies d'émission spécifiques, ce filtre permet des temps d'exposition plus courts par rapport à l'imagerie à large bande, 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 Flexibilité du post-traitement\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n La nature double passe-bande de ce filtre offre une flexibilité en matière de post-traitement. Les astrophotographes peuvent ajuster l'équilibre entre les données H-alpha et OIII pour créer une gamme de représentations de couleurs, allant d'un aspect naturel à des interprétations plus artistiques des nébuleuses.\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":44967225590045,"sku":"WO-YF-STC-ADN","price":660.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-STC-Astro-Duo-Narrowband-Filter-YF-STC-ADN-1__15183.1596133266.1280.1280.jpg?v=1684339179"},{"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":"zwo-duo-band-filter","title":"ZWO Filtre bi-bande","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eLaisse passer les longueurs d'onde H-alpha (15nm) et OIII (35nm)\u003c\/li\u003e\n\u003cli\u003eConçu pour les caméras couleur (OSC)\u003c\/li\u003e\n\u003cli\u003eMonture filetée 1.25\"\u003c\/li\u003e\n\u003cli\u003eTransmission supérieure à 80% en Ha \u0026amp; 90% en OIII\u003c\/li\u003e\n\u003cli\u003eSubstrat poli à 1\/4 d'onde\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\u003eCaractéristiques\u003c\/li\u003e\n\u003cli\u003eDans la boîte\u003c\/li\u003e\n\u003cli\u003eTéléchargements\u003c\/li\u003e\n\u003cli\u003eGarantie\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\u003eZWO Filtre Duo-Band 1.25\"\u003c\/h2\u003e\n\u003cp\u003eLe filtre Duo-Band ZWO 1.25\" rend l'imagerie à bande étroite possible avec les caméras couleur en isolant les deux longueurs d'onde les plus importantes des nébuleuses en émission. Il capte le H-alpha (656.3 nm) dans une bande passante de 15 nm et l'OIII (500 nm) dans une bande passante de 35 nm, avec des taux de transmission supérieurs à 80% et 90% respectivement. Cette approche bi-bande augmente fortement le contraste sur les cibles en émission et vous permet de capter des données propres et détaillées depuis des sites pollués par la lumière avec votre caméra couleur actuelle.\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\u003eCaptez des données à bande étroite avec votre caméra couleur, avec plus de 90% de transmission\u003c\/h3\u003e\n\u003cp\u003eCe filtre est la voie la plus directe vers l'imagerie à bande étroite pour tout astronome équipé d'une caméra couleur CMOS ou CCD. En laissant passer simultanément le rouge profond de l'hydrogène alpha et le bleu-vert de l'oxygène III, il recueille en une seule pose les principales longueurs d'onde de structure et de détail des nébuleuses en émission. Plus besoin d'une caméra monochrome, d'une roue à filtres et d'un jeu de filtres SHO séparé : votre train optique est nettement simplifié et le temps d'acquisition total réduit.\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\u003eBandes passantes de 15nm en Ha \u0026amp; 35nm en OIII optimisées pour le signal\u003c\/h3\u003e\n\u003cp\u003eLe filtre Duo-Band ZWO offre une bande passante de 15 nm pour le H-alpha et une bande passante plus large de 35 nm pour l'OIII. Ce choix est un compromis délibéré entre le rejet des interférences et les besoins en signal de la matrice de Bayer d'un capteur couleur. Ces bandes passantes plus larges que la normale laissent davantage de photons atteindre le capteur, ce qui est essentiel pour obtenir un bon rapport signal\/bruit avec une caméra couleur en des temps de pose raisonnables, tout en bloquant la grande majorité de la pollution lumineuse des villes et de la lumière de la Lune.\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\u003eFiltre Duo-Band ZWO ou configuration monochrome complète\u003c\/h3\u003e\n\u003cp\u003eUne caméra monochrome dédiée avec une roue à filtres et des filtres à bande étroite de 3nm ou 5nm offrira toujours la meilleure résolution et la meilleure séparation des données possibles. Cette configuration permet un contrôle précis de chaque canal pour un traitement complexe en palette Hubble (SHO). Cependant, le filtre Duo-Band ZWO associé à une caméra couleur donne accès à l'imagerie de nébuleuses à haut contraste pour une fraction du coût, de la complexité et du temps d'installation. Pour les astrophotographes sous un ciel pollué qui veulent capter de superbes nébuleuses sans investir dans un second système d'imagerie complet, le filtre Duo-Band est la solution la plus pragmatique.\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\u003eOptique à 1\/4 d'onde \u0026amp; construction antireflet\u003c\/h3\u003e\n\u003cp\u003eChaque filtre Duo-Band est fabriqué sur un substrat Schott, poli avec une précision de 1\/4 d'onde pour ne pas compromettre la résolution de votre télescope. La qualité de surface 60\/40 respecte la norme MIL-O-13830, et la monture du filtre est usinée CNC dans un aluminium de qualité aéronautique. Une finition anodisée et des traitements internes anti-reflets empêchent les reflets et l'éblouissement interne de dégrader votre image finale, pour préserver le contraste élevé que ce filtre est conçu pour offrir.\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\"\u003eQuelles sont les performances du filtre Duo-Band ZWO sur la nébuleuse d'Orion (M42) avec une caméra couleur ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLe filtre Duo-Band ZWO est excellent pour la nébuleuse d'Orion (M42). Il isole le riche signal hydrogène alpha des ailes extérieures et la forte émission de l'oxygène III dans le cœur du Trapèze. Depuis un site pollué, ce filtre assombrit fortement le fond de ciel et fait ressortir la structure et les couleurs de la nébuleuse bien plus qu'un filtre antipollution lumineuse standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003ePuis-je photographier des galaxies comme Andromède (M31) avec le filtre Duo-Band ZWO ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNon, ce filtre n'est pas recommandé pour les cibles large bande comme les galaxies ou les amas d'étoiles. Les galaxies émettent de la lumière sur tout le spectre visible. Le filtre Duo-Band bloque presque toute cette lumière et ne laisse passer que les longueurs d'onde H-alpha et OIII. Vous capteriez les petites nébuleuses en émission dans les bras de M31, mais le cœur et les bandes de poussière de la galaxie seraient presque entièrement filtrés. Utilisez un filtre antipollution lumineuse large bande pour les galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003ePourquoi les bandes passantes H-alpha (15nm) et OIII (35nm) du filtre Duo-Band ZWO ont-elles des largeurs différentes ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCes largeurs de bande passante différentes sont un choix de conception délibéré pour les caméras couleur. La \u003cstrong\u003ebande passante OIII de 35 nm\u003c\/strong\u003e, plus large, laisse passer davantage de signal à travers la matrice de Bayer du capteur, moins sensible à ces longueurs d'onde. La \u003cstrong\u003ebande passante Ha de 15 nm\u003c\/strong\u003e, plus étroite, offre un meilleur contraste sur le signal hydrogène plus fort, en équilibrant l'intensité du signal et le rejet des sources de pollution lumineuse proches.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eLe filtre Duo-Band ZWO remplace-t-il bien une configuration avec caméra monochrome ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eC'est une excellente alternative, mais pas un remplacement direct. Une caméra monochrome avec des filtres séparés à bande très étroite (par exemple 3nm) offre une meilleure isolation des données pour des techniques de traitement avancées comme la palette Hubble. Le filtre Duo-Band ZWO offre aux utilisateurs de caméras couleur un moyen beaucoup plus simple et plus abordable d'obtenir les résultats à haut contraste de l'imagerie à bande étroite sur les nébuleuses en émission, sans le coût ni la complexité d'un système monochrome complet.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eLe filtre Duo-Band ZWO 1.25\" fonctionnera-t-il dans ma roue à filtres ZWO EFW ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOui, le filtre Duo-Band ZWO 1.25\" est fileté pour se monter directement dans toute roue à filtres électronique (EFW) ZWO acceptant les filtres 1.25\". Il peut aussi se visser directement sur tout coulant 1.25\" ou accessoire doté d'un filetage de filtre standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eQue signifie la spécification de qualité de surface 60\/40 du filtre Duo-Band ZWO ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCette spécification désigne le polissage optique et les imperfections de surface selon la norme militaire MIL-O-13830. Le « 60 » est la désignation des rayures, correspondant nominalement à une largeur de rayure d'environ 6 microns, et le « 40 » désigne le diamètre maximal admissible des piqûres en centièmes de millimètre. Une cote 60\/40 indique une surface optique de grande qualité adaptée aux applications d'imagerie exigeantes, avec une diffusion de la lumière minimale et un contraste d'image préservé.\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\u003eRéférence (SKU)\u003c\/td\u003e\n\u003ctd\u003eZWO-DB1.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType de filtre\u003c\/td\u003e\n\u003ctd\u003eDouble bande étroite (Ha, OIII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTaille\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.75mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMonture\u003c\/td\u003e\n\u003ctd\u003eMonture filetée\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBande passante H-alpha\u003c\/td\u003e\n\u003ctd\u003e15 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBande passante OIII\u003c\/td\u003e\n\u003ctd\u003e35 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission H-alpha\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;80% à 656.3 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission OIII\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;90% à 495.9 nm et 500.7 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrécision du front d'onde\u003c\/td\u003e\n\u003ctd\u003e1\/4 d'onde\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrat\u003c\/td\u003e\n\u003ctd\u003eVerre Schott\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eÉpaisseur\u003c\/td\u003e\n\u003ctd\u003e1.85 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQualité de surface\u003c\/td\u003e\n\u003ctd\u003e60\/40 (selon MIL-O-13830)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForme\u003c\/td\u003e\n\u003ctd\u003eRond\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\"\u003eFiltre Duo-Band ZWO 1.25\"\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\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTélécharger le logiciel\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\/fr\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eGarantie limitée ZWO de 2 ans\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Monté rond de 1,25 po","offer_id":44967448379677,"sku":"ZWO-DB1.25","price":139.0,"currency_code":"CAD","in_stock":true},{"title":"Monté rond de 2\"","offer_id":44967448412445,"sku":"ZWO-DB2","price":239.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-Duo-Band-Filter-1__12335.1596910054.1280.1280.jpg?v=1684342173"},{"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-l-extreme-filter","title":"Filtre Optolong L-Extrême","description":"\u003c!-- more --\u003e\u003cp\u003e\u003cspan\u003eL-eXtreme est un filtre passe-bande de deux 7 nm qui peut être utilisé avec des caméras couleur à un coup comme les reflex numériques (SLR) et les caméras CCD monochromes, il est également plus adapté aux systèmes rapides. La commodité et la rentabilité de ce filtre permettent aux amateurs d'imager des nébuleuses à émission riche, même dans un ciel lumineux et pollué par la lumière. Optolong pense que la conception du filtre L-eXtreme serait un meilleur choix pour les systèmes rapides à un prix compétitif. Il isole les raies d'émission des nébuleuses H-Alpha et Oxygène III afin que le contraste et le rapport signal sur bruit entre les nébuleuses soient maximisés. Pour les personnes qui vivent dans des zones très légèrement polluées, ou lorsque la lune est sortie, le L-eXtreme sera un bon filtre.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cbr\u003e\u003cspan\u003eContrairement au filtre Optolong L-eNhance qui est un tri-bande (transmet Hb, Ha et OIII), le filtre L-eXtreme est à double bande qui laisse passer les lignes d'émission Ha et OIII. L'avantage du filtre L-eXtreme est qu'il n'y a pas de transmission entre les raies H-bêta et OIII, car il n'y a pas de raies d'émission de nébuleuse là-bas. Dans ce cas, il ne laisse pas passer la pollution lumineuse, ce qui maximise le signal des nébuleuses et rend le fond du ciel plus sombre lors de l'imagerie. Le filtre L-eXtreme devrait mieux isoler les raies d'émission uniquement et mieux protéger de la pollution lumineuse.\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 \u003cbr\u003ePar conséquent, nous mettons en évidence Ha, Hb, O3 et O2, et réduisons le signal de soufre.\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003e\u003cstrong\u003e2. Spectre et caractéristique\u003c\/strong\u003e\u003cbr\u003e Sbustrate: B270\u003cbr\u003e Épaisseur : 1,85 mm\u003cbr\u003e Tpeak : T\u0026gt;90 %\u003cbr\u003e Plage de blocage : 300-1000nm\u003cbr\u003e Profondeur de blocage : blocage de la ligne de pollution lumineuse \u0026gt; 99 %\u003cbr\u003e Qualité de surface : 60\/40\u003cbr\u003e Front d'onde transmis RMS : λ\/4\u003cbr\u003e Parallélisme : 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_af4878c1a6fc4e40d035e2ddf44218cf.png?v=1684346852\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003e\u003cspan\u003eComment lire le tableau ?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e ▲ L'axe horizontal est la longueur d'onde en nanomètres (nm).\u003c\/p\u003e\n\u003cp\u003e ▲L'axe vertical est la transmission en %.\u003c\/p\u003e\n\u003cp\u003e ▲La ligne ROUGE montre la ligne de Halph. La ligne verte montre l'émission d'OIII. Les raies d'émission artificielles sont représentées en ORANGE. \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/www.optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003e\u003cstrong\u003e3. Technologie de revêtement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e ·Revêtement anti-reflet multicouches\u003c\/p\u003e\n\u003cp\u003e ·Revêtement de substrat optique non cimentant\u003c\/p\u003e\n\u003cp\u003e · Le filtre Optolong adopte un revêtement de précision basé sur la technologie de revêtement par dépôt assisté par ions pour la durabilité et la résistance aux rayures, ainsi que la stabilité sur CWL (longueur d'onde centrale) aucune déviation affectée par le changement de température.\u003c\/p\u003e \u003cp\u003e·Le système de rotation planétaire offre une précision et une homogénéité des revêtements assurant une valeur élevée sur la transmission de la bande passante et la densité optique de la bande passante.\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\" Monté","offer_id":44967910277405,"sku":"OPT-13901","price":335.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Monté","offer_id":44967910310173,"sku":"OPT-13902","price":432.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Nikon Z Full Frame","offer_id":52942348550429,"sku":"OPT-LEXTREME-NK-Z","price":363.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Optolong-L-Enhance__74495.1625788241.1280.1280.jpg?v=1684346873"},{"product_id":"optolong-l-ultimate-filter","title":"Optolong Filtre L-Ultimate Ha\/OIII 3nm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eRéduction extrême de la pollution lumineuse\u003c\/li\u003e\n\u003cli\u003eBandes passantes ultra étroites de 3 nm\u003c\/li\u003e\n\u003cli\u003eIsole les émissions clés H-alpha et OIII\u003c\/li\u003e\n\u003cli\u003eOffre un contraste supérieur et un fond de ciel plus sombre\u003c\/li\u003e\n\u003cli\u003eMinimise les halos d'étoiles sur les étoiles brillantes\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\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003ePrésentation du filtre Optolong L-Ultimate\u003c\/h2\u003e\n\u003cp\u003eL'Optolong L-Ultimate est un filtre passe-bande double haute performance spécialement conçu pour les astrophotographes utilisant des appareils photo couleur (DSLR, CMOS ou CCD) pour capturer les nébuleuses en émission. Grâce à ses bandes passantes ultra-étroites de 3 nm centrées sur les raies d'émission clés des nébuleuses – O III à 500,7 nm et H-alpha à 656,3 nm –, le filtre ne laisse passer que la lumière nébulaire et bloque l'éclairage public et les émissions atmosphériques indésirables. Cela assombrit considérablement le fond du ciel et améliore considérablement le contraste de l'image et le rapport signal\/bruit. Le L-Ultimate est l'un des outils les plus efficaces pour éliminer la pollution lumineuse extrême et capturer des images époustouflantes de nébuleuses en émission.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003eCapture double en une\u0026nbsp;exposition\u003c\/h3\u003e\n\u003cp\u003eContrairement aux configurations monochromes qui nécessitent plusieurs filtres et des expositions nocturnes longues, ce filtre capture les signaux H-alpha et OIII en une seule exposition lorsqu'il est associé à des caméras couleur. Cela vous fait gagner du temps et simplifie votre configuration, vous permettant d'obtenir des résultats comparables à ceux d'une caméra monochrome équipée de filtres à bande étroite séparés.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-img\"\u003e\u003cimg alt=\"Exemple de L-Ultimate NGC6888 par Andrea Maggi\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Ultimate-NGC6888-Example.jpg?v=1756078322\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003eÉtoiles plus nettes, effets de halo minimes\u003c\/h3\u003e\n\u003cp\u003eLe filtre L-Ultimate est conçu pour réduire considérablement les halos autour des étoiles brillantes, un problème fréquent avec les filtres à bande large, offrant des images d'étoiles plus nettes et plus nettes. En bloquant toute la lumière, à l'exception des raies d'émission critiques H-alpha et OIII, grâce à des bandes passantes ultra-étroites de 3 nm, le filtre maximise le signal des nébuleuses tout en minimisant le bruit du fond du ciel, ce qui produit une image finale plus nette nécessitant moins de post-traitement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-img\"\u003e\u003cimg alt=\"Graphique de transmission Optolong L-Ultimate\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Optolong-L-Ultimate-2-inch-Transmission-Graph__82916.1665168471.1280.1280.jpg?v=1684348283\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003eL-Ultimate contre L-eNhance et L-eXtreme\u003c\/h3\u003e\n\u003cp\u003eLe \u003cstrong\u003eL-Ultimate\u003c\/strong\u003e est un filtre à bande ultra-étroite double de 3 nm qui transmet uniquement les lignes d'émission H-alpha (656,3 nm) et O III (500,7 nm). Comparé au \u003cstrong\u003eL-eXtreme\u003c\/strong\u003e (double 7 nm) et \u003cstrong\u003eau L-eNhance\u003c\/strong\u003e (H-alpha 10 nm + O III\/H-beta 24 nm), le L-Ultimate offre plusieurs avantages :\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eFond de ciel plus sombre\u003c\/strong\u003e – sa bande passante plus étroite de 3 nm bloque presque toute la pollution lumineuse et les longueurs d’onde indésirables.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eContraste plus élevé et détails plus fins\u003c\/strong\u003e : les structures nébuleuses faibles ressortent plus clairement.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eContrôle supérieur des étoiles\u003c\/strong\u003e – réduit considérablement les halos et le gonflement des étoiles par rapport au L-eXtreme et surtout au L-eNhance.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePréservation optimisée des couleurs\u003c\/strong\u003e – maintient l’équilibre naturel des rouges H-alpha et des bleus\/verts O III.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEn bref:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eL-eNhance\u003c\/strong\u003e – filtre anti-pollution lumineuse d'entrée de gamme, bandes passantes plus larges, capture plus de lumière à large bande mais avec plus de lueur du ciel.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eL-eXtreme\u003c\/strong\u003e – contrôle plus strict (7 nm), réduction de la pollution lumineuse plus forte, mais permet toujours plus de lumière de fond que le L-Ultimate.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eL-Ultimate\u003c\/strong\u003e – l'option la plus avancée, avec la bande passante la plus étroite pour un contraste maximal, les étoiles les plus propres et les meilleures performances en cas de forte pollution lumineuse ou sous un clair de lune intense.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003eBlocage UV et IR\u003c\/h3\u003e\n\u003cp\u003eLa conception du filtre L-Ultimate supprime intrinsèquement les longueurs d'onde ultraviolettes (UV) et infrarouges (IR). Cette fonctionnalité simplifie le processus d'imagerie en éliminant le besoin d'un filtre anti-IR distinct. 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\/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\u003e1,85 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\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\u003eFWHM\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eH-alpha 3 nm, OIII 3 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 à H-alpha (656,3 nm) et OIII (500,7 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\u003eOD4 (300-1000 nm), bloquant toutes les principales lignes de pollution lumineuse artificielle\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-Ultimate\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Ultimate-2-inch-2__17268.1665168471.1280.1280_69b8bbf8-9db7-408c-84d8-4b9bc30fb052.jpg?v=1698452806\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFiltre L-Ultimate\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\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\" Monté","offer_id":50286466203933,"sku":"OPT-11601","price":404.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Monté","offer_id":44968046559517,"sku":"OPT-11602","price":545.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Optolong-L-Ultimate-2-inch-2__17268.1665168471.1280.1280.jpg?v=1684348283"},{"product_id":"askar-6nm-color-magic-ha-oiii-sii-oiii-d1-d2-filter-package","title":"Ensemble de filtres Askar 6 nm Colour Magic Ha\/OIII et SII\/OIII (D1+D2)","description":"\u003cul\u003e\n\n\u003cli\u003e\n\n Ensemble double filtre : 6 nm Ha\/OIII (D1) et 6 nm SII\/OIII (D2)\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Optimisé pour l'astrophotographie à contraste élevé et à bande étroite \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 L'ensemble de filtres Askar 6 nm Color Magic Ha\/OIII \u0026amp; SII\/OIII (D1+D2) est un ensemble complet de filtres à bande étroite conçus pour l'astrophotographie avancée. Ce package comprend deux filtres spécialisés : le 6 nm Ha\/OIII (D1) et le 6 nm SII\/OIII (D2), permettant aux astrophotographes de capturer de superbes images à contraste élevé de nébuleuses en émission et d'autres objets du ciel profond avec une séparation des couleurs vives. \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 \nCes filtres sont conçus pour être utilisés avec des caméras couleur. Assurez-vous de la compatibilité avec votre configuration d’imagerie avant l’achat.\n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv\u003e\n\n\u003ch3\u003e\n\n Spécifications 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 Les deux filtres de ce package disposent d'une bande passante étroite de 6 nm, isolant avec précision des raies d'émission spécifiques :\n 1. Ha\/OIII (D1) : combine les longueurs d’onde de l’hydrogène alpha et de l’oxygène III\n 2. SII\/OIII (D2) : combine les longueurs d'onde du soufre II et de l'oxygène III.\n Cette bande passante étroite supprime efficacement la pollution lumineuse tout en maximisant le signal des nébuleuses en émission. \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=\"Ensemble de filtres Askar Color Magic Ha\/OIII et SII\/OIII (D1+D2) 6 nm\" src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/Askar-Color-Magic-D1-D2__81140.1678398625.1280.1280_600x600.jpg?v=1684348734\" 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 Séparation améliorée des couleurs \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=\"Ensemble de filtres Askar Color Magic Ha\/OIII et SII\/OIII (D1+D2) 6 nm\" src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/Askar-Color-Magic-D1-D2__81140.1678398625.1280.1280_600x600.jpg?v=1684348734\" 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 La combinaison de ces deux filtres permet une excellente séparation des couleurs en astrophotographie. Le filtre Ha\/OIII capture les émissions rouges et bleu-vert, tandis que le filtre SII\/OIII capture les émissions rouge-orange et bleu-vert. Cette séparation permet la création d’images vives en fausses couleurs qui mettent en valeur la structure et la composition des nébuleuses.\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 Construction de haute qualité\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e \nFabriqué avec du verre optique de précision et des revêtements diélectriques de haute qualité pour garantir une excellente transmission de la lumière et un minimum de réflexions. Les filtres sont conçus pour maintenir leurs performances dans le temps, résistant à la dégradation due à l'exposition à l'humidité ou aux variations de température.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Application polyvalente\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Idéal pour imager une large gamme de nébuleuses en émission, de restes de supernova et de nébuleuses planétaires. Ces filtres sont particulièrement efficaces pour capturer les détails et les structures complexes d'objets comme la nébuleuse d'Orion, la nébuleuse du Voile et la nébuleuse d'Amérique du Nord.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Flux de travail efficace\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n En combinant plusieurs lignes d'émission dans chaque filtre, ce package permet une acquisition de données plus efficace par rapport à l'imagerie traditionnelle à bande étroite avec des filtres à ligne unique. Cela peut réduire considérablement la durée totale d’imagerie tout en fournissant d’excellentes données pour créer des images composites détaillées.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Contraste amélioré dans les cieux pollués par la lumière\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e \nLa bande passante étroite de 6 nm de ces filtres supprime efficacement la pollution lumineuse et la lueur du ciel, permettant ainsi d'obtenir des images à contraste élevé, même à partir d'emplacements urbains et suburbains. Cela en fait des outils précieux pour les astrophotographes confrontés à des conditions célestes loin d’être idéales.\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 Conçu pour être utilisé avec des caméras monochromes CCD ou CMOS. Vérifiez la taille du filtre et les spécifications du filetage pour garantir la compatibilité avec votre télescope ou votre système de caméra. Ces filtres sont généralement disponibles dans des tailles courantes telles que 1,25\" ou 2\" pour s'adapter aux roues à filtres et aux adaptateurs d'appareil photo standard.\n\u003c\/p\u003e\n\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968075297053,"sku":"ASK-CM-D1D2","price":875.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-Color-Magic-D1-D2__81140.1678398625.1280.1280.jpg?v=1684348734"},{"product_id":"antlia-alp-t-dualband-5nm-sii-hb-filter","title":"Antlia Filtre duoband ALP-T SII\/Hb de 5nm","description":"\u003c!-- more --\u003e\n \u003cp\u003eLe \u003cspan\u003efiltre\u003c\/span\u003e \u003cspan\u003eSII\u0026amp;Hb double bande 5 nm ALP-T\u003c\/span\u003e \u003cspan\u003eest un filtre passe-ligne double, qui laisse passer la ligne rouge foncé\u003c\/span\u003e \u003cstrong\u003e\u003cspan\u003eSulphur-II\u003c\/span\u003e\u003c\/strong\u003e \u003cspan\u003eet la ligne bleue\u003c\/span\u003e \u003cstrong\u003e\u003cspan\u003eHydrogène-Beta\u003c\/span\u003e\u003c\/strong\u003e \u003cspan\u003eet est utilisé avec les appareils photo couleur one-shot (OSC) tels que les reflex numériques. ou des caméras astronomiques OSC. Il s'agit d'un ajout important au populaire filtre Ha\u0026amp;OIII double bande 5 nm Antlia ALP-T et permet des images en fausses couleurs et des images de nébuleuses à bande étroite à l'aide de l'OSC. Lors de la capture de données avec ce filtre, les nébuleuses sont enregistrées avec un plus grand contraste sur l'arrière-plan que sans celui-ci.\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cspan\u003eLa\u003c\/span\u003e \u003cspan\u003ecombinaison de ces deux filtres double bande permet des images à bande extrêmement étroite avec les caméras OSC en capturant les données spectrales de 4 canaux, c'est-à-dire Ha\/OIII\/SII\/Hb. Le spectre de ces quatre canaux peut être séparé et recombiné en différentes palettes de couleurs lors de votre post-traitement. Les images résultantes peuvent être utilisées pour améliorer le contraste de luminance des images traditionnelles équilibrées RVB ou pour créer des images dans diverses palettes de fausses couleurs populaires telles que\u003c\/span\u003e \u003cspan\u003eHO-Hb,\u003c\/span\u003e \u003cspan\u003eS\u003c\/span\u003e \u003cspan\u003e-\u003c\/span\u003e \u003cspan\u003eH\u003c\/span\u003e \u003cspan\u003e-\u003c\/span\u003e \u003cspan\u003eO\u003c\/span\u003e \u003cspan\u003e,\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eHS-OHb, HOO, etc.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e Pourquoi concevoir \u003cstrong\u003e\u003cspan\u003eun laissez-passer pour\u003c\/span\u003e\u003c\/strong\u003e \u003cstrong\u003e\u003cspan\u003ela bande SII\u0026amp;Hb\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003eau lieu des\u003c\/span\u003e\u003c\/strong\u003e \u003cstrong\u003e\u003cspan\u003ebandes OIII\u0026amp;SII ?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cspan\u003eLe filtre est dédié à la capture des raies d'émission H-beta et SII. Nous savons que le SII est un\u003c\/span\u003e \u003cspan\u003esoufre uniquement ionisé qui émet de la lumière dans la partie rouge foncé du spectre, au-delà du H-alpha,\u003c\/span\u003e \u003cspan\u003emais la\u003c\/span\u003e \u003cspan\u003econtribution du H-bêta aux raies d'émission des nébuleuses\u003c\/span\u003e \u003cspan\u003eest souvent négligée, même s'il s'agit de\u003c\/span\u003e \u003cspan\u003ela deuxième plus grande contribution. Émission commune d’hydrogène après la raie H-alpha.\u003c\/span\u003e \u003cspan\u003eCapturer\u003c\/span\u003e \u003cspan\u003edavantage d'OIII augmentera le signal existant mais ne donnera pas plus d'informations. Cependant, l'Hb a\u003c\/span\u003e \u003cspan\u003ele\u003c\/span\u003e \u003cspan\u003epotentiel de révéler des structures non observées avec l'OIII.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eLe\u003c\/span\u003e \u003cspan\u003ebut\u003c\/span\u003e \u003cspan\u003eest de capturer la raie d'émission H-bêta dans certaines nébuleuses qui contiennent du spectre bleu, ce qui ne peut pas être capturé par\u003c\/span\u003e \u003cspan\u003eles filtres H-alpha, SII et OIII\u003c\/span\u003e \u003cspan\u003e.\u003c\/span\u003e \u003cspan\u003eDes détails plus grands et plus riches seront capturés dans de nombreuses images de nébuleuses pour obtenir des résultats avec un rapport signal\/bruit supérieur.\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cspan\u003eIl est généralement admis que le signal OIII contribue relativement moins aux images de nébuleuses. La sensibilité passe-bande OIII est une considération importante pour tout filtre de nébuleuse.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eLa plupart des caméras couleur (OSC) utilisent un motif RGGB Bayer. L'attribution de deux fois plus de pixels verts par rapport aux pixels rouges ou bleus permet une capture bien améliorée du signal OIII.\u003c\/span\u003e \u003cspan\u003eDe plus,\u003c\/span\u003e \u003cspan\u003eun signal OIII plus élevé peut être obtenu par une exposition supplémentaire à l'aide du filtre Antlia ALP-T Ha\u0026amp;O3, puis en isolant les canaux GB, suivi de la synthèse d'un canal OIII à ajouter dans votre pile.\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cspan\u003eDans le cas où vous souhaitez uniquement ajouter du SII à vos données Ha\u0026amp;OIII, il peut être préférable d'acheter un\u003c\/span\u003e filtre \u003cspan\u003eà bande étroite\u003c\/span\u003e SII \u003cspan\u003eet\u003c\/span\u003e \u003cspan\u003ed'obtenir une émission spectrale SII plus propre. Cependant, notre nouvelle conception de filtre (SII\u0026amp;Hb) inclut la raie d'émission H-bêta qui offre une nette amélioration du contraste des nébuleuses et une meilleure séparation des caractéristiques dans les zones d'Hb.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003e\u003cspan\u003eFiltre Antlia ALP-T Dual Band 5nm Ha\u0026amp;OIII\u003c\/span\u003e\u003c\/strong\u003e \u003cspan\u003e: Filtre double bande avec une bande passante très étroite de 5 nm en OIII et H-alpha pour obtenir un rapport signal\/bruit plus élevé. L’amélioration du contraste qui en résulte pour l’OSC est impressionnante.\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFiltre Antlia ALP-T Dual Band 5 nm SII\u0026amp;Hb :\u003c\/span\u003e\u003c\/strong\u003e \u003cspan\u003eFiltre double bande avec une bande passante très étroite de 5 nm H-beta et S-II. Ce filtre est idéal pour\u003c\/span\u003e \u003cspan\u003eaugmenter\u003c\/span\u003e \u003cspan\u003ele\u003c\/span\u003e \u003cspan\u003econtraste des nébuleuses qui\u003c\/span\u003e \u003cspan\u003eémettent\u003c\/span\u003e \u003cspan\u003edans le soufre\u003c\/span\u003e \u003cspan\u003eet\u003c\/span\u003e \u003cspan\u003ele H-bêta\u003c\/span\u003e \u003cspan\u003e.\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eplage utilisant OSC\u003c\/span\u003e \u003cspan\u003e.\u003c\/span\u003e \u003cspan\u003eIl offre une séparation et une isolation supplémentaires dans les zones Hb.\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cspan\u003eLes revêtements multiples avancés des filtres double bande Antlia ALP-T isolent efficacement les lignes rouge, Ha, bleu-vert, OIII, rouge foncé SII et les lignes bleues H-bêta des nébuleuses en émission, avec une suppression presque totale de la densité optique ( OD)4,5 sur les longueurs d'onde indésirables dues à la pollution lumineuse, au clair de lune et à la lueur de l'air. Le résultat est que\u003c\/span\u003e \u003cspan\u003eles\u003c\/span\u003e \u003cspan\u003efiltres ALP-T double bande 5 nm Ha\u0026amp;OIII et SII\u0026amp;Hb créent\u003c\/span\u003e \u003cspan\u003eun\u003c\/span\u003e \u003cspan\u003erapport signal\/bruit supérieur et un meilleur contraste dans vos images OSC.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003e\u003cspan\u003eLes principales fonctionnalités\u003c\/span\u003e\u003c\/strong\u003e \u003cstrong\u003e\u003cspan\u003eet\u003c\/span\u003e\u003c\/strong\u003e \u003cstrong\u003e\u003cspan\u003eapplications\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003ePasse la ligne SII 672,4 nm et la ligne H-Beta 486,1 nm\u003c\/span\u003e\u003cspan\u003e ;\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eConçu spécifiquement pour une utilisation avec les caméras couleur DSLR, CMOS et CCD\u003c\/span\u003e\u003cspan\u003e ;\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eUltra\u003c\/span\u003e \u003cspan\u003eFWHM\u003c\/span\u003e \u003cspan\u003e5 nm\u003c\/span\u003e \u003cspan\u003epermet\u003c\/span\u003e \u003cspan\u003ed'augmenter le temps d'exposition\u003c\/span\u003e \u003cspan\u003e;\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cspan\u003eIl est recommandé de l'utiliser avec le filtre ALP-T Dual Band 5nm Ha\u0026amp;OIII pour\u003c\/span\u003e \u003cspan\u003ecréer des images avec un meilleur\u003c\/span\u003e \u003cspan\u003erapport signal\u003c\/span\u003e \u003cspan\u003e\/bruit et une meilleure\u003c\/span\u003e \u003cspan\u003eisolation\u003c\/span\u003e \u003cspan\u003eentre les 4 canaux\u003c\/span\u003e\u003cspan\u003e ;\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eLa suppression de la densité optique (OD)4,5 sur les longueurs d'onde indésirables améliore le rapport signal\/bruit\u003c\/span\u003e \u003cspan\u003e;\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003ePasse-bande extrêmement raide et bords noircis\u003c\/span\u003e \u003cspan\u003edes tailles non montées\u003c\/span\u003e \u003cspan\u003epour minimiser les réflexions internes\u003c\/span\u003e \u003cspan\u003e;\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eFlat-top idéal et passe-bande modéré réduisant les décalages de spectre vers le bas\u003c\/span\u003e\u003cspan\u003e ;\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eTechnologie de revêtement par dépôt assisté par pistolet ionique sur le substrat poli double face, ce qui en fait le filtre de suppression de la pollution lumineuse le plus cohérent et le plus précis\u003c\/span\u003e\u003cspan\u003e ;\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eConçu pour supprimer l'éclairage artificiel de l'échelle de Bortle 1 à l'échelle de Bortle 8\u003c\/span\u003e\u003cspan\u003e ;\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eIl peut également être utilisé comme filtre à bande étroite pour les caméras monochromes afin de gagner du temps d'imagerie\u003c\/span\u003e \u003cspan\u003e;\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cspan\u003eLe proche IR (NIR) est bloqué jusqu'à 1 100 nm\u003c\/span\u003e \u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"2\" Monté","offer_id":45077820997917,"sku":"ANT-ALP-T-SII-HB-2","price":497.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Antlia-ALP-T-Dualband-5nm-Filter.jpg?v=1685810699"},{"product_id":"antlia-alp-t-dualband-5nm-ha-oiii-highspeed-filter","title":"Antlia Filtre duoband ALP-T haute vitesse Ha\/OIII de 5nm","description":"\u003c!-- more --\u003e\n\u003cp\u003e Les filtres haute vitesse ALP-T double bande 5 nm sont encore optimisés pour fonctionner avec des systèmes d'imagerie à haute vitesse en décalant légèrement la bande passante et la longueur d'onde centrale. L'utilisation de ces filtres haute vitesse entre les optiques f\/2,2 et f\/3,6 donne des images beaucoup plus fortes et contrastées dans l'imagerie des nébuleuses par rapport à la version standard.\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cp\u003e Pour les rapports f optiques plus lents que f\/3,6, le filtre standard ALP-T Dual Band 5 nm est fortement recommandé. En attendant, si vous recherchez les meilleures performances possibles avec des optiques plus rapides que f\/2,2, la version haute vitesse est le meilleur choix.\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\n \u003cp\u003eMais gardez à l'esprit que les données de décalage vers le bleu obtenues par la simulation informatique indiquent que le filtre à bande étroite déplace sa bande passante vers des longueurs d'onde plus courtes avec une optique plus rapide que f\/2, la transmission à la longueur d'onde d'émission peut diminuer de 15 à 20 % peut-être. Bien que le filtre haute vitesse Antlia ALP-T présente une réduction similaire des taux de transmission dans le Ha et l'OIII lorsque le filtre est utilisé sur une optique rapide, sur la base des données des utilisateurs de la version standard actuelle, il est évident que le filtre a toujours la haute performance d'augmentation de contraste de la nébuleuse d'émission et halo minimisé.\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cp\u003e Le prix de la version haut débit est le même que celui des filtres standard et offre le double d'avantages pour les utilisateurs d'optiques haut débit. Il convient de mentionner qu'Antlia a inspecté et mesuré les produits pièce par pièce avec l'un des spectrophotomètres professionnels d'Agilent Cary, la résolution\/largeur de fente peut atteindre 0,2 nm, ce qui nous permet de vous fournir des produits hautement fiables et cohérents.\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\n \u003cp\u003eLe filtre Antlia ALP-T double bande série 5 nm est un filtre passe-ligne double conçu pour être utilisé principalement avec les caméras couleur mono-coup (OSC) telles que les reflex numériques et les caméras OSC astronomiques. Il peut également être utilisé comme filtre à bande étroite pour les caméras monochromes afin de gagner du temps d'imagerie. Les revêtements multiples avancés de notre filtre ultra double bande ALP-T isolent efficacement la lumière des lignes rouge Ha et bleu-vert OIII des nébuleuses d'émission, avec une suppression presque totale de la densité optique (OD) 4,5 sur les longueurs d'onde indésirables de la pollution lumineuse, du clair de lune. , et la lueur de l'air. Le résultat est que notre filtre ALP-T double bande 5 nm crée un rapport signal\/bruit supérieur et un meilleur contraste dans vos images.\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cp\u003e Le filtre permet de capturer simultanément les deux principales bandes d’émission des nébuleuses, tout en supprimant la pollution lumineuse indésirable. Il vous permet de capturer des données plus propres et réduit les efforts de post-traitement pour isoler les détails faibles de la pollution lumineuse de fond.\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cstrong\u003e\u003cspan\u003eApplication et performances :\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e Conçu spécialement pour les optiques d'astronomie rapides, en particulier les rapports f\/2,2 à f\/3,6\u003c\/p\u003e\n\n\u003cp\u003e Conçu spécifiquement pour être utilisé avec les caméras couleur DSLR, CMOS et CCD\u003c\/p\u003e\n\n\u003cp\u003e La suppression de la densité optique (OD) 4,5 sur les longueurs d'onde indésirables ajoute un rapport signal\/bruit\u003c\/p\u003e\n\n\u003cp\u003e Les bords passe-bande extrêmement raides minimisent les réflexions internes\u003c\/p\u003e\n\n\u003cp\u003e Flat-top idéal et passe-bande modéré réduisant les décalages de spectre vers le bas\u003c\/p\u003e\n\n\u003cp\u003e Technologie de revêtement par dépôt assisté par pistolet ionique sur le substrat poli double face, ce qui en fait le filtre de suppression de la pollution lumineuse le plus cohérent et le plus précis\u003c\/p\u003e\n\n\u003cp\u003e Conçu pour supprimer l'éclairage artificiel de l'échelle de Bortle 1 à l'échelle de Bortle 8\u003c\/p\u003e\n\n\u003cp\u003e Le proche IR (NIR) est bloqué jusqu'à 1050 nm\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003e\u003cspan\u003eSpécifications techniques:\u003c\/span\u003e\u003c\/strong\u003e \u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003ctable border=\"1\" align=\"LEFT\" width=\"585px\" bordercolor=\"#000000\" _innercreatetable=\"true\" units=\"hasPercent\"\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"22.6%\" bordercolor=\"#000000\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"25.3%\" bordercolor=\"#000000\"\u003e \u003cspan\u003eHydrogène alpha\u003c\/span\u003e\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"24.7%\" bordercolor=\"#000000\"\u003e \u003cspan\u003eOxygène III\u003c\/span\u003e\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"22.6%\" bordercolor=\"#000000\"\u003e \u003cspan\u003eFWHM\u003c\/span\u003e\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"25.3%\" bordercolor=\"#000000\"\u003e \u003cspan\u003e5 nm\u003c\/span\u003e\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"24.7%\" bordercolor=\"#000000\"\u003e \u003cspan\u003e5 nm\u003c\/span\u003e\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"22.6%\" bordercolor=\"#000000\"\u003e \u003cspan\u003eCWL (longueur d'onde centrale)\u003c\/span\u003e\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"25.3%\" bordercolor=\"#000000\"\u003e \u003cspan\u003e657,8 nm\u003c\/span\u003e\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"24.7%\" bordercolor=\"#000000\"\u003e \u003cspan\u003e502,2 nm\u003c\/span\u003e\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"22.6%\" bordercolor=\"#000000\"\u003e \u003cspan\u003eTransmission de pointe\u003c\/span\u003e\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"25.3%\" bordercolor=\"#000000\"\u003e \u003cspan\u003e88%\u003c\/span\u003e\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"24.7%\" bordercolor=\"#000000\"\u003e \u003cspan\u003e82%\u003c\/span\u003e\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"22.6%\" bordercolor=\"#000000\"\u003e \u003cspan\u003eBlocage\u003c\/span\u003e\n\u003c\/td\u003e\n\n\u003ctd colspan=\"2\" rowspan=\"1\" valign=\"top\" bordercolor=\"#000000\"\u003e \n\u003cspan\u003e≥\u003c\/span\u003e \u003cspan\u003eOD4,5 à 300-1050 nm\u003c\/span\u003e \n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"22.6%\" bordercolor=\"#000000\"\u003e \u003cspan\u003eÉpaisseur du filtre\u003c\/span\u003e\n\u003c\/td\u003e\n\n\u003ctd colspan=\"2\" valign=\"top\" bordercolor=\"#000000\"\u003e \u003cspan\u003e2 mm +\/-0,05 mm\u003c\/span\u003e \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\u003cbr\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBague filtrante :\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e 2'' (M48*0.75)\u003c\/p\u003e\n\n\u003cp\u003e Cellule filtrante ultra fine pour minimiser le vignettage en maximisant l'ouverture claire possible\u003c\/p\u003e\n\n\u003cp\u003e Finition anodisée noire\u003c\/p\u003e\n\n\u003cp\u003e Gravure au laser sans décoloration\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"2\" Monté","offer_id":45077823815965,"sku":"ANT-ALP-T-HS-2","price":540.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Antlia-ALP-T-Dualband-5nm-Filter_fd3f123c-ea97-42a5-8c88-c5ee1d114943.jpg?v=1685810834"},{"product_id":"antlia-alp-t-dualband-5nm-ha-oiii-filter","title":"Antlia Filtre duoband ALP-T Ha\/OIII de 5nm","description":"\u003c!-- more --\u003e\n \u003cp\u003e\u003cspan\u003eL'\u003c\/span\u003e \u003cstrong\u003e\u003cspan\u003eAntlia ALP-T\u003c\/span\u003e\u003c\/strong\u003e \u003cstrong\u003e\u003cspan\u003edouble bande\u003c\/span\u003e\u003c\/strong\u003e \u003cstrong\u003e\u003cspan\u003e5 nm\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003eLe filtre\u003c\/span\u003e\u003c\/strong\u003e \u003cstrong\u003e\u003cspan\u003eHa\u0026amp;OIII\u003c\/span\u003e\u003c\/strong\u003e \u003cspan\u003eest un filtre passe-ligne double conçu pour être utilisé principalement avec les appareils photo couleur mono-coup (OSC) tels que les reflex numériques\u003c\/span\u003e \u003cspan\u003eet\u003c\/span\u003e \u003cspan\u003eles appareils photo OSC astronomiques. Il peut également être utilisé comme filtre à bande étroite pour les caméras monochromes afin de gagner du temps d'imagerie. Les revêtements multiples avancés du\u003c\/span\u003e filtre \u003cspan\u003eultra\u003c\/span\u003e \u003cspan\u003edouble bande\u003c\/span\u003e \u003cspan\u003eAntlia\u003c\/span\u003e ALP-T isolent efficacement la lumière des lignes rouge \u003cspan\u003eHa\u003c\/span\u003e \u003cspan\u003eet bleu-vert OIII des nébuleuses d'émission, avec une suppression presque totale de\u003c\/span\u003e \u003cspan\u003ela densité\u003c\/span\u003e \u003cspan\u003eoptique\u003c\/span\u003e \u003cspan\u003e(\u003c\/span\u003e \u003cspan\u003eDO\u003c\/span\u003e \u003cspan\u003e)\u003c\/span\u003e \u003cspan\u003e4,5\u003c\/span\u003e \u003cspan\u003esur les longueurs d'onde indésirables de la pollution lumineuse. , le clair de lune et la lueur de l'air. Le résultat est que notre double ALP-T\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eLe filtre bande 5 nm crée un rapport signal\/bruit supérieur et un meilleur contraste dans vos images.\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cspan\u003eLe filtre permet de capturer simultanément les deux principales bandes d’émission des nébuleuses, tout en supprimant la pollution lumineuse indésirable. Il vous permet de capturer des données plus propres et réduit les efforts de post-traitement pour isoler les détails faibles de la pollution lumineuse de fond.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003e\u003cspan\u003eApplication et performances :\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eConçu spécifiquement pour être utilisé avec les caméras couleur DSLR, CMOS et CCD\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eLa suppression de\u003c\/span\u003e \u003cspan\u003ela densité optique (OD)\u003c\/span\u003e \u003cspan\u003e4,5 sur les longueurs d'onde indésirables ajoute un rapport signal\/bruit\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e Les bords \u003cspan\u003epasse-bande\u003c\/span\u003e \u003cspan\u003eextrêmement raides\u003c\/span\u003e \u003cspan\u003eminimisent les réflexions internes\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eFlat-top idéal et passe-bande modéré réduisant les décalages de spectre vers le bas\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eTechnologie de revêtement par dépôt assisté par pistolet ionique sur le substrat poli double face\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003ece qui en fait le plus\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003efiltre de suppression de la pollution lumineuse cohérent et précis\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003cspan\u003eConçu pour supprimer l'éclairage artificiel de\u003c\/span\u003e \u003cspan\u003el'échelle de Bortle\u003c\/span\u003e \u003cspan\u003e1 à\u003c\/span\u003e \u003cspan\u003el'échelle de Bortle\u003c\/span\u003e \u003cspan\u003e8\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cspan\u003eLe proche IR (NIR) est bloqué jusqu'à 1100 nm\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003e\u003cspan\u003eSpécifications techniques:\u003c\/span\u003e\u003c\/strong\u003e \u003c\/p\u003e\n\n\u003ctable cellspacing=\"0\" border=\"1\"\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"232\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"217\"\u003e\n\n\u003cp\u003e \u003cspan\u003eHydrogène alpha\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"210\"\u003e\n\n\u003cp\u003e \u003cspan\u003eOxygène III\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"232\"\u003e\n\n\u003cp\u003e \u003cspan\u003eFWHM\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"217\"\u003e\n\n\u003cp\u003e \u003cspan\u003e5 nm\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"210\"\u003e\n\n\u003cp\u003e \u003cspan\u003e5 nm\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"232\"\u003e\n\n\u003cp\u003e \u003cspan\u003eCWL (longueur d'onde centrale)\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"217\"\u003e\n\n\u003cp\u003e \u003cspan\u003e656,3 nm\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"210\"\u003e\n\n\u003cp\u003e \u003cspan\u003e500,7 nm\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"232\"\u003e\n\n\u003cp\u003e \u003cspan\u003eTransmission de pointe\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"217\"\u003e\n\n\u003cp\u003e \u003cspan\u003e9\u003c\/span\u003e \u003cspan\u003e2\u003c\/span\u003e \u003cspan\u003e%\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd valign=\"top\" width=\"210\"\u003e\n\n\u003cp\u003e \u003cspan\u003e8\u003c\/span\u003e \u003cspan\u003e8\u003c\/span\u003e \u003cspan\u003e%\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"232\"\u003e\n\n\u003cp\u003e \u003cspan\u003eBlocage\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd colspan=\"2\" valign=\"top\" width=\"426\"\u003e\n\n\u003cp\u003e \u003cspan\u003e≥\u003c\/span\u003e \u003cspan\u003eOD4,5 à 300-1100 nm\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd valign=\"top\" width=\"232\"\u003e\n\n\u003cp\u003e \u003cspan\u003eÉpaisseur du filtre\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\u003ctd colspan=\"2\" valign=\"top\" width=\"426\"\u003e\n\n\u003cp\u003e \u003cspan\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","brand":"Antlia","offers":[{"title":"2\" Monté","offer_id":45077868478749,"sku":"ANT-ALP-T-2","price":540.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Antlia-ALP-T-Dualband-5nm-Filter_422c581a-decd-4477-8e9a-260245f0f792.jpg?v=1685811364"},{"product_id":"antlia-alp-t-filter-set","title":"Antlia Kit de filtres duoband ALP-T 5nm Ha\/OIII et SII\/Hb - 2\"","description":"","brand":"Antlia","offers":[{"title":"Default Title","offer_id":45077902983453,"sku":"ANT-ALP-T-SET","price":980.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Antlia-ALP-T-Dualband-5nm-Filter-Set.jpg?v=1685811953"},{"product_id":"askar-6nm-color-magic-super-sii-oiii-d2-filter-2","title":"Filtre Askar Color Magic Super SII\/OIII D2 6 nm - 2\"","description":"\u003cul\u003e\n\n\u003cli\u003e\n\n Filtre à double bande étroite de 6 nm pour les longueurs d'onde SII et OIII\n\n\u003c\/li\u003e\n\n\u003cli\u003e \nTaille de 2 pouces pour la compatibilité avec diverses configurations de télescope \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 Askar 6 nm Color Magic Super SII\/OIII D2 est un filtre d'astrophotographie spécialisé de 2 pouces conçu pour capturer des images époustouflantes de nébuleuses en émission. Ce filtre à double bande étroite isole à la fois les raies d'émission de soufre II (SII) et d'oxygène III (OIII), permettant aux astrophotographes de créer des images détaillées et contrastées d'objets du ciel profond avec des couleurs éclatantes. \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\n Ce filtre est conçu pour être utilisé avec des caméras couleur. Assurez-vous de la compatibilité avec votre configuration d’imagerie avant l’achat.\n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv\u003e\n\n\u003ch3\u003e\n\n Spécifications 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 Le filtre Askar Color Magic Super SII\/OIII D2 dispose d'une bande passante étroite de 6 nm, lui permettant d'isoler efficacement les raies d'émission SII et OIII tout en bloquant la pollution lumineuse indésirable. Cette précision permet de produire des images très contrastées avec un excellent rapport signal\/bruit, même dans des conditions de ciel loin d'être idéales. \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 Askar Color Magic Super SII\/OIII D2 6 nm - 2\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/Askar-Color-Magic-D2-Filter_1000x1000.jpg?v=1699985639\" 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 Performances à double bande étroite \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 Askar Color Magic Super SII\/OIII D2 6 nm - 2\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/Askar-Color-Magic-D2-Filter_1000x1000.jpg?v=1699985639\" 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 En combinant les longueurs d'onde SII et OIII dans un seul filtre, ce filtre D2 permet une acquisition de données plus efficace par rapport à l'utilisation de filtres individuels à bande étroite. Il capture simultanément les émissions rouge-orange (SII) et bleu-vert (OIII), permettant la création d'images saisissantes en fausses couleurs avec un temps d'exposition total réduit.\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 Construction de haute qualité\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Fabriqué avec du verre optique de précision et des revêtements diélectriques de haute qualité pour garantir une excellente transmission de la lumière et un minimum de réflexions. Le filtre est conçu pour maintenir ses performances dans le temps, en résistant à la dégradation due à l'exposition à l'humidité ou aux variations de température.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Application polyvalente\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Idéal pour imager une large gamme de nébuleuses en émission, de restes de supernova et de nébuleuses planétaires. La taille de 2 pouces garantit la compatibilité avec de nombreux télescopes et configurations de caméras, ce qui en fait un ajout polyvalent à la boîte à outils de tout astrophotographe.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Contraste amélioré\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e \nLa bande passante étroite de 6 nm supprime efficacement la pollution lumineuse et la lueur du ciel, permettant une imagerie à contraste élevé, même à partir d'emplacements pollués par la lumière. Cela rend le filtre particulièrement utile pour les astrophotographes urbains et suburbains.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Flux de travail efficace\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n En capturant simultanément les données SII et OIII, ce filtre rationalise le processus d'imagerie, réduisant ainsi le besoin de changements de filtre et permettant potentiellement de collecter davantage de données en une seule session d'imagerie.\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 Conçu pour être utilisé avec des caméras monochromes CCD ou CMOS. La taille de 2 pouces s'adapte aux roues à filtres standard et aux porte-oculaires de télescope. Vérifiez toujours les exigences spécifiques de votre équipement pour garantir un ajustement et des performances appropriés.\n\u003c\/p\u003e\n\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":47078711591197,"sku":"ASK-ASK2DNSOD2","price":447.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Color-Magic-D2-Filter.jpg?v=1699985639"},{"product_id":"askar-colour-magic-sii-oiii-c2-filter-2","title":"Filtre Askar Color Magic SII\/OIII C2 - 2\"","description":"\u003cul\u003e\n\n\u003cli\u003e\n\n Filtre duo-bande SII+OIII\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Améliore la qualité de l'image\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Transmission élevée supérieure à 90 % à sa longueur d'onde centrale\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Filtre sélectivement la pollution lumineuse \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\u003cli\u003e Caractéristiques \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 duo-bande Color Magic C2 2\" est un outil d'astrophotographie professionnel spécialement conçu pour l'imagerie du ciel profond. Le filtre duo-bande Color Magic C2 est un filtre SII+OIII. \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\n Remarque : le filtre duo-bande Color Magic C2 est un filtre SII+OIII.\n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv\u003e\n\n\u003ch3\u003e\n\n Utilitaire \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 \nLors de la prise de vue de galaxies du ciel profond avec des caméras couleur, un filtre duo-bande dans les bandes Hα + OⅢ est souvent utilisé ; alors qu'avec une caméra mono, un filtre à bande étroite dans les bandes Hα, SⅡ et OⅢ est souvent utilisé, laissant les utilisateurs de caméras couleur manquant une bande de détails de la nébuleuse. Ceci peut être compensé en utilisant le filtre à bande Duo Color Magic C (SⅡ+OIII) mentionné ci-dessus. \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=\"\u0026lt;!--nl--\u0026gt; Filtre Askar Color Magic SII\/OIII C2 - 2 pouces\u0026lt;!--nl--\u0026gt;       \" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/image_799x596.png?v=1705009186%0A%09%09%09%09%09%09%09\" 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 Améliorations \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=\"\u0026lt;!--nl--\u0026gt;Filtre Askar Color Magic SII\/OIII C2 - 2 pouces\u0026lt;!--nl--\u0026gt;\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/image_799x596.png?v=1705009186%0A\" 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 \nLe filtre Duo-bande Color Magic C2 (SII+OIII) a une transmission élevée de plus de 90 % à sa longueur d'onde centrale (500,7 nm et 672 nm). Il peut améliorer efficacement la qualité de l'image en rendant le fond du ciel plus sombre tout en maximisant le contraste dans toute l'image, en améliorant le contraste de vos images et en facilitant l'affichage des détails des étoiles. Dans les zones où la pollution lumineuse est très grave, ce filtre peut également filtrer sélectivement la pollution lumineuse et les signaux encombrés à travers les lumières d'émission de la nébuleuse pour obtenir l'effet de prise de vue idéal.\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\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003ctable\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eFabricant\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e Askar\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eFiltre\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e Filtre Duo-Bande C2 2\"\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eFWHM\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e Ha : 15 nm ± 3 nm\u003cbr\u003e O III : 35 nm ± 5 nm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eCWL\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e 500,7 nm et 672 nm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eTransmission\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e 90%\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eÉpaisseur\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e 2 ± 0,05 mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003ePropriété de la barrière\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e OD3 à 200-1000 nm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eFinition de surface\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e 60\/40\u003c\/td\u003e\n\n\n\u003c\/tr\u003e \n\n\u003c\/table\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":47429342691613,"sku":"ASK-ASKAR2DBC2","price":167.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image.png?v=1705009186"},{"product_id":"askar-colour-magic-sii-oiii-c1-filter-2","title":"Filtre Askar Color Magic Ha\/OIII C1 - 2\"","description":"\u003cul\u003e\n\n\u003cli\u003e\n\n Filtre duo-bande Ha+OIII\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Améliore la qualité de l'image\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Transmission élevée supérieure à 90 % à sa longueur d'onde centrale\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Filtre sélectivement la pollution lumineuse \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\u003cli\u003e Caractéristiques \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 duo-bande ColourMagic C1 2\" est un outil d'astrophotographie professionnel spécialement conçu pour l'imagerie du ciel profond. Le filtre duo-bande ColourMagic C1 est un filtre Ha+OIII. \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\n Remarque : le filtre duo-bande Color Magic C1 est un filtre Ha+OIII.\n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv\u003e\n\n\u003ch3\u003e\n\n Utilitaire \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 \nLe filtre double bande Color Magic C1 (Hα+OIII) a une transmission élevée de plus de 90 % à sa longueur d'onde centrale (500,7 nm et 656,6 nm). Il peut améliorer efficacement la qualité de l'image en rendant le fond du ciel plus sombre tout en maximisant le contraste dans toute l'image, en améliorant le contraste de vos images et en facilitant l'affichage des détails des étoiles. Dans les zones où la pollution lumineuse est très grave, ce filtre peut également filtrer sélectivement la pollution lumineuse et les signaux encombrés à travers les lumières d'émission de la nébuleuse pour obtenir l'effet de prise de vue idéal. \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=\"\u0026lt;!--nl--\u0026gt;Filtre Askar Color Magic Ha\/OIII C1 - 2 pouces\u0026lt;!--nl--\u0026gt;       \" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/image_8378cc30-ba51-4d4c-bfe1-c9fbd4710ebc_799x596.png?v=1705009394%0A%09%09%09%09%09%09%09\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003ctable\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eFabricant\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e Askar\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eFiltre\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e Filtre Duo-Bande C1 2\"\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eFWHM\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e Ha : 15 nm ± 3 nm\u003cbr\u003e O III : 35 nm ± 5 nm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eCWL\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e 500,7 nm et 656,6 nm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eTransmission\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e 90%\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eÉpaisseur\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e 2 ± 0,05 mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003ePropriété de la barrière\u003c\/b\u003e\n\u003c\/th\u003e\n\n\u003ctd\u003e OD3 à 200-1000 nm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e \u003cb\u003eFinition de surface\u003c\/b\u003e\n\u003c\/th\u003e \n\u003ctd\u003e60\/40 \u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":47429347672349,"sku":"ASK-ASKAR2DBC1","price":167.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image_8378cc30-ba51-4d4c-bfe1-c9fbd4710ebc.png?v=1705009394"},{"product_id":"askar-color-magic-ha-oiii-sii-oiii-c1-c2-filter-package","title":"Ensemble de filtres Askar Colour Magic Ha\/OIII et SII\/OIII (C1+C2)","description":"\u003cul\u003e\n\n\u003cli\u003e\n\n Pack double filtre pour l'astrophotographie : Ha\/OIII (C1) et SII\/OIII (C2)\n\n\u003c\/li\u003e\n\n\u003cli\u003e \nOptimisé pour capturer de superbes images de nébuleuse avec un contraste de couleurs amélioré \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 L'ensemble de filtres Askar Color Magic Ha\/OIII \u0026amp; SII\/OIII (C1+C2) est un ensemble spécialisé de filtres d'astrophotographie conçus pour capturer de superbes images de nébuleuses avec des couleurs vives et un contraste amélioré. Ce package comprend deux filtres : le Ha\/OIII (C1) et le SII\/OIII (C2), permettant aux astrophotographes de créer des images détaillées et colorées des nébuleuses en émission. \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\n Ces filtres sont conçus pour être utilisés avec des caméras monochromes. Assurez-vous de la compatibilité avec votre configuration d’imagerie avant l’achat.\n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv\u003e\n\n\u003ch3\u003e\n\n Spécifications 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 Le package comprend deux filtres spécialisés :\n 1. Ha\/OIII (C1) : combine les longueurs d’onde de l’hydrogène alpha et de l’oxygène III\n 2. SII\/OIII (C2) : combine les longueurs d'onde du soufre II et de l'oxygène III.\n Ces filtres sont conçus pour isoler des raies d'émission spécifiques que l'on trouve couramment dans les nébuleuses, permettant ainsi une imagerie détaillée et colorée. \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=\"Ensemble de filtres Askar Color Magic Ha\/OIII et SII\/OIII (C1+C2)\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/Askar-Color-Magic-Filter-Pack_475x475.png?v=1717083872\" 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 Contraste de couleur amélioré \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=\"Ensemble de filtres Askar Color Magic Ha\/OIII et SII\/OIII (C1+C2)\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/Askar-Color-Magic-Filter-Pack_475x475.png?v=1717083872\" 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 En combinant des longueurs d'onde spécifiques, ces filtres permettent aux astrophotographes de capturer des nébuleuses avec un contraste de couleurs et des détails améliorés. Le filtre Ha\/OIII met en évidence les régions rouges et bleu-vert, tandis que le filtre SII\/OIII met l'accent sur les zones rouge-orange et bleu-vert, ce qui donne des images visuellement saisissantes.\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 Optimisé pour l'imagerie à bande étroite\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Ces filtres sont spécialement conçus pour l'imagerie à bande étroite, permettant aux astrophotographes de capturer des images détaillées des nébuleuses en émission, même sous un ciel pollué par la lumière. Ils isolent efficacement les raies d’émission les plus importantes trouvées dans de nombreuses nébuleuses.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Construction de haute qualité\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Fabriqué avec du verre optique de précision et des revêtements de haute qualité pour garantir une excellente transmission de la lumière et des reflets minimes, résultant en des images nettes et contrastées.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Application polyvalente\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e \nConvient pour l'imagerie d'un large éventail d'objets du ciel profond, notamment les nébuleuses en émission, les restes de supernova et les nébuleuses planétaires. Ces filtres permettent des combinaisons de couleurs créatives et des techniques de traitement.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Flux de travail d'imagerie efficace\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n En combinant plusieurs lignes d'émission dans chaque filtre, le package Color Magic permet une acquisition de données plus efficace par rapport à l'imagerie traditionnelle à bande étroite avec des filtres à ligne unique.\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 Conçu pour être utilisé avec des caméras monochromes CCD ou CMOS. Vérifiez la taille du filtre et les spécifications du filetage pour garantir la compatibilité avec votre télescope ou votre système de caméra.\n\u003c\/p\u003e\n\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":48554702995741,"sku":"ASK-CM-C1C2","price":315.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Color-Magic-Filter-Pack.png?v=1717083872"},{"product_id":"askar-6nm-colour-magic-super-ha-oiii-d1-filter","title":"Filtre Askar Color Magic Super Ha\/OIII D1 6 nm - 2\"","description":"\u003cul\u003e\n\n\u003cli\u003eFiltre à double bande étroite de 6 nm de largeur de bande pour les longueurs d'onde Ha et OIII\u003c\/li\u003e\n\n\u003cli\u003e Taille de 2 pouces pour une compatibilité avec diverses configurations de télescopes\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\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\u003cul class=\"tabs-content\"\u003e\n\n\u003cli class=\"active\"\u003e\n\n\u003cp\u003e Le filtre Askar Colour Magic Super Ha\/OIII D1 6 nm est un filtre d'astrophotographie spécialisé de 5 cm (2 pouces) conçu pour capturer des images époustouflantes de nébuleuses en émission. Ce filtre à double bande étroite isole les raies d'émission H-alpha (Ha) et Oxygène III (OIII), permettant aux astrophotographes de créer des images détaillées et contrastées d'objets du ciel profond aux couleurs éclatantes. \u003c\/p\u003e\n\n\u003cdiv class=\"warning\"\u003e\n\n\u003cimg width=\"25px\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/warning-logo.svg?v=1714663206\" alt=\"Clause de non-responsabilité\"\u003e\n\u003cp\u003e Ce filtre est conçu pour être utilisé avec des caméras couleur. Assurez-vous de la compatibilité avec votre configuration d'imagerie avant l'achat.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003ch3\u003e Spécifications du filtre \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 Le filtre Askar Colour Magic Super SII\/OIII D1 présente une bande passante étroite de 6 nm, lui permettant d'isoler efficacement les raies d'émission Ha et OIII tout en bloquant la pollution lumineuse indésirable. Cette précision permet de produire des images très contrastées avec un excellent rapport signal\/bruit, même dans des conditions de ciel difficiles. \u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv style=\"text-align: start;\" class=\"image-side-2\" data-mce-style=\"text-align: start;\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/Askar-Color-Magic-D2-Filter_1000x1000.jpg?v=1699985639\" alt=\"Filtre Askar Colour Magic Super SII\/OIII D2 6 nm - 2\"\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv style=\"backgroundcolor: #0a0001; border-radius: 5px;\" data-mce-style=\"backgroundcolor: #0a0001; border-radius: 5px;\"\u003e\n\n\u003ch3 style=\"color: white!important;\"\u003e Performances à double bande étroite \u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cdiv class=\"two-columns-section\"\u003e\n\n\u003cdiv style=\"text-align: start;\" class=\"image-side-2\" data-mce-style=\"text-align: start;\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/Askar-Color-Magic-D2-Filter_1000x1000.jpg?v=1699985639\" alt=\"Filtre Askar Colour Magic Super SII\/OIII D2 6 nm - 2\"\u003e\u003c\/div\u003e\n\n\u003cdiv class=\"text-side-2\"\u003e\n\n\u003cp style=\"color: white!important;\"\u003e En combinant les longueurs d'onde SII et OIII dans un seul filtre, ce filtre D2 permet une acquisition de données plus efficace que l'utilisation de filtres à bande étroite individuels. Il capture simultanément les émissions rouge-orange (SII) et bleu-vert (OIII), permettant ainsi de créer des images en fausses couleurs saisissantes avec un temps d'exposition total réduit.\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\u003ch3\u003e Construction de haute qualité\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e Fabriqué avec un verre optique de précision et des revêtements diélectriques de haute qualité pour garantir une excellente transmission lumineuse et des reflets minimes, ce filtre est conçu pour conserver ses performances au fil du temps, résistant à la dégradation due à l'humidité ou aux variations de température.\u003c\/p\u003e\n\n\u003ch3\u003e Application polyvalente\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e Idéal pour l'imagerie d'un large éventail de nébuleuses en émission, de restes de supernova et de nébuleuses planétaires. Son format de 5 cm assure la compatibilité avec de nombreux télescopes et appareils photo, ce qui en fait un outil polyvalent à ajouter à la panoplie de tout astrophotographe.\u003c\/p\u003e\n\n\u003ch3\u003e Contraste amélioré\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e La bande passante étroite de 6 nm supprime efficacement la pollution lumineuse et la lueur du ciel, permettant des images à contraste élevé, même dans des zones polluées. Ce filtre est donc particulièrement utile pour les astrophotographes urbains et périurbains.\u003c\/p\u003e\n\n\u003ch3\u003e Flux de travail efficace\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e En capturant simultanément les données Ha et OIII, ce filtre rationalise le processus d'imagerie, réduisant le besoin de changements de filtre et permettant potentiellement de collecter davantage de données au cours d'une seule session d'imagerie.\u003c\/p\u003e\n\n\u003ch3\u003e Compatibilité\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e Conçu pour les caméras CCD ou CMOS monochromes. Le format 2 pouces est compatible avec les roues à filtres et les porte-oculaires de télescope standard. Vérifiez toujours les exigences spécifiques de votre équipement pour garantir un ajustement et des performances optimales.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":49387561124125,"sku":"ASK-ASK2DNHOD1","price":447.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Color-Magic-D2-Filter.jpg?v=1699985639"},{"product_id":"antlia-alp-t-dual-band-ha-oiii-3nm-sii-hb-3-5nm-2-filter-set","title":"Antlia ALP-T Dual Band Ha\u0026OIII 3nm + SII\u0026Hb 3.5nm 2\" Filter Set","description":"\u003cul class=\"DAV-feature-list\"\u003e\n    \u003cli\u003e\n        Precise Narrowband Filtering for Exceptional Contrast\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Enhanced Transmission for Superior Signal-to-Noise Ratio\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Anti-Reflection Coating to Reduce Halo Effect\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Optimized for Fast Optics up to f\/2\n    \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\u003eSpecifications\u003c\/li\u003e\n    \u003cli\u003eIn the Box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n    \u003cli class=\"active\"\u003e       \n        \u003cdiv\u003e\n            \u003c!-- Title image text --\u003e\n            \u003cdiv class=\"DAV-bg-light\"\u003e\n                \u003c!-- Main Image --\u003e\n                \u003cdiv class=\"DAV-section-center\"\u003e\n                    \u003ch2\u003eAntlia ALP-T Dual Band Ha\u0026amp;OIII 3nm + SII\u0026amp;Hb 3.5nm 2\" Filter Set - Overview\u003c\/h2\u003e\n                    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623174875.jpg?v=1733252057\" alt=\"Antlia ALP-T Dual Band Ha\u0026amp;OIII 3nm + SII\u0026amp;Hb 3.5nm 2inches Filter Set\" class=\"DAV-img-banner\"\u003e\n                    \u003cp\u003e\n                        The Antlia ALP-T Dual Band Filter Set is a high-performance toolset designed for astrophotographers who demand precision, contrast, and exceptional image quality. This set includes the Ha\u0026amp;OIII 3nm Filter and the SII\u0026amp;Hβ 3.5nm Filter, providing unmatched narrowband imaging capability for capturing deep-sky objects with remarkable clarity and detail.                    \n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003c!-- Features Grid --\u003e\n            \u003cdiv class=\"DAV-feature-grid\"\u003e\n                \u003c!-- Feature Box 1 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003ch3\u003eHigh Signal-to-Noise Ratio\u003c\/h3\u003e\n                    \u003cp\u003e\n                        Superior imaging in challenging light conditions.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n                \u003c!-- Feature Box 2 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003ch3\u003eVersatile Applications\u003c\/h3\u003e\n                    \u003cp\u003e\n                        Suitable for capturing traditional RGB images or creating artistic false-color palettes.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n                \u003c!-- Feature Box 3 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003ch3\u003eEasy Integration\u003c\/h3\u003e\n                    \u003cp\u003e\n                        Compatible with optics slower than f\/4, with high-speed versions available for faster setups.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003c!-- Title text image --\u003e\n            \u003cdiv class=\"DAV-bg-light DAV-section-center\"\u003e\n                \u003ch3\u003eWhy Choose the Antlia ALP-T Filter Set?\u003c\/h3\u003e\n                \u003cp\u003eCombining these filters allows astrophotographers to capture the four key emission lines (H-alpha, OIII, SII, Hβ) in unparalleled detail. The advanced multi-coating technology suppresses light pollution, moonlight, and airglow while delivering outstanding contrast and clarity. Whether you’re imaging from urban or rural locations, this filter set ensures breathtaking astrophotography results.\u003c\/p\u003e\n            \u003c\/div\u003e\n\n            \u003c!-- image text --\u003e\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003c!-- Image Section --\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" alt=\"Ha\u0026amp;Oiii\"\u003e\n                \u003c\/div\u003e\n\n                \u003c!-- Text Section --\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003eHa\u0026amp;OIII 3nm Filter\u003c\/h3\u003e                \n                    \u003cp\u003e\n                        This dual narrowband filter isolates the H-alpha (656.3nm) and OIII (500.7nm) emission lines, optimized for use with color cameras. With a Full Width Half Maximum (FWHM) bandwidth of 3nm, it effectively blocks unwanted wavelengths, including light pollution, moonlight, and airglow. The result is an enhanced signal-to-noise ratio and strikingly detailed nebula images.\n                    \u003c\/p\u003e\n                    \u003cul\u003e\n                        \u003cli\u003e\n\u003cb\u003ePrecise Transmission:\u003c\/b\u003e Passes H-alpha and OIII lines exclusively for improved contrast in celestial images.\u003c\/li\u003e\n                        \u003cli\u003e\n\u003cb\u003eExceptional Filtering:\u003c\/b\u003e Blocks optical density (OD) 4.5 on stray wavelengths, suppressing light pollution and enhancing nebula visibility.\u003c\/li\u003e\n                        \u003cli\u003e\n\u003cb\u003eIdeal for OSC Cameras:\u003c\/b\u003e Designed for color cameras, with applications in luminance filtering for monochrome cameras.\u003c\/li\u003e\n                        \u003cli\u003e\n\u003cb\u003eFlat-Top Bandpass:\u003c\/b\u003e Reduces spectrum shifts for consistent imaging performance, even under varying conditions.\u003c\/li\u003e\n                    \u003c\/ul\u003e\n                    \n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003c!-- image text --\u003e\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003c!-- Text Section --\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003eSII\u0026amp;Hβ 3.5nm Filter\u003c\/h3\u003e                \n                    \u003cp\u003e\n                        The SII\u0026amp;Hβ filter captures the deep red Sulfur-II (672.4nm) and blue Hydrogen-Beta (486.1nm) emission lines, providing complementary spectral data to the Ha\u0026amp;OIII filter. It’s perfect for creating detailed narrowband images and vibrant false-color palettes.\n                    \u003c\/p\u003e\n                    \u003cul\u003e\n                        \u003cli\u003e\n\u003cb\u003eDual Narrowband Capture:\u003c\/b\u003e Captures SII and H-beta lines simultaneously for rich spectral imaging.\u003c\/li\u003e\n                        \u003cli\u003e\n\u003cb\u003eEnhanced Imaging Contrast:\u003c\/b\u003e Blocks optical density (OD) 4.5 on unwanted wavelengths, optimizing contrast even in light-polluted conditions.\u003c\/li\u003e\n                        \u003cli\u003e\n\u003cb\u003eCreative Color Palettes:\u003c\/b\u003e Enables various combinations like H-O-Hβ or S-H-O for unique astrophotography.\u003c\/li\u003e\n                    \u003c\/ul\u003e        \n                \u003c\/div\u003e\n                \u003c!-- Image Section --\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" alt=\"Sii\u0026amp;Hb\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n        \u003c\/div\u003e\n    \u003c\/li\u003e\n\n    \u003cli\u003e\n        \u003ch2\u003eHa\u0026amp;OIII 3nm Filter\u003c\/h2\u003e\n        \u003ctable class=\"DAV-specifications\"\u003e\n            \u003ctbody\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eFWHM\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e3nm\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003ePeak Transmission\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e90% (H-alpha), 82% (OIII)\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eBlocking\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e≥ OD4.5 (300-1100nm)\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eFilter Thickness\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e2mm\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eRing Design\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eUltra-thin filter cell with M48*0.75 thread to reduce vignetting\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003c!-- Add more rows as needed --\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n\n        \u003ch2\u003eSII\u0026amp;Hβ 3.5nm Filter\u003c\/h2\u003e\n        \u003ctable class=\"DAV-specifications\"\u003e\n            \u003ctbody\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eFWHM\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e3.5mm\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003ePeak Transmission\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e90% (SII), 85% (Hβ)\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eBlocking\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e≥ OD4.5 (300-1100nm)\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eRing Design\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eUltra-thin and black anodized to minimize reflections\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003c!-- Add more rows as needed --\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n    \u003c\/li\u003e\n    \n    \u003cli\u003e\n        \u003cul class=\"DAV-grid\"\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" alt=\"HaOIII\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003eHa\u0026amp;OIII 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                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" alt=\"SiiHb\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003eSii\u0026amp;Hb Filter\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\n        \u003c\/ul\u003e          \n    \u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"Antlia","offers":[{"title":"Default Title","offer_id":49428759281949,"sku":"ANT-ALP-T-3NM-KIT","price":1008.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_0b67e995-1011-4adb-9f12-948552797683.webp?v=1733252577"},{"product_id":"antlia-alp-t-dual-band-ha-oiii-3nm-filter","title":"Antlia ALP-T Dual Band Ha\u0026OIII 3nm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n    \u003cli\u003e\n        Precise Narrowband Filtering for Exceptional Contrast\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Enhanced Transmission for Superior Signal-to-Noise Ratio\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Anti-Reflection Coating to Reduce Halo Effect\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Optimized for Fast Optics up to f\/2\n    \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\u003eSpecifications\u003c\/li\u003e\n    \u003cli\u003eIn the Box\u003c\/li\u003e\n    \u003c!--\u003cli\u003eDownloads\u003c\/li\u003e--\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n    \u003cli class=\"active\"\u003e       \n        \u003cdiv\u003e\n            \u003c!-- Title image text --\u003e\n            \u003cdiv class=\"DAV-bg-light\"\u003e\n                \u003c!-- Main Image --\u003e\n                \u003cdiv class=\"DAV-section-center\"\u003e\n                    \u003ch2\u003eAntlia ALP-T Dual Band Ha\u0026amp;OIII 3nm - Overview\u003c\/h2\u003e\n        \n                    \u003cp\u003e\n                        The Antlia ALP-T Dual Band Filter Set is a high-performance toolset designed for astrophotographers who demand precision, contrast, and exceptional image quality. This set includes the Ha\u0026amp;OIII 3nm Filter and the SII\u0026amp;Hβ 3.5nm Filter, providing unmatched narrowband imaging capability for capturing deep-sky objects with remarkable clarity and detail.                    \n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003c!-- Features Grid --\u003e\n            \u003cdiv class=\"DAV-feature-grid\"\u003e\n                \u003c!-- Feature Box 1 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003c!--\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623174875.jpg?v=1733252057\" alt=\"Feature 3\" class=\"DAV-feature-img\"\u003e--\u003e\n                    \u003ch3\u003eHigh Signal-to-Noise Ratio\u003c\/h3\u003e\n                    \u003cp\u003e\n                        Superior imaging in challenging light conditions.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n                \u003c!-- Feature Box 2 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003c!--\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623174875.jpg?v=1733252057\" alt=\"Feature 3\" class=\"DAV-feature-img\"\u003e--\u003e\n                    \u003ch3\u003eVersatile Applications\u003c\/h3\u003e\n                    \u003cp\u003e\n                        Suitable for capturing traditional RGB images or creating artistic false-color palettes.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n                \u003c!-- Feature Box 3 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003c!--\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623174875.jpg?v=1733252057\" alt=\"Feature 3\" class=\"DAV-feature-img\"\u003e--\u003e\n                    \u003ch3\u003eEasy Integration\u003c\/h3\u003e\n                    \u003cp\u003e\n                        Compatible with optics slower than f\/4, with high-speed versions available for faster setups.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003c!--\n            \u003cdiv class=\"DAV-bg-light DAV-section-center\"\u003e\n                \u003ch3\u003eWhy Choose the Antlia ALP-T Filter Set?\u003c\/h3\u003e\n                \u003cp\u003eCombining these filters allows astrophotographers to capture the four key emission lines (H-alpha, OIII, SII, Hβ) in unparalleled detail. The advanced multi-coating technology suppresses light pollution, moonlight, and airglow while delivering outstanding contrast and clarity. Whether you’re imaging from urban or rural locations, this filter set ensures breathtaking astrophotography results.\u003c\/p\u003e\n                \u003cdiv class=\"DAV-grid-img\"\u003e\n                    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" alt=\"Highlight 1\"\u003e\n                    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" alt=\"Highlight 2\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n            --\u003e\n            \n            \u003c!-- image text --\u003e\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003c!-- Image Section --\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" alt=\"Ha\u0026amp;Oiii\"\u003e\n                \u003c\/div\u003e\n\n                \u003c!-- Text Section --\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003eHa\u0026amp;OIII 3nm Filter\u003c\/h3\u003e                \n                    \u003cp\u003e\n                        This dual narrowband filter isolates the H-alpha (656.3nm) and OIII (500.7nm) emission lines, optimized for use with color cameras. With a Full Width Half Maximum (FWHM) bandwidth of 3nm, it effectively blocks unwanted wavelengths, including light pollution, moonlight, and airglow. The result is an enhanced signal-to-noise ratio and strikingly detailed nebula images.\n                    \u003c\/p\u003e\n                    \u003cul\u003e\n                        \u003cli\u003e\n\u003cb\u003ePrecise Transmission:\u003c\/b\u003e Passes H-alpha and OIII lines exclusively for improved contrast in celestial images.\u003c\/li\u003e\n                        \u003cli\u003e\n\u003cb\u003eExceptional Filtering:\u003c\/b\u003e Blocks optical density (OD) 4.5 on stray wavelengths, suppressing light pollution and enhancing nebula visibility.\u003c\/li\u003e\n                        \u003cli\u003e\n\u003cb\u003eIdeal for OSC Cameras:\u003c\/b\u003e Designed for color cameras, with applications in luminance filtering for monochrome cameras.\u003c\/li\u003e\n                        \u003cli\u003e\n\u003cb\u003eFlat-Top Bandpass:\u003c\/b\u003e Reduces spectrum shifts for consistent imaging performance, even under varying conditions.\u003c\/li\u003e\n                    \u003c\/ul\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003c!--\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003eSII\u0026Hβ 3.5nm Filter\u003c\/h3\u003e                \n                    \u003cp\u003e\n                        The SII\u0026Hβ filter captures the deep red Sulfur-II (672.4nm) and blue Hydrogen-Beta (486.1nm) emission lines, providing complementary spectral data to the Ha\u0026OIII filter. It’s perfect for creating detailed narrowband images and vibrant false-color palettes.\n                    \u003c\/p\u003e\n                    \u003cul\u003e\n                        \u003cli\u003e\u003cb\u003eDual Narrowband Capture:\u003c\/b\u003e Captures SII and H-beta lines simultaneously for rich spectral imaging.\u003c\/li\u003e\n                        \u003cli\u003e\u003cb\u003eEnhanced Imaging Contrast:\u003c\/b\u003e Blocks optical density (OD) 4.5 on unwanted wavelengths, optimizing contrast even in light-polluted conditions.\u003c\/li\u003e\n                        \u003cli\u003e\u003cb\u003eCreative Color Palettes:\u003c\/b\u003e Enables various combinations like H-O-Hβ or S-H-O for unique astrophotography.\u003c\/li\u003e\n                    \u003c\/ul\u003e        \n                \u003c\/div\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" alt=\"Sii\u0026Hb\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n            --\u003e\n\n        \u003c\/div\u003e\n    \u003c\/li\u003e\n\n    \u003cli\u003e\n        \u003ch2\u003eHa\u0026amp;OIII 3nm Filter\u003c\/h2\u003e\n        \u003ctable class=\"DAV-specifications\"\u003e\n            \u003ctbody\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eFWHM\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e3nm\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003ePeak Transmission\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e90% (H-alpha), 82% (OIII)\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eBlocking\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e≥ OD4.5 (300-1100nm)\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eFilter Thickness\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e2mm\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eRing Design\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eUltra-thin filter cell with M48*0.75 thread to reduce vignetting\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003c!-- Add more rows as needed --\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n        \u003c!--\n        \u003ch2\u003eSII\u0026Hβ 3.5nm Filter\u003c\/h2\u003e\n        \u003ctable class=\"DAV-specifications\"\u003e\n            \u003ctbody\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eFWHM\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e3.5mm\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003ePeak Transmission\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e90% (SII), 85% (Hβ)\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eBlocking\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003e≥ OD4.5 (300-1100nm)\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eRing Design\u003c\/p\u003e\n                    \u003c\/td\u003e\n                    \u003ctd\u003e\n                        \u003cp\u003eUltra-thin and black anodized to minimize reflections\u003c\/p\u003e\n                    \u003c\/td\u003e\n                \u003c\/tr\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n        --\u003e\n    \u003c\/li\u003e\n    \n    \u003cli\u003e\n        \u003cul class=\"DAV-grid\"\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" alt=\"HaOIII\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003eHa\u0026amp;OIII Filter\u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            \u003c!--\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" alt=\"SiiHb\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003eSii\u0026Hb Filter\u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            --\u003e\n        \u003c\/ul\u003e          \n    \u003c\/li\u003e\n    \u003c!--\n    \u003cli\u003e\n        \u003cul class=\"DAV-grid\"\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003ca href=\"\" target=\"_blank\"\u003e\n                    \u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" 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\"\/\u003e\u003c\/svg\u003e\n                    \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n                \u003c\/div\u003e\n                \u003c\/a\u003e\n            \u003c\/li\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003ca href=\"\" target=\"_blank\"\u003e\n                    \u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\/\u003e\u003c\/svg\u003e                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n                \u003c\/div\u003e\n                \u003c\/a\u003e\n            \u003c\/li\u003e\n        \u003c\/ul\u003e\n    \u003c\/li\u003e\n    --\u003e\n\u003c\/ul\u003e\n","brand":"Antlia","offers":[{"title":"Default Title","offer_id":49428837531933,"sku":"ANT-ALP-T-3NM-HAOIII","price":554.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_0b67e995-1011-4adb-9f12-948552797683.webp?v=1733252577"},{"product_id":"antlia-alp-t-dual-band-sii-hb-3-5nm","title":"Antlia ALP-T Dual Band SII\u0026Hβ 3.5nm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003ePrecise Narrowband Filtering for Exceptional Contrast\u003c\/li\u003e\n\u003cli\u003eEnhanced Transmission for Superior Signal-to-Noise Ratio\u003c\/li\u003e\n\u003cli\u003eAnti-Reflection Coating to Reduce Halo Effect\u003c\/li\u003e\n\u003cli\u003eOptimized for Fast Optics up to f\/2\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\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003c!-- Title image text --\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003c!-- Main Image --\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAntlia ALP-T Dual Band SII\u0026amp;Hβ 3.5nm - Overview\u003c\/h2\u003e\n\u003cp\u003eThe Antlia ALP-T Dual Band Filter Set is a high-performance toolset designed for astrophotographers who demand precision, contrast, and exceptional image quality. This set includes the Ha\u0026amp;OIII 3nm Filter and the SII\u0026amp;Hβ 3.5nm Filter, providing unmatched narrowband imaging capability for capturing deep-sky objects with remarkable clarity and detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Features Grid --\u003e\n\u003cdiv class=\"DAV-feature-grid\"\u003e\n\u003c!-- Feature Box 1 --\u003e\n\u003cdiv class=\"DAV-feature-box\"\u003e\n\u003ch3\u003eHigh Signal-to-Noise Ratio\u003c\/h3\u003e\n\u003cp\u003eSuperior imaging in challenging light conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Feature Box 2 --\u003e\n\u003cdiv class=\"DAV-feature-box\"\u003e\n\u003ch3\u003eVersatile Applications\u003c\/h3\u003e\n\u003cp\u003eSuitable for capturing traditional RGB images or creating artistic false-color palettes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Feature Box 3 --\u003e\n\u003cdiv class=\"DAV-feature-box\"\u003e\n\u003ch3\u003eEasy Integration\u003c\/h3\u003e\n\u003cp\u003eCompatible with optics slower than f\/4, with high-speed versions available for faster setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003eSII\u0026amp;Hβ 3.5nm Filter\u003c\/h3\u003e\n\u003cp\u003eThe SII\u0026amp;Hβ filter captures the deep red Sulfur-II (672.4nm) and blue Hydrogen-Beta (486.1nm) emission lines, providing complementary spectral data to the Ha\u0026amp;OIII filter. It’s perfect for creating detailed narrowband images and vibrant false-color palettes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDual Narrowband Capture:\u003c\/b\u003e Captures SII and H-beta lines simultaneously for rich spectral imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEnhanced Imaging Contrast:\u003c\/b\u003e Blocks optical density (OD) 4.5 on unwanted wavelengths, optimizing contrast even in light-polluted conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCreative Color Palettes:\u003c\/b\u003e Enables various combinations like H-O-Hβ or S-H-O for unique astrophotography.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-img\"\u003e\u003cimg alt=\"Sii\u0026amp;Hb\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch2\u003eSII\u0026amp;Hβ 3.5nm Filter\u003c\/h2\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eFWHM\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e3.5mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003ePeak Transmission\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e90% (SII), 85% (Hβ)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eBlocking\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e≥ OD4.5 (300-1100nm)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003eRing Design\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eUltra-thin and black anodized to minimize reflections\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\n\u003cimg class=\"DAV-img-box\" alt=\"HaOIII\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_67b5496f-f728-4fd1-b82a-563e5e8c9962.webp?v=1733252057\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSII\u0026amp;Hβ Filter\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\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":49428843594013,"sku":"ANT-ALP-T-3NM-SIIHB","price":511.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-filter-3nm-ha-oiii-antlia-alp-t-dual-band-highspeed-3nm-ha-oiii-3-5nm-sii-hb-2-mounted-filters-42550623338715_1024x_0b67e995-1011-4adb-9f12-948552797683.webp?v=1733252577"},{"product_id":"optolong-l-para-ha-oiii-10nm-filter-2","title":"Optolong L-Para HA\/OIII 10nm Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual Narrowband H-Alpha \u0026amp; OIII Filter\u003c\/li\u003e\n\u003cli\u003eSuppresses Mercury, Sodium \u0026amp; LED Light Pollution\u003c\/li\u003e\n\u003cli\u003eOptimized for Fast-Ratio Systems (RASA, HyperStar)\u003c\/li\u003e\n\u003cli\u003eAdvanced Anti-Halo Optical Design\u003c\/li\u003e\n\u003cli\u003eDurable Ion-Assisted Deposition Coatings\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-Para HA\/OIII 10nm Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Optolong L-Para HA\/OIII filter is a dual narrowband filter designed to isolate critical nebula emission lines from hydrogen-alpha and oxygen-III. It aggressively suppresses common sources of urban light pollution, including mercury-vapor, sodium, and LED streetlights. This targeted filtration darkens the sky background, significantly increasing the contrast of emission nebulae for more detailed and vibrant astrophotography.\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-Bandpass Design for High-Contrast Nebula Imaging\u003c\/h3\u003e\n\u003cp\u003eThe L-Para filter targets the two most prominent emission lines in most nebulae—Hydrogen-alpha and Oxygen-III. By selectively passing light from these wavelengths while rejecting the rest of the spectrum, it renders the sky background exceptionally dark. This approach dramatically enhances the contrast between your deep-sky target and the surrounding sky, revealing faint structures that would otherwise be lost to light pollution.\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\u003eUniversal Compatibility: Engineered for Fast and Standard Telescopes\u003c\/h3\u003e\n\u003cp\u003eA key design goal for the L-Para was compatibility across a wide range of instruments. It is engineered to maintain high transmission rates and color fidelity not only in standard focal ratio telescopes but also in very fast optical systems like RASA or HyperStar setups. The filter's performance holds up even when receiving steep, oblique light rays, ensuring one filter can serve your entire collection of telescopes without compromise.\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 Halo Suppression for Cleaner Stars\u003c\/h3\u003e\n\u003cp\u003eHalos around bright stars can obscure faint, nearby nebulosity and detract from the final image. The Optolong L-Para features an optimized coating stack specifically designed to minimize these artifacts. This meticulous anti-halo engineering results in cleaner, more precise star images and ensures that the delicate details of your target nebula remain the central focus.\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 for Lasting Reliability\u003c\/h3\u003e\n\u003cp\u003eOptolong utilizes an ion-assisted deposition coating process to produce the L-Para filter. This advanced technique creates a hard, dense coating that is highly resistant to scratching and environmental degradation. The result is a filter with stable, consistent wavelength transmission that will not deviate with temperature changes, providing reliable imaging results for years to come.\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 Optolong L-Para filter best for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Optolong L-Para is specifically designed for imaging \u003cstrong\u003eemission nebulae\u003c\/strong\u003e, which are rich in Hydrogen-alpha and Oxygen-III light. It excels on targets like the Orion Nebula (M42), the Lagoon Nebula (M8), and the North American Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Optolong L-Para improve images from light-polluted skies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt uses a dual narrowband design that selectively passes light from \u003cstrong\u003eHa and OIII\u003c\/strong\u003e while blocking broad-spectrum light from artificial sources like mercury, sodium, and LED streetlights. This darkens the sky background and dramatically boosts the contrast of your target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Optolong L-Para work with my fast f\/2 RASA telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the L-Para is engineered for compatibility with a wide range of optical systems, including very fast focal ratios like those found on \u003cstrong\u003eRASA and HyperStar systems\u003c\/strong\u003e. It's designed to maintain high transmission and avoid band-shifting even with the steep light cones from these instruments.\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-Para for imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can, it's not ideal. The L-Para is a narrowband filter that blocks most of the light from \u003cstrong\u003ebroadband targets like galaxies\u003c\/strong\u003e, which emit light across the entire visible spectrum. For galaxies, a broadband light pollution filter or unfiltered imaging from a dark site is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Optolong L-Para's halo control notable?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOptolong has specifically optimized the L-Para's coating design to \u003cstrong\u003esuppress halos\u003c\/strong\u003e, which are the rings of light that can appear around very bright stars. This results in cleaner star fields and prevents nebulosity near bright stars from being obscured.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Optolong L-Para a good choice for a one-shot-color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. Dual narrowband filters like the L-Para are an excellent match for \u003cstrong\u003eone-shot-color (OSC) cameras\u003c\/strong\u003e. They allow you to capture both Ha and OIII data simultaneously, simplifying your workflow and producing dramatic, high-contrast nebula images even from urban locations.\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":50077460758813,"sku":"OPT-AS100221","price":362.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Para-Filter.png?v=1750275530"},{"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":"askar-3nm-colour-magic-ultra-ha-oiii-e1-filter-2","title":"Askar 3nm Colour Magic Ultra Ha\/OIII E1 Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual-bandpass for Hydrogen-alpha (656.6nm) and Oxygen-III (500.7nm)\u003c\/li\u003e\n\u003cli\u003eUltra-narrow 3.7nm (Ha) and 4.0nm (OIII) FWHM bandwidths\u003c\/li\u003e\n\u003cli\u003e85% peak transmittance at both center wavelengths\u003c\/li\u003e\n\u003cli\u003e≥OD5 blocking from 200-1100nm to suppress star halos\u003c\/li\u003e\n\u003cli\u003e2-inch mounted format with 1.85mm glass thickness\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\u003eAskar 3nm Colour Magic Ultra Ha\/OIII E1 Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Askar 3nm Colour Magic Ultra E1 filter isolates critical nebulae emission lines with its ultra-narrow 3.7nm Hydrogen-alpha and 4.0nm Oxygen-III bandpasses. It achieves a peak transmittance of 85% at both the 656.6nm and 500.7nm center wavelengths, maximizing signal capture from emission targets. With off-band blocking rated at ≥OD5 from 200-1100nm, this filter delivers exceptionally high-contrast images by suppressing light pollution, moonlight, and unwanted starlight.\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-Bandpass Imaging with 85% Peak Transmittance\u003c\/h3\u003e\n\u003cp\u003eDesigned for one-shot color cameras, the Ultra E1 captures the two most important emission lines simultaneously, drastically reducing total imaging time. By passing light at both 656.6nm (Ha) and 500.7nm (OIII) with 85% efficiency, you gather data for both the red and blue-green structures of targets like the Veil Nebula or the Rosette Nebula (NGC 2237) in a single set of exposures. This dual-band approach streamlines your workflow without compromising signal strength.\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\u003e3.7nm \u0026amp; 4.0nm Bandwidths for Extreme Light Pollution Rejection\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of this filter is its extremely narrow full-width at half-maximum (FWHM). The 3.7nm band for Ha and 4.0nm for OIII aggressively reject unwanted light, including severe urban light pollution and natural skyglow. This surgical isolation of the nebula's signal creates a jet-black sky background, making faint, wispy details pop with dramatic contrast even from city backyards.\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\u003eOD5 Blocking and 30\" Parallelism for Halo-Free Stars\u003c\/h3\u003e\n\u003cp\u003eOptical precision extends beyond the passbands. The filter provides ≥OD5 blocking across the wide 200-1100nm spectrum, ensuring that stray UV and IR light, which can cause halos on bright stars, never reaches the sensor. A parallelism of 30 arcseconds guarantees the filter will not introduce distortions or degrade the sharpness of your optical system, maintaining pinpoint stars across the field of view.\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\u003eAskar 3nm Ultra vs. Wider Dual-Band Filters: Contrast and Star Size\u003c\/h3\u003e\n\u003cp\u003eCompared to filters with 7nm or wider bandpasses, the Askar 3nm Ultra E1 offers a significant advantage in signal-to-noise ratio under light-polluted skies. The trade-off for this extreme contrast is a slight reduction in star brightness and potentially longer sub-exposure times to achieve the same signal level.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAskar 3nm Ultra E1:\u003c\/strong\u003e Delivers maximum nebula contrast by eliminating more background light. It is the superior choice for imaging from Bortle 7-9 locations or during bright moon phases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWider Dual-Band Filters:\u003c\/strong\u003e Capture signal faster and often produce smaller, more natural-looking stars, as very narrow filters can sometimes slightly bloat the brightest stars due to diffraction effects. They are excellent for dark sky sites where light pollution is less of a concern.\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\"\u003eIs the Askar 3nm Ultra E1 filter effective in Bortle 8 or 9 skies?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The ultra-narrow 3.7nm and 4.0nm bandwidths are specifically designed for this purpose. The Askar Ultra E1 excels at isolating the specific wavelengths of light from emission nebulae while aggressively blocking the broad-spectrum glow from city lights, making it one of the most effective tools for imaging from heavily 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 Askar 3nm Ultra E1 filter perform on the Trifid Nebula (M20) with my f\/7 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar Ultra E1 is an excellent choice for the Trifid Nebula (M20). It will cleanly separate the red hydrogen-alpha emission region from the blue-green oxygen-III structures with a one-shot color camera. In an f\/7 system, you won't have issues with band-shifting, and the filter's high 85% transmittance will help capture good signal despite the slower focal ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are the bandwidths for the Askar Ultra E1 filter different for Ha (3.7nm) and OIII (4.0nm)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a deliberate optical design choice. The OIII emission line is often fainter than Ha in many nebulae, so providing a slightly wider 4.0nm bandpass allows more OIII signal to be collected, helping to balance the final color image. The Ha line is typically stronger, so a tighter 3.7nm band can be used for maximum contrast without sacrificing too much signal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a monochrome camera to use the Askar 3nm Ultra E1 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter is specifically designed for use with \u003cstrong\u003eone-shot color (OSC) cameras\u003c\/strong\u003e. It passes both red (Ha) and blue-green (OIII) light simultaneously, which are then captured by the corresponding pixels on your color sensor to create a rich color image with minimal processing effort.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the ≥OD5 blocking specification mean for my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD5 (Optical Density 5)\u003c\/strong\u003e means the filter blocks at least 99.999% of unwanted light outside its designated passbands. For astrophotography, this is critical for preventing halos around bright stars, which are often caused by out-of-focus UV and Infrared light that your telescope's optics were not designed to correct. This deep blocking ensures clean, high-contrast results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 2\" Askar Ultra E1 filter work with a full-frame sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 2-inch mounted format is designed to be large enough to fully illuminate full-frame sensors (36mm x 24mm) without vignetting, assuming it is placed correctly in the optical train, such as in a filter drawer or wheel close to the sensor.\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\u003eFWHM (Full-Width Half-Maximum)\u003c\/td\u003e\n\u003ctd\u003eHa: 3.7nm ± 0.3nm \/ OIII: 4.0nm ± 0.3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e656.6nm (Ha) \u0026amp; 500.7nm (OIII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e≥85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-Band Blocking\u003c\/td\u003e\n\u003ctd\u003e≥OD5 (Optical Density 5) @ 200-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85 ± 0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30 arcseconds\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\"\u003eAskar 3nm Colour Magic Ultra Ha\/OIII E1 Filter - 2\"\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\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software \u0026amp; Drivers\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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":50344440856861,"sku":"ASK-ASKAR2DBE1","price":847.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Colour-Magic-E1-Filter.jpg?v=1757644549"},{"product_id":"askar-3nm-colour-magic-ultra-oiii-sii-e1-filter-2","title":"Askar 3nm Colour Magic Ultra OIII\/SII E2 Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDual-bandpass design captures OIII (500.7nm) and SII (672nm) simultaneously\u003c\/li\u003e\n\u003cli\u003eNarrow 3.7nm (OIII) and 4.0nm (SII) FWHM for high-contrast imaging\u003c\/li\u003e\n\u003cli\u003ePeak transmittance of 85% ensures high signal throughput\u003c\/li\u003e\n\u003cli\u003eDeep ≥OD5 blocking from 200-1100nm eliminates unwanted light pollution\u003c\/li\u003e\n\u003cli\u003eStandard 2\" filter format with 1.85mm substrate thickness\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\u003eAskar 3nm Colour Magic Ultra OIII\/SII E2 Filter - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Askar 3nm Colour Magic Ultra OIII\/SII E2 Filter is engineered to solve a common problem for color camera imagers: capturing the full Hubble Palette. This dual-bandpass filter isolates nebula emissions at 500.7nm (OIII) and 672nm (SII) with narrow 3.7nm and 4.0nm bandpasses, respectively. With a peak transmittance of 85% and deep OD5 blocking across the 200-1100nm spectrum, this filter allows you to gather the missing Sulfur-II data needed for SHO compositions, even from light-polluted locations.\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 672nm + 500.7nm Solution for Color Camera SHO Imaging\u003c\/h3\u003e\n\u003cp\u003eWhile standard duo-narrowband filters for color cameras typically capture Hydrogen-alpha and Oxygen-III, they leave out the critical Sulfur-II signal. The Askar Ultra E2 filter is designed specifically to fill this gap. By passing light at 672nm (SII) and 500.7nm (OIII), it allows you to collect the remaining two channels for a full SHO dataset without a filter wheel or monochrome camera.\u003c\/p\u003e\n\u003cp\u003eCombine the data from this filter with Hydrogen-alpha data (captured separately or with an Hα\/OIII filter) to unlock vibrant, detailed SHO images. This approach makes the celebrated Hubble Palette accessible and efficient for anyone using a one-shot-color astronomy camera.\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\u003e3.7nm \u0026amp; 4.0nm Bandpasses for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eThis filter achieves its high contrast through extremely narrow full-width at half-maximum (FWHM) values: 3.7nm for OIII and 4.0nm for SII. These tight bandpasses aggressively reject streetlights, moonlight, and natural skyglow, causing faint nebula structures to stand out against a dark background. The ≥OD5 blocking from 200nm to 1100nm ensures no out-of-band wavelengths contaminate the image.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak Transmittance (85%):\u003c\/strong\u003e Despite the narrow bandpasses, the filter allows 85% of the crucial OIII and SII light to reach your sensor, preventing excessively long exposure times.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHalo Control:\u003c\/strong\u003e As part of Askar's \"Ultra\" series, this filter is optimized to minimize halos around bright stars, a common issue with narrowband filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Substrate:\u003c\/strong\u003e The filter is built on a glass substrate with a parallelism of 30 arcseconds, maintaining the sharpness of your optical system.\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 primary purpose of the Askar Ultra E2 OIII\/SII filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar Ultra E2 is a specialized dual-narrowband filter designed for \u003cstrong\u003ecolor camera users\u003c\/strong\u003e who want to capture images in the Hubble Palette (SHO). It isolates the Oxygen-III (OIII) and Sulfur-II (SII) emission lines, allowing you to collect the \"S\" and \"O\" channels to complement your Hydrogen-alpha (\"H\") data.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I create an SHO image with the Askar Ultra E2 and a color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need to capture two sets of images. First, use a filter that passes Hydrogen-alpha (like an L-eXtreme, L-eNhance, or a dedicated Hα filter) to get your \"H\" data. Second, use this Askar Ultra E2 filter to capture your \"S\" and \"O\" data simultaneously. In post-processing, you will split the channels from both images and combine them using a tool like PixInsight's ChannelCombination to assign Hα to Red, SII to Green, and OIII to Blue (or any variation you prefer).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar Ultra E2 filter with a monochrome camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is designed for color cameras, you can use it with a monochrome camera. However, because it passes both OIII and SII light at the same time, you cannot separate the two signals onto the mono sensor. For monochrome imaging, using individual OIII and SII filters is the standard and more flexible approach.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Askar Ultra E2 filter have 3.7nm and 4.0nm bandpasses instead of just \"3nm\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \"3nm\" is a class or series designation. The actual measured FWHM is \u003cstrong\u003e3.7nm ± 0.3nm for OIII\u003c\/strong\u003e and \u003cstrong\u003e4.0nm ± 0.3nm for SII\u003c\/strong\u003e. These precise, ultra-narrow bandpasses are what provide the exceptional contrast and light pollution rejection by isolating the specific nebula emission lines from background skyglow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Askar Ultra E2 filter perform on the Wizard Nebula (NGC 7380) from a city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Wizard Nebula (NGC 7380) is rich in all three SHO gasses. From a city, the Askar Ultra E2 filter's narrow 3.7nm\/4.0nm bandpasses would be highly effective at cutting through light pollution to reveal the intricate structures in the OIII and SII regions. It would darken the sky background significantly, increasing the contrast and making the faint nebulosity visible in your exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Askar Ultra E2 filter work well with my fast f\/4 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUltra-narrowband filters like this one can experience some band-shifting with very fast optical systems (typically f\/4 and below). While it will still provide a significant contrast boost, you may see a slight reduction in transmission compared to its peak 85% rating. The filter's performance is optimal for systems at f\/4.5 and slower, but it remains a powerful tool for light pollution suppression even on faster scopes.\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\u003eFWHM (OIII)\u003c\/td\u003e\n\u003ctd\u003e3.7nm ± 0.3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM (SII)\u003c\/td\u003e\n\u003ctd\u003e4.0nm ± 0.3nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelength (CWL)\u003c\/td\u003e\n\u003ctd\u003e500.7nm (OIII) \u0026amp; 672nm (SII)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Property\u003c\/td\u003e\n\u003ctd\u003e≥OD5 @ 200-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85 ± 0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30″\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\"\u003eAskar 3nm Colour Magic Ultra OIII\/SII E2 Filter - 2\"\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\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software \u0026amp; Drivers\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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":50344442036509,"sku":"ASK-ASKAR2DBE2","price":847.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Colour-Magic-E2-Filter.jpg?v=1757644814"},{"product_id":"askar-3nm-colour-magic-ha-oiii-sii-oiii-e1-e2-filter-package","title":"Askar 3nm Colour Magic Ha\/OIII \u0026 SII\/OIII (E1+E2) Filter Package","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables SHO \"Hubble Palette\" imaging with a one-shot-color (OSC) camera\u003c\/li\u003e\n\u003cli\u003eIncludes two 3nm dual-bandpass filters: E1 (Hα+OIII) and E2 (SII+OIII)\u003c\/li\u003e\n\u003cli\u003eIsolates all three key emission lines (H-alpha, O-III, S-II) across two exposures\u003c\/li\u003e\n\u003cli\u003e\"Ultra E\" design provides advanced halo suppression around bright stars\u003c\/li\u003e\n\u003cli\u003eMaximizes contrast for deep-sky imaging from light-polluted locations\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\u003eAskar 3nm Colour Magic Ha\/OIII \u0026amp; SII\/OIII (E1+E2) Filter Package\u003c\/h2\u003e\n\u003cp\u003eThe Askar 3nm Colour Magic Filter Package uses two distinct 3nm dual-bandpass filters to let you capture all three key narrowband emission lines required for Hubble Palette images with a single color camera. This two-filter system, consisting of the E1 (Hα+OIII) and E2 (SII+OIII) filters, isolates data from hydrogen, oxygen, and sulfur, creating a streamlined workflow that was previously only possible with a monochrome camera and filter wheel.\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 3nm Colour Magic System: SHO Palette Imaging with Your OSC Camera\u003c\/h3\u003e\n\u003cp\u003eThis filter set fundamentally changes the capability of a one-shot-color (OSC) camera. By separating the H-alpha and SII signals into two different filters—while capturing OIII data with both—you can effectively assign each channel to a specific color in post-processing to create SHO images.\u003c\/p\u003e\n\u003cp\u003eThe tight 3nm bandpass on each emission line aggressively rejects light pollution, moonlight, and atmospheric airglow. This dramatically increases the contrast between your target nebula and the sky background, allowing you to capture faint, detailed structures even from suburban locations.\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\u003eFilter E1 (Hα+OIII): Capturing a 3nm Signal from Hydrogen and Oxygen\u003c\/h3\u003e\n\u003cp\u003eThe E1 filter is the primary data-gathering tool in the set, capturing simultaneous 3nm signals from the two most dominant emission lines in most nebulae: Hydrogen-alpha (Hα) and Oxygen-III (OIII). When used with an OSC camera, Hα data is recorded by the red pixels, while OIII is recorded by the green and blue pixels.\u003c\/p\u003e\n\u003cp\u003eThis filter can be used on its own for high-contrast, bi-color images of targets like the Veil Nebula or the North American Nebula (NGC 7000). The \"Ultra E\" engineering specifically targets and suppresses halos around bright stars, ensuring clean data without distracting artifacts.\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\u003eFilter E2 (SII+OIII): Adding a 3nm Sulfur Channel for Structure\u003c\/h3\u003e\n\u003cp\u003eThe E2 filter completes the trio by isolating the Sulfur-II (SII) and Oxygen-III (OIII) lines within a 3nm bandpass. The SII signal, recorded by your camera's red pixels, often reveals different structures in nebulae compared to H-alpha, adding depth and detail to the final composite image.\u003c\/p\u003e\n\u003cp\u003eBy capturing OIII data again with this filter, you increase the total signal-to-noise ratio on the faintest OIII regions. In processing, you combine the data from both filters, using the red channel from the E1 exposure for Hα, the red channel from the E2 for SII, and the combined blue\/green channels from both exposures for OIII.\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\u003eColour Magic vs. Mono SHO: A Streamlined Two-Filter Workflow\u003c\/h3\u003e\n\u003cp\u003eThis two-filter system presents a powerful alternative to a traditional monochrome imaging setup for creating Hubble Palette images. It eliminates the need for a filter wheel and the complexity of managing three separate single-bandpass filters.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvantage Askar:\u003c\/strong\u003e You can capture all the necessary data in just two imaging sessions instead of three, saving valuable clear-sky time. The workflow is simpler, requiring less equipment and fewer steps to achieve a full SHO color image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvantage Monochrome:\u003c\/strong\u003e A dedicated monochrome camera with separate R, G, B, and narrowband filters will still offer the highest possible resolution, as it avoids the color interpolation of an OSC sensor's Bayer matrix. However, this comes at a significantly higher cost and complexity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor the OSC imager who wants to create dynamic, detailed SHO images without investing in a completely new camera and filter system, the Askar 3nm Colour Magic package is the most direct path.\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 Askar 3nm Colour Magic filter set work with a color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar Colour Magic set uses two filters to isolate the three main narrowband emission lines. First, you image with the \u003cstrong\u003eE1 (Hα+OIII) filter\u003c\/strong\u003e, which puts H-alpha light on your camera's red pixels and O-III light on the blue and green. Then, you switch to the \u003cstrong\u003eE2 (SII+OIII) filter\u003c\/strong\u003e, which puts Sulfur-II light on the red pixels and more O-III on the blue and green. In processing software, you can then separate these channels to create a full SHO (Hubble Palette) image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of splitting SII and Hα into two separate Askar filters (E1 and E2)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy placing H-alpha and Sulfur-II on separate filters, the Askar Colour Magic system allows you to isolate them cleanly using only the red pixels of your color camera. Standard \"tri-band\" or \"quad-band\" filters often capture both Hα and SII signals on the red pixels simultaneously, making it impossible to separate them for SHO color mapping. This two-filter approach is the key to achieving true Hubble Palette images with an OSC camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat processing is required to create a Hubble Palette image of the Eagle Nebula (M16) with the Askar Colour Magic filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAfter capturing data with both the E1 and E2 filters, you would use a program like PixInsight or Siril. The basic steps are:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSplit Channels:\u003c\/strong\u003e Separate the RGB channels from both your E1 master file and your E2 master file.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssign Channels:\u003c\/strong\u003e The Red channel from your E2 image becomes your \u003cstrong\u003eSulfur (S)\u003c\/strong\u003e. The Red channel from your E1 image becomes your \u003cstrong\u003eHydrogen (H)\u003c\/strong\u003e. The Blue and Green channels from both images are combined to create your \u003cstrong\u003eOxygen (O)\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombine:\u003c\/strong\u003e Use a channel combination tool to map S, H, and O to the Red, Green, and Blue channels of a new color image, respectively.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar Colour Magic set better than a single duo-band filter like an L-eXtreme?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThey serve different purposes. A standard duo-band filter is excellent for creating dramatic bi-color (red and teal) images with a single filter. The \u003cstrong\u003eAskar 3nm Colour Magic set\u003c\/strong\u003e is specifically designed for tri-color Hubble Palette (SHO) imaging. If your goal is to create images with the distinctive gold-and-blue look of the Hubble Space Telescope, the Colour Magic set is the superior choice as it allows you to isolate the critical SII signal that duo-band filters cannot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar Colour Magic E1 (Hα+OIII) filter by itself for imaging the Cygnus Loop?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The E1 filter functions as a high-performance 3nm duo-narrowband filter on its own. It is perfect for capturing high-contrast images of targets rich in Hydrogen and Oxygen, such as the Cygnus Loop (Veil Nebula), the Crescent Nebula (NGC 6888), or the North American Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the limitations of the Askar Colour Magic system compared to a monochrome camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary limitation is resolution. A one-shot-color camera uses a Bayer matrix, meaning only one-quarter of its pixels are sensitive to red light. Since both Hα and SII signals are captured by these red pixels (in separate exposures), the effective resolution for those channels is lower than what a monochrome camera, where every pixel is used for every filter, can achieve. However, for many imagers, the convenience and reduced cost of the Colour Magic system outweigh this difference.\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\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\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\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":50344447410461,"sku":"ASK-CM-E1E2","price":1678.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Colour-Magic-E1-E2-Filter-Package.jpg?v=1757644982"},{"product_id":"optolong-l-synergy-7nm-sii-oiii-dual-narrowband-filter","title":"Optolong L-Synergy 7nm SII\/OIII Dual Narrowband Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCaptures Sulfur-II and Oxygen-III Emission Lines Simultaneously\u003c\/li\u003e\n\u003cli\u003eEngineered for Hubble Palette (SHO) Imaging with Color Cameras\u003c\/li\u003e\n\u003cli\u003eStrict 7nm Bandpass for High-Contrast Views in Light Pollution\u003c\/li\u003e\n\u003cli\u003eDesigned to Complement Standard Ha\/OIII Dual-Band Filters\u003c\/li\u003e\n\u003cli\u003eIon-Assisted Coatings for Durability and Wavelength Stability\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-Synergy 7nm SII\/OIII Dual Narrowband Filter\u003c\/h2\u003e\n\u003cp\u003eThe Optolong L-Synergy 7nm SII\/OIII Dual Narrowband Filter is a specialized tool designed to unlock Hubble Palette (SHO) astrophotography for color camera users. By isolating the Sulfur-II and Oxygen-III emission lines within a tight 7nm bandpass, this filter captures the two signals that standard dual-band filters miss. When combined with data from a traditional Ha\/OIII filter, the L-Synergy enables you to produce full three-channel narrowband images without investing in a monochrome camera and filter wheel.\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 L-Synergy Concept: SHO Imaging with a 7nm Color Camera Filter\u003c\/h3\u003e\n\u003cp\u003eTraditional SHO imaging requires a monochrome camera and three separate filters for Hydrogen-alpha, Sulfur-II, and Oxygen-III. The L-Synergy filter provides a more accessible path by targeting the missing data for a one-shot-color sensor. Paired with an existing Ha\/OIII filter, this 7nm SII\/OIII filter completes the dataset, allowing you to separate and process all three signals to create vibrant Hubble Palette composites.\u003c\/p\u003e\n\u003cp\u003eThis dual-filter strategy dramatically simplifies both the hardware required and the post-processing workflow. By capturing strong, distinct signal for both SII and OIII, the raw data is cleaner and requires less aggressive stretching or gradient removal, leading to a more natural final image with minimal effort.\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\u003eIsolating Sulfur and Oxygen: A 7nm Bandpass for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eThe filter's strict 7nm bandpass is the key to its high-contrast imaging. This narrow window transmits nearly all light from the targeted SII and OIII emission lines while aggressively blocking out light pollution, moonlight, and airglow. This selective transmission results in a significantly darker sky background, making faint nebular structures stand out with enhanced detail and signal-to-noise ratio, even from urban or suburban locations.\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 Deposition Coatings for Wavelength Stability\u003c\/h3\u003e\n\u003cp\u003eOptolong utilizes an advanced ion-assisted deposition coating process to manufacture the L-Synergy filter. This technique produces a hard, scratch-resistant surface and ensures the central wavelength of the filter does not shift due to temperature changes during an imaging session. This stability guarantees that your filter consistently captures the intended emission lines, preventing signal loss and maintaining color fidelity throughout the night.\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-Synergy Method vs. Traditional Monochrome SHO Imaging\u003c\/h3\u003e\n\u003cp\u003eChoosing an imaging strategy involves trade-offs between cost, complexity, and ultimate signal purity. The L-Synergy method offers a compelling alternative to a full monochrome setup.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMonochrome SHO Advantage:\u003c\/strong\u003e A monochrome camera with dedicated filters offers the highest possible resolution and signal sensitivity, as it avoids the light loss inherent in a color camera's Bayer matrix. It remains the gold standard for scientific-grade data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL-Synergy Advantage:\u003c\/strong\u003e This method delivers results that are comparable to monochrome for a fraction of the cost and complexity. It allows you to use your existing DSLR or color CMOS camera, avoiding the need for a new camera, electronic filter wheel, and a full set of narrowband filters.\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 Optolong L-Synergy filter create Hubble Palette images with a color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe L-Synergy filter captures the \u003cstrong\u003eSulfur-II (SII) and Oxygen-III (OIII)\u003c\/strong\u003e signals. You use it in conjunction with a separate Ha\/OIII filter. By combining the data from both filters, you can isolate the Ha, SII, and OIII channels in post-processing and assign them to the Red, Green, and Blue channels of a final image to create the classic SHO Hubble Palette.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat other filter do I need to use with the Optolong L-Synergy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo capture a complete SHO dataset, you need to pair the L-Synergy (SII\/OIII) filter with a standard dual-band filter that captures \u003cstrong\u003eHydrogen-alpha (Ha) and Oxygen-III (OIII)\u003c\/strong\u003e, such as the Optolong L-eNhance or L-eXtreme.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Optolong L-Synergy 7nm filter work well with my fast telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter is optimized for telescope systems with focal ratios of \u003cstrong\u003ef\/3.3 and slower\u003c\/strong\u003e. Using it with faster optical systems (e.g., f\/2) may cause a shift in the filter's bandpass, leading to reduced signal transmission and a potential loss of performance. For the best results, it should be used within its recommended focal ratio range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Optolong L-Synergy filter improve imaging from a light-polluted city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter's tight \u003cstrong\u003e7nm bandpass\u003c\/strong\u003e blocks out the broad-spectrum light common to urban light pollution (like sodium and mercury vapor lamps) and natural skyglow. It only allows the specific light from emission nebulae to pass through, dramatically increasing contrast and revealing faint details that would otherwise be washed out.\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-Synergy to image the Wolf-Rayet nebula WR134?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. WR134 in Cygnus is an excellent target for the L-Synergy filter because its expanding shell is extremely rich in Oxygen-III, with some Sulfur-II signal as well. This filter is ideal for capturing the intricate blue-green arc of OIII that defines this object, which is often faint with other filter types.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Optolong L-Synergy perform on the Heart Nebula (IC 1805)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Heart Nebula is another prime target. While known for its strong Hydrogen-alpha signal (which you'd capture with an Ha\/OIII filter), it also contains significant regions of Sulfur-II and Oxygen-III. The L-Synergy filter will capture the data needed to add the golden hues of SII and the teal tones of OIII, transforming the typically red nebula into a full, multi-colored Hubble Palette image.\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":50399317033245,"sku":"OPT-LSYNERGY","price":432.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L-Synergy-Filter-1.jpg?v=1758936099"},{"product_id":"optolong-l-extreme-l-synergy-l2-dual-combo-filter-set-2","title":"Optolong L-Extreme + L-Synergy L2 Dual-Combo Filter Set - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIncludes L-eXtreme (H-alpha + OIII) and L-Synergy (SII + OIII) filters\u003c\/li\u003e\n\u003cli\u003eEnables Hubble Palette (SHO) imaging with one-shot color cameras\u003c\/li\u003e\n\u003cli\u003eCaptures three key nebula emission bands across two filters\u003c\/li\u003e\n\u003cli\u003eDesigned for modern, fast focal ratio telescope systems\u003c\/li\u003e\n\u003cli\u003eAdvanced ion-assisted coatings suppress halos and light pollution\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-Extreme + L-Synergy L2 Dual-Combo Filter Set - 2\"\u003c\/h2\u003e\n      \u003cp\u003eThe Optolong L-Extreme + L-Synergy L2 Dual-Combo Filter Set is engineered to bring Hubble Palette imaging to one-shot color cameras, eliminating the need for a monochrome setup. This set combines the L-eXtreme (H-alpha and OIII) and L-Synergy (SII and OIII) dual-narrowband filters to isolate the three most important emission lines in deep-sky astrophotography. By capturing this data over two imaging sessions instead of one, you can create full SHO composite images with the operational simplicity of your existing color camera.\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\u003eUnlocking the Hubble Palette for Color Cameras with the Optolong L2 Set\u003c\/h3\u003e\n      \u003cp\u003eHistorically, creating SHO \"Hubble Palette\" images required a monochrome camera, a filter wheel, and three separate narrowband filters—a costly and complex setup. The Optolong L2 Dual-Combo set breaks this barrier by intelligently pairing two dual-bandpass filters, allowing your color camera to collect all the necessary data to assemble a full SHO image, from the hydrogen greens of the North American Nebula (NGC 7000) to the sulfur reds of the Pelican Nebula (IC 5070).\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\u003eThe L-eXtreme Filter: Capturing Ha and OIII in a Single Frame\u003c\/h3\u003e\n      \u003cp\u003eThe first filter in the set is the renowned L-eXtreme, which isolates the Hydrogen-alpha and Oxygen-III emission lines. These two signals represent the most dominant wavelengths in most emission nebulae. The filter transmits these specific bands while aggressively blocking light pollution and other unwanted signals, ensuring maximum contrast and signal-to-noise ratio for the H-alpha and OIII data channels in your final image.\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\u003eThe L-Synergy Filter: Adding the Critical SII Signal for SHO\u003c\/h3\u003e\n      \u003cp\u003eThe L-Synergy filter completes the trio by isolating the Sulfur-II and Oxygen-III emission lines. While you capture OIII data with both filters, the L-Synergy's primary role is to gather the crucial SII signal, which forms the red channel in a traditional Hubble Palette. This filter provides the final piece of the puzzle, enabling a three-channel color mapping (SII=Red, Ha=Green, OIII=Blue) from data captured with just two filters.\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\u003eOptolong L2 Dual-Combo vs. Monochrome SHO: A Simpler Workflow\u003c\/h3\u003e\n      \u003cp\u003eFor imagers who want SHO results without the expense and learning curve of a monochrome system, the L2 Dual-Combo set is the direct solution. A monochrome setup's advantage is its ultimate control over data, but it requires more accessories, longer total integration times, and complex processing. The L2 set preserves the simplicity of color imaging—fewer cables, no filter wheel, and a more streamlined workflow—while delivering access to the same creative color palette previously reserved for mono users.\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\u003eAdvanced Coatings for High-Contrast, Halo-Free Results\u003c\/h3\u003e\n      \u003cp\u003eBoth filters in the L2 set are manufactured using an ion-assisted deposition coating process. This technology ensures the filter coatings are physically durable, resistant to scratching, and stable against temperature shifts that can cause other filters to drift off-wavelength. The result is precise, consistent bandpass performance and excellent suppression of halos around bright stars, yielding clean, high-contrast data ready for processing.\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 L2 Dual-Combo Set create a Hubble Palette image with a color camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe set allows you to capture all three essential narrowband channels (H-alpha, OIII, and SII) using a one-shot color camera. You use the \u003cstrong\u003eL-eXtreme filter\u003c\/strong\u003e to capture Ha and OIII data, then the \u003cstrong\u003eL-Synergy filter\u003c\/strong\u003e to capture SII and OIII data. In processing, you separate the color channels from both data sets to isolate the individual signals and then combine them into an SHO (SII=Red, Ha=Green, OIII=Blue) image.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the imaging process for the L2 Dual-Combo filters with my 8\" f\/4 Newtonian?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe process involves two separate imaging sessions on the same target. First, install the L-eXtreme filter and capture a series of sub-exposures. On a subsequent night (or after the first session), swap to the L-Synergy filter and capture another series of subs with similar total integration time. Because the set is designed for fast optical systems like your f\/4 Newtonian, you can gather significant signal efficiently.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Optolong L2 filters work well with my fast refractor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this filter set is specifically designed to perform well with fast telescope systems. The coatings and bandpass characteristics are engineered to maintain signal integrity and minimize artifacts even at steep light cones, making them an excellent match for modern fast refractors and astrographs.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Optolong L2 set over using a monochrome camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary advantage is \u003cstrong\u003ecost and simplicity\u003c\/strong\u003e. The L2 Dual-Combo set allows you to achieve SHO imaging without purchasing a separate monochrome camera, an electronic filter wheel, and a full set of LRGB and SHO filters. It leverages the color camera you already own, resulting in a much lower barrier to entry for creating Hubble Palette images.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I combine the data from the L-eXtreme and L-Synergy filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAfter calibrating and stacking your images from each filter separately, you will have two master files. Using software like PixInsight or Siril, you can split the RGB channels of each master. The red channel from the L-eXtreme data becomes your H-alpha. The red channel from the L-Synergy data becomes your SII. The blue\/green channels from either can be used for your OIII, often by combining them for better signal. You then assign these three extracted grayscale images to the R, G, and B channels of a new color image.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDo these Optolong filters help reduce halos around bright stars?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. Both the L-eXtreme and L-Synergy filters are manufactured with advanced coating techniques that significantly suppress internal reflections. This technology is optimized to minimize the bright, distracting halos that can appear around high-magnitude stars in long narrowband exposures.\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":50923140808989,"sku":"OPT-L2-COMBO","price":796.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Optolong-L2Dual-Combo-Filter-Set.jpg?v=1770476463"},{"product_id":"svbony-sv220-7nm-ha-oiii-dual-band-filter","title":"SVBONY SV220 7nm Ha\/OIII Dual-Band Filter","description":"","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52145332683037,"sku":"SV-W9172A","price":104.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52145332715805,"sku":"SV-W9172b","price":170.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV220-7nm-Ha-OIII-Dual-Band-Filter.png?v=1784391995"},{"product_id":"svbony-sv220-3nm-h-alpha-and-oiii-dual-narrowband-filter","title":"SVBONY SV220 3nm H-Alpha \u0026 OIII Dual Narrowband Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e3nm Dual-Bandpass:\u003c\/strong\u003e Isolates H-Alpha (656.3 nm) and OIII (500.7 nm) emission lines with extreme prejudice against light pollution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e≥85% Peak Transmittance:\u003c\/strong\u003e Captures maximum signal from faint nebulae by allowing more than 85% of target light to reach the sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch Mounted Format:\u003c\/strong\u003e Standard Φ50.8mm cell with M48x0.75mm threads for compatibility with most filter wheels and camera nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm Clear Aperture:\u003c\/strong\u003e Provides an unvignetted field for full-frame sensors, ensuring even illumination from edge to edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD5 Blocking Depth:\u003c\/strong\u003e Suppresses unwanted wavelengths from 300nm to 1050nm with an optical density of 5, delivering a jet-black sky background.\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\u003eNarrowband Filter 3nm H-Alpha \u0026amp; OIII SV220 2inch\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV220 Narrowband Filter isolates the two most critical deep-sky emission lines with a tight 3nm bandpass centered at 656.3 nm for H-Alpha and 500.7 nm for OIII. This 2-inch filter achieves ≥85% peak transmittance for both wavelengths while its 44mm clear aperture eliminates vignetting on full-frame sensors. Mounted in a 7mm thick aluminum cell with standard M48x0.75mm threads, it delivers extreme contrast by blocking unwanted light with an average optical density of 5 across the 300-1050nm spectrum.\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-Band 3nm Optics: Isolate H-Alpha and OIII with 85% Transmission\u003c\/h3\u003e\n\u003cp\u003eThe core of the SV220 filter is its extremely narrow 3nm bandwidth. This design aggressively rejects light pollution, moonlight, and airglow, allowing only the specific light from ionized hydrogen (H-Alpha at 656.3 nm) and doubly ionized oxygen (OIII at 500.7 nm) to pass through. With an average peak transmittance of ≥85%, you capture maximum signal from emission nebulae, revealing faint, intricate structures that would otherwise be lost in 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\u003eFull-Frame Imaging: A 44mm Clear Aperture to Eliminate Vignetting\u003c\/h3\u003e\n\u003cp\u003eEngineered for modern large-format sensors, the SV220's 2-inch housing features a 44mm light transmission aperture. This generous clear aperture prevents the vignetting or dimming at the corners of the frame that can occur with smaller filters on full-frame cameras. The standard M48x0.75mm male thread ensures broad compatibility with dedicated astronomy cameras, filter wheels, and telescope focusers, providing a secure, tilt-free connection.\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\u003eOD5 Blocking and λ\/4 Flatness: Suppressing Halos and Preserving Star Shape\u003c\/h3\u003e\n\u003cp\u003eBeyond the narrow bandpass, the SV220 uses a substrate with a transmitted wavefront of λ\/4 or better and parallelism of 30 arcseconds, ensuring that stars remain sharp and round. Multi-layer anti-reflection and anti-halo coatings, combined with an average OD5 blocking depth from 300nm to 1050nm, virtually eliminate halos around bright stars and produce a clean, high-contrast background. The filter is constructed from a 2.0mm thick substrate housed in a lightweight 12.5g 6061T aluminum cell for durability.\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\u003eSV220 Dual-Band vs. Mono Filters: Streamlining Your Imaging Sessions\u003c\/h3\u003e\n\u003cp\u003eFor one-shot-color (OSC) camera users, a dual-band filter like the SV220 offers a significant workflow advantage over a monochrome camera with a filter wheel and separate H-alpha and OIII filters. While a mono setup provides the ultimate in data control, the SV220 allows you to capture both critical emission lines simultaneously, cutting your total imaging time in half without swapping filters. This is especially valuable on nights with limited clear skies or when imaging targets that are only visible for a few hours.\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 SVBONY SV220's 3nm dual-band design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is \u003cstrong\u003eextreme contrast and efficiency\u003c\/strong\u003e. The ultra-narrow 3nm bandwidth isolates the key H-Alpha (656.3 nm) and OIII (500.7 nm) wavelengths, aggressively blocking light pollution. By capturing both bands at once, it dramatically reduces the imaging time required compared to using separate monochrome filters, making it ideal for OSC camera users.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV220 2-inch filter work with my full-frame camera and filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SVBONY SV220 is designed specifically for this application. It uses a standard 2-inch mounted cell (Φ50.8mm) with M48x0.75mm threads, which is the standard for most 2-inch filter wheels and camera nosepieces. Its 44mm clear aperture is large enough to fully illuminate full-frame sensors without causing vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV220 3nm filter perform on the Orion Nebula (M42) from a light-polluted suburb?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV220 is ideal for this scenario. The Orion Nebula (M42) is rich in both H-Alpha and OIII emission. The filter's 3nm bandpass will reject nearly all city light, revealing the faint, extended nebulosity of the outer loops and the intricate detail within the Trapezium region that is normally washed out by skyglow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV220 filter with my fast f\/4 Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can, be aware of a potential trade-off. Very narrow filters like this 3nm model can experience a slight \"band-shift\" with very fast optical systems (typically f\/4 and below). This means the filter's center wavelength can shift slightly, potentially reducing transmission. For optimal results with this filter, systems of f\/4.5 or slower are recommended, but it can still yield excellent results at f\/4, especially on bright targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the OD5 blocking depth on the SV220 filter mean for my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eOD5 means Optical Density 5\u003c\/strong\u003e, which is a measure of how well the filter blocks unwanted light. It signifies that the filter allows only 1\/100,000th of the light outside its bandpass to get through. This deep blocking across the 300-1050nm range is critical for creating a dark, high-contrast background and preventing sensor bloat from bright stars and near-infrared light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV220 H-Alpha \u0026amp; OIII filter suitable for imaging galaxies like Andromeda (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGenerally, no. Galaxies like the Andromeda Galaxy (M31) are broadband targets, meaning their light comes from stars emitting across the entire visible spectrum. A narrowband filter like the SV220 will block almost all of this light. It is specifically designed for \u003cstrong\u003eemission nebulae\u003c\/strong\u003e, such as the North America Nebula (NGC 7000) or the Veil Nebula (NGC 6960), which glow brightly at the H-Alpha and OIII wavelengths.\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\u003eProduct Size\u003c\/td\u003e\n\u003ctd\u003e2 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Dimensions\u003c\/td\u003e\n\u003ctd\u003eΦ50.8 × 7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eM48 × 0.75 mm (Male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth (FWHM)\u003c\/td\u003e\n\u003ctd\u003eH-alpha: 3±1 nm, OIII: 3±1 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter Wavelengths\u003c\/td\u003e\n\u003ctd\u003eH-alpha: 656.3 nm, OIII: 500.7 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e≥85% Average\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e300–1050 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003eAverage OD5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Flatness\u003c\/td\u003e\n\u003ctd\u003e≤ λ\/4 Transmitted Wavefront\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30″\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\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e2.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e6061T Aluminum Extrusion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e12.5g\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\"\u003eSV220 H-Alpha \u0026amp; OIII Dual Narrowband Filter (3nm \/ 2-inch)\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 Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861233234205,"sku":"SV-W9198A","price":168.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861233266973,"sku":"SV-W9198B","price":350.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-Narrowband-Filter-3nm-H-Alpha-OIII-SV220-2inch-1_470fd306-4266-4f42-977d-da10a2a07ca4.jpg?v=1788659986"},{"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":"player-one-anti-halo-pro-dual-band-2-inch-ha-oiii-filter","title":"Player One Anti-Halo PRO Dual-Band Ha\/OIII Filter - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced Halo Suppression:\u003c\/strong\u003e Specifically engineered to eliminate halos around even the brightest stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Band Ha+OIII Design:\u003c\/strong\u003e Captures hydrogen-alpha and oxygen-III emission lines simultaneously, ideal for one-shot color cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch Mounted Format:\u003c\/strong\u003e Standard size for use in 2\" focusers, filter wheels, and filter drawers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProven on Fast Optics:\u003c\/strong\u003e Performance validated on an f\/4 Newtonian reflector, ensuring compatibility with demanding, fast-ratio systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\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\u003eAnti-Halo PRO Dual-Band 2″ Ha+OIII filter\u003c\/h2\u003e\n      \u003cp\u003eThe Anti-Halo PRO Dual-Band 2″ Ha+OIII filter is engineered to solve the single most persistent artifact in modern narrowband astrophotography: distracting halos around bright stars. Its effectiveness was proven in a demanding test on Vega, a magnitude 0 star, where a 120-second exposure with an 8\" f\/4 Newtonian produced a clean, halo-free stellar profile.\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\u003eTested on Vega: Zero Halos on a Magnitude 0 Star\u003c\/h3\u003e\n      \u003cp\u003eMany filters fail when imaging targets near bright stars. The Anti-Halo PRO was subjected to a worst-case scenario: a 120-second exposure of Vega, one of the brightest stars in the night sky, using a fast 8\" f\/4 Newtonian telescope. The result is a complete absence of the characteristic halo that plagues other narrowband and dual-band designs, proving its ability to maintain image integrity under the most challenging conditions.\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\u003eDual-Band Capture for Light-Polluted Skies\u003c\/h3\u003e\n      \u003cp\u003eDesigned for one-shot color cameras (DSLR, Mirrorless, and dedicated OSC astro cameras), this filter isolates the two most prominent emission nebula wavelengths—Hydrogen-alpha and Oxygen-III. This allows you to capture high-contrast nebula data from suburban skies in a single set of exposures, dramatically simplifying your imaging workflow and processing time compared to monochrome filter sets.\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\u003eAnti-Halo PRO vs. Conventional Filters: A Critical Difference\u003c\/h3\u003e\n      \u003cp\u003eWhile many filter manufacturers focus exclusively on achieving narrower bandpasses, this often comes at the cost of increased internal reflections, resulting in prominent halos. The Anti-Halo PRO prioritizes clean optical performance across the entire frame. It delivers the high-contrast, light-pollution-blocking benefits of a dual-band filter without forcing you to compromise on star quality, making it the superior choice for images containing bright, high-magnitude stars.\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\"\u003eWhat makes the Anti-Halo PRO Dual-Band filter different from other Ha+OIII filters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIts primary design goal is \u003cstrong\u003ehalo suppression\u003c\/strong\u003e. While other filters focus solely on narrow bandpass, they can introduce severe halos around bright stars. The Anti-Halo PRO uses advanced coating techniques to eliminate these artifacts, ensuring clean stars even in fields with high-magnitude objects.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Anti-Halo PRO filter suitable for my DSLR or one-shot color camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it is ideal for these cameras. The filter was tested using a Canon 700D DSLR. It passes both the red H-alpha and blue-green OIII wavelengths, allowing a standard color sensor to capture detailed nebula data in a single shot from light-polluted locations.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Anti-Halo PRO filter perform on a target like the Orion Nebula (M42)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis is an excellent use case. The Anti-Halo PRO filter will allow you to capture the faint outer nebulosity of M42 while keeping the bright stars of the Trapezium cluster sharp and free of distracting halos. This preserves the high dynamic range of the target without introducing artifacts.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the ideal focal ratio for the Anti-Halo PRO filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe filter has been proven to work exceptionally well on \u003cstrong\u003efast f\/4 systems\u003c\/strong\u003e, which are often the most challenging for filters due to the steep light cone angles. This indicates it will perform robustly on a wide range of telescope focal ratios, from fast Newtonians to slower refractors and SCTs.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIf I image the Veil Nebula (NGC 6960) near the star 52 Cygni, will this filter prevent halos?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is exactly the type of scenario the Anti-Halo PRO is designed for. It will suppress the halo from the bright star 52 Cygni, allowing the delicate, filamentary structure of the Witch's Broom Nebula to be captured cleanly without being overwhelmed by filter-induced artifacts.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Anti-Halo PRO filter for visual observing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this is an imaging-only filter. Narrowband and dual-band filters have very restrictive bandpasses that are too dim for the human eye. They are designed for long-exposure astrophotography with a camera.\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\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\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\"\u003eAnti-Halo PRO Dual-Band 2\" 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\u003cp\u003e\u003ca title=\"Player One 2-Year Warranty\" href=\"https:\/\/davidastro.com\/pages\/player-one-warranty-policy\" target=\"_blank\"\u003ePlayer One 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":52913424597277,"sku":"POA-AHP-HO-2","price":699.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/PlayerOne-Anti-Halo-PRO-Dual-Band-2-Ha-OIII-filter-1_f6d48492-c19e-4962-b802-6c731d4e7240.jpg?v=1789090877"}],"url":"https:\/\/davidastro.com\/fr-us\/collections\/dual-band-filters.oembed?page=2","provider":"David Astro","version":"1.0","type":"link"}