{"title":"Aplanisseurs de champ, réducteurs de focale et correcteurs de coma Askar","description":"\u003cp\u003eLes aplanisseurs de champ et réducteurs de focale Askar sont conçus pour des lunettes Askar précises, afin d'aplanir le champ ou de raccourcir la focale en imagerie. La gamme comprend des aplanisseurs 1x et des réducteurs 0.8x pour les 103APO, 120APO, 140APO, 160APO et 185APO, des réducteurs pour les gammes PHQ, F et FRA, et un réducteur 0.85x pour la 80ED.\u003c\/p\u003e\u003cp\u003eLe Sharpstar 3\" 0.85x MPCC (CRC3085) ajoute un correcteur de coma avec une légère réduction. Choisissez le modèle nommé pour votre tube.\u003c\/p\u003e","products":[{"product_id":"askar-2-5-f-3-9-full-frame-reducer-for-fra400-and-fra500","title":"Réducteur plein format Askar 2,5\" F\/3,9 pour FRA400 et FRA500","description":"\u003cul\u003e\n\n\u003cli\u003e\n\n Réducteur de focale de 2,5\" conçu pour les télescopes Askar FRA400 et FRA500\n\n\u003c\/li\u003e\n\n\u003cli\u003e \nRéduit le rapport focal à f\/3,9, optimisé pour les capteurs plein format \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 réducteur plein format Askar 2,5\" F\/3,9 est un accessoire optique spécialisé conçu pour améliorer les capacités d'imagerie des télescopes Askar FRA400 et FRA500. Ce réducteur focal diminue le rapport focal du télescope à f\/3,9, permettant des expositions plus rapides et un champ plus large. de vue tout en conservant une excellente qualité d’image sur les capteurs plein format. \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 Spécialement conçu pour être utilisé avec les télescopes Askar FRA400 et FRA500. Assurez-vous de la compatibilité avec la taille du capteur de votre appareil photo avant l'achat.\n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv\u003e\n\n\u003ch3\u003e\n\n Performances optiques \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 réducteur plein format 2,5\" F\/3,9 est doté d'optiques de haute qualité conçues pour maintenir des images nettes et bien corrigées sur tout le champ de vision, même avec des capteurs plein format. Il réduit efficacement la distance focale des télescopes FRA400 et FRA500 tout en minimisant les aberrations optiques, garantissant une excellente qualité d'image pour l'astrophotographie. \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=\"Askar2.5\" f full frame reducer for fra400 and fra500 src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/Askar-FRA400FR-1__39150.1610302783.1280.1280_1028x1028.jpg?v=1684345839\" 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 \nCapacités d'imagerie améliorées \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=\"Askar2.5\" f full frame reducer for fra400 and fra500 src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/Askar-FRA400FR-1__39150.1610302783.1280.1280_1028x1028.jpg?v=1684345839\" 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 réduisant le rapport focal à f\/3,9, ce réducteur permet des expositions nettement plus rapides, ce qui facilite la capture d'objets faibles du ciel profond. Le champ de vision plus large permet également d'imager des cibles célestes plus grandes, élargissant ainsi la gamme d'objets pouvant être photographiés avec les télescopes FRA400 et FRA500.\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 Optimisation plein format\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Spécialement conçu pour couvrir les capteurs plein format, ce réducteur garantit une netteté bord à bord et un vignettage minimal sur l'ensemble du champ de l'image. Cela en fait un choix idéal pour les astrophotographes utilisant des appareils photo reflex numériques plein format ou sans miroir, ainsi que des caméras CCD astronomiques grand format.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Qualité de construction\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e \nConstruit avec des matériaux de haute qualité et des optiques de précision, le réducteur est conçu pour résister aux rigueurs d'une utilisation fréquente et maintenir son alignement optique. La construction robuste garantit des performances constantes dans le temps, ce qui en fait un ajout fiable à votre kit d'astrophotographie.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Intégration facile\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Le format 2,5\" garantit une intégration facile avec les télescopes Askar FRA400 et FRA500 et une compatibilité avec les équipements d'astronomie standard. Le réducteur est conçu pour une installation et un retrait simples, permettant une utilisation flexible en fonction de vos besoins d'imagerie.\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 Bien qu'optimisé pour les capteurs plein format, ce réducteur peut également être utilisé avec des capteurs de plus petite taille, offrant des champs de vision encore plus larges. Cette polyvalence le rend adapté à une gamme de projets d'astrophotographie, depuis les prises de vue à grand champ de la Voie lactée jusqu'aux images détaillées de grandes nébuleuses et galaxies.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Spécifications techniques\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n - Facteur de réduction : Réduit le rapport focal à f\/3,9\n - Diamètre : 2,5 pouces (63,5 mm) \n- Optimisé pour : Capteurs plein format\n - Compatible avec : Télescopes Askar FRA400 et FRA500\n - Backfocus : reportez-vous aux spécifications du fabricant pour un espacement optimal des caméras\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":44967778976029,"sku":"ASK-ASKAR7256RD","price":384.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA400FR-1__39150.1610302783.1280.1280.jpg?v=1684345839"},{"product_id":"askar-3-f-3-9-full-frame-reducer-for-fra600","title":"Réducteur plein cadre Askar 3\" F\/3.9 pour FRA600","description":"\u003cul\u003e\n\n\u003cli\u003e\n\nRéducteur de focale 3\" conçu spécifiquement pour le télescope Askar FRA600\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Réduit le rapport focal à f\/3,9, optimisé pour les capteurs plein format \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 réducteur plein format Askar 3\" F\/3.9 est un accessoire optique spécialisé conçu pour améliorer les capacités d'imagerie du télescope Askar FRA600. Ce réducteur focal diminue le rapport focal du télescope à f\/3,9, permettant des expositions plus rapides et un champ de vision plus large. tout en conservant une excellente qualité d’image sur les capteurs plein format. \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 Spécialement conçu pour être utilisé avec le télescope Askar FRA600. Assurez-vous de la compatibilité avec la taille du capteur de votre appareil photo avant l'achat.\n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv\u003e\n\n\u003ch3\u003e\n\n Performances optiques \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 réducteur plein format 3\" F\/3.9 est doté d'optiques de haute qualité conçues pour maintenir des images nettes et bien corrigées sur tout le champ de vision, même avec des capteurs plein format. Il réduit efficacement la distance focale du télescope FRA600 tout en minimisant les optiques. aberrations, garantissant une excellente qualité d’image pour l’astrophotographie. \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=\"Askar 3\" f full frame reducer for fra600 src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/Askar-FRA600FR-1__09035.1610302990.1280.1280_1028x1028.jpg?v=1684345841\" 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 Capacités d'imagerie améliorées \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=\"Askar 3\" f full frame reducer for fra600 src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/Askar-FRA600FR-1__09035.1610302990.1280.1280_1028x1028.jpg?v=1684345841\" 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 réduisant le rapport focal à f\/3,9, ce réducteur permet des expositions nettement plus rapides, ce qui facilite la capture d'objets faibles du ciel profond. Le champ de vision plus large permet également d'imager des cibles célestes plus grandes, élargissant ainsi la gamme d'objets pouvant être photographiés avec le télescope FRA600.\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 Optimisation plein format\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e \nSpécialement conçu pour couvrir les capteurs plein format, ce réducteur garantit une netteté bord à bord et un vignettage minimal sur l'ensemble du champ de l'image. Cela en fait un choix idéal pour les astrophotographes utilisant des appareils photo reflex numériques plein format ou sans miroir, ainsi que des caméras CCD astronomiques grand format.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Qualité de construction\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Construit avec des matériaux de haute qualité et des optiques de précision, le réducteur est conçu pour résister aux rigueurs d'une utilisation fréquente et maintenir son alignement optique. La construction robuste garantit des performances constantes dans le temps, ce qui en fait un ajout fiable à votre kit d'astrophotographie.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Intégration facile\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Le format 3\" garantit une intégration facile avec le télescope Askar FRA600 et une compatibilité avec les équipements d'astronomie standard. Le réducteur est conçu pour une installation et un retrait simples, permettant une utilisation flexible en fonction de vos besoins d'imagerie.\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 \nBien qu'optimisé pour les capteurs plein format, ce réducteur peut également être utilisé avec des capteurs de plus petite taille, offrant des champs de vision encore plus larges. Cette polyvalence le rend adapté à une gamme de projets d'astrophotographie, depuis les prises de vue à grand champ de la Voie lactée jusqu'aux images détaillées de grandes nébuleuses et galaxies.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Spécifications techniques\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n - Facteur de réduction : Réduit le rapport focal à f\/3,9\n - Diamètre : 3 pouces (76,2 mm)\n - Optimisé pour : Capteurs plein format\n - Compatible avec : Télescope Askar FRA600\n - Backfocus : reportez-vous aux spécifications du fabricant pour un espacement optimal des caméras\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":44967779008797,"sku":"ASK-ASKAR656RD","price":615.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA600FR-1__09035.1610302990.1280.1280.jpg?v=1684345841"},{"product_id":"askar-0-7x-universal-reducer-for-107phq-130phq-151phq","title":"Réducteur universel Askar 0,7x pour 107PHQ\/130PHQ\/151PHQ","description":"\u003cul\u003e\n\n\u003cli\u003e Optimisé pour l'Askar 107PHQ\/130PHQ\/151PHQ\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\u003cul class=\"tabs-content\"\u003e\n\n\u003cli class=\"active\" style=\"text-align: justify;\"\u003e\n\n\u003cp\u003e\n Le nouveau réducteur plein format 3\" 0,7x d'Askar est conçu pour les astrographes 107PHQ et 130PHQ. Doté d'une conception triple avec un élément en verre ED, ce réducteur diminue le rapport focal du 107PHQ à 4,9 et réduit sa distance focale à 524 mm.\u003c\/p\u003e\n\n\u003cp\u003e \nLorsqu'il est utilisé avec ces astrographes, le réducteur raccourcit les temps d'exposition et augmente considérablement le champ de vision, offrant ainsi une plus grande commodité et un plus grand potentiel pour l'astrophotographie du ciel profond. Il fournit une mise au point arrière standard de 55 mm et comprend trois adaptateurs filetés (M68, M54 et M48) pour une connexion facile.\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n\u003ch3\u003e Description \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 nouveau réducteur plein format 3\" 0,7x d'Askar s'adapte aux 107PHQ et 130PHQ. Il a une conception triple avec un verre ED. La réduction de 0,7x donne au 107PHQ un rapport focal raccourci de 4,9 et une distance focale raccourcie de 524 mm. Ce réducteur, connecté aux astrographes, peut réduire efficacement le temps d'exposition et augmenter considérablement votre champ de vision, apportant plus de commodité et de possibilités pour votre astrophotographie du ciel profond. Le backfocus est le 55 mm standard. Il est livré avec trois adaptateurs filetés M68, M54, M48, ce qui le rend pratique pour la connexion. \n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\n\u003cdiv style=\"text-align: start;\" class=\"image-side-2\" data-mce-style=\"text-align: start;\"\u003e\n\n\u003cimg alt=\"\" src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/Askar-PHQ-Reducer__94249.1657565838.1280.1280_600x600.jpg?v=1684348170\"\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\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968036466973,"sku":"ASK-ASF107130RE","price":538.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-PHQ-Reducer__94249.1657565838.1280.1280.jpg?v=1684348170"},{"product_id":"askar-0-76x-reducer-for-80phq","title":"Réducteur Askar 0.76x pour 80PHQ","description":"\u003cul\u003e\n\n\u003cli\u003e Optimisé pour l'Askar 80PHQ\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\u003cul class=\"tabs-content\"\u003e\n\n\u003cli class=\"active\" style=\"text-align: justify;\"\u003e\n\n\u003cp\u003e\n Le nouveau réducteur plein format Askar de 3 pouces 0,76x, conçu spécifiquement pour le 80PHQ, présente une conception triplet. Lorsqu'il est utilisé avec l'astrographe 80PHQ F\/7.5, il réduit le rapport focal à 5,7 et la distance focale à 456 mm.\n\u003c\/p\u003e\n\n\u003cp\u003e\n Cette réduction raccourcit efficacement les temps d'exposition et augmente considérablement le champ de vision, améliorant ainsi la commodité et le potentiel de l'astrophotographie du ciel profond.\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n\t\t\t \u003ch3\u003eDescription \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 nouveau réducteur plein format Askar de 3 pouces 0,76x, conçu spécifiquement pour le 80PHQ, présente une conception triplet. Lorsqu'il est utilisé avec l'astrographe 80PHQ F\/7.5, il réduit le rapport focal à 5,7 et la distance focale à 456 mm. Cette réduction raccourcit efficacement les temps d'exposition et augmente considérablement le champ de vision, améliorant ainsi la commodité et le potentiel de l'astrophotographie du ciel profond. \n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\n\u003cdiv style=\"text-align: start;\" class=\"image-side-2\" data-mce-style=\"text-align: start;\"\u003e\n\n\u003cimg alt=\"\" src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/Askar-80PHQ-Reducer__01912.1679584601.1280.1280_699x699.jpg?v=1684348743\"\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\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968076083485,"sku":"ASK-ASKAR80R","price":368.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-80PHQ-Reducer__01912.1679584601.1280.1280.jpg?v=1684348743"},{"product_id":"askar-1x-field-flattener-for-103apo","title":"Askar 1x aplatisseur de champ pour 103APO","description":"\u003cul\u003e\n\n\t \u003cli\u003eCorrige la courbure du champ et le coma\u003c\/li\u003e\n\n\u003cli\u003e Usiné CNC dans l'ensemble\u003c\/li\u003e\n\n\u003cli\u003e Le poids total est de 0,58 kg.\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\u003cul class=\"tabs-content\"\u003e\n\n\u003cli class=\"active\" style=\"text-align: justify;\"\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv class=\"two-columns-section\"\u003e\n\n\u003cdiv class=\"text-side-2\"\u003e\n\n\u003cp\u003e\n L'aplatisseur 1x ne modifie pas lui-même le rapport focal du télescope. Après connexion avec l'Askar 103APO, il conservait toujours une distance focale de 6,8. L'aplatisseur corrige la courbure et le coma du champ, ce qui donne des bords de champ plus plats et des points d'étoile plus fins.\n\u003c\/p\u003e\n\n\u003cp\u003e\n L'aplatisseur 1,0x adopte une conception triplet et prend en charge un cercle d'image plein format de 44 mm. Le poids total est de 0,58 kg. La mise au point arrière du filetage M48 est un 55 mm standard. Le filetage avant est M84*1.\n\u003c\/p\u003e\n\n\u003cp\u003e\n Côté caméra, il est équipé d'adaptateurs M54*0.75 et M48*0.75 de deux tailles, pratiques pour la connexion.\n\u003c\/p\u003e\n\n\u003cp\u003e\n En même temps, il dispose d'un filetage de filtre M48 * 0,75 2 pouces intégré, qui peut être directement installé et utilisé. Les capuchons métalliques filetés aux deux extrémités usinés CNC empêchent les cendres lorsqu'ils ne sont pas utilisés. \n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\n\u003cdiv style=\"text-align: start;\" class=\"image-side-2\" data-mce-style=\"text-align: start;\"\u003e\n\n\u003cimg alt=\"\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/Askar-103APO-Field-Flattener-ASKFL10310-1_884x884.png?v=1697487604\"\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\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":46861263405341,"sku":"ASK-ASKFL10310","price":307.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-103APO-Field-Flattener-ASKFL10310-1.png?v=1697487604"},{"product_id":"askar-0-8x-reducer-for-103apo","title":"Askar 0,8x Réducteur pour 103APO","description":"\u003cul\u003e\n\n\u003cli\u003e Optimisé pour l'Askar 103 APO\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\u003cul class=\"tabs-content\"\u003e\n\n\u003cli class=\"active\" style=\"text-align: justify;\"\u003e\n\n \u003cp\u003eL'Askar 103 APO propose trois accessoires premium en option : un aplatisseur 1,0x, un réducteur 0,8x et un réducteur 0,6x.\u003c\/p\u003e\n\n\u003cp\u003e Nous présentons ici le réducteur 0,8x, optimisé pour l'Askar 103 APO, qui étend les capacités du télescope.\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n\u003ch3\u003e Description \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 réducteur 0,8x ramène le rapport focal de l'Askar 103 APO à F5,4. Ce réducteur standard possède également des capacités d'aplatissement du champ. Le rapport focal plus court permet à l'OTA d'obtenir un champ de vision plus large et des temps d'exposition plus rapides, ce qui le rend idéal pour capturer de vastes zones de nébuleuses, d'amas d'étoiles et d'objets célestes faibles et se déplaçant rapidement.\u003c\/p\u003e\n\n\u003cbr\u003e\n\u003cp\u003e Doté d'une conception triplet, le réducteur 0,8x prend en charge un cercle d'image plein format de 44 mm et pèse 0,48 kg. Il offre une mise au point arrière standard de 55 mm à partir du filetage M48, avec un filetage avant M841. L'extrémité de la caméra est équipée de deux tailles d'adaptateur, M540.75 et M480.75, pour des connexions pratiques.\u003c\/p\u003e\n\n\u003cbr\u003e\n \u003cp\u003eDe plus, il comprend un filetage de filtre M480.75 de 2 pouces intégré pour une installation et une utilisation directes. L'ensemble de l'unité est usiné CNC, avec des capuchons métalliques filetés aux deux extrémités pour éviter l'accumulation de poussière lorsqu'il n'est pas utilisé. \u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\n\u003cdiv style=\"text-align: start;\" class=\"image-side-2\" data-mce-style=\"text-align: start;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/Askar-103APO-0-8x-Reducer-ASKRE10308-2_884x884.png?v=1697488015\"\u003e\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 class=\"specifications\"\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003eAprès fixation）103APO Distance focale\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e 560,32 mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003e(Après fixation)103APO Rapport focal\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e f\/5.44\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003eNuméro d'objectif\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e Conception triple\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003eMise au point arrière\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e 55 mm (à partir de la base du filetage mâle M48)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003ePoids\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e 0,48kg\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003eType de filetage arrière\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e M54 × 0,75\u003c\/li\u003e\n\n\u003cli\u003e M54 × 0,75-M48 × 0,75 (filetage du filtre M48 × 0,75 à l'intérieur) \u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":46861341458717,"sku":"ASK-ASKRE10308","price":307.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-103APO-0-8x-Reducer-ASKRE10308-1.png?v=1697488015"},{"product_id":"askar-0-6x-reducer-for-103apo","title":"Askar 0,6x Réducteur pour 103APO","description":"\u003cul\u003e\n\n\u003cli\u003e Optimisé pour l'Askar 103APO\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\u003cul class=\"tabs-content\"\u003e\n\n\u003cli class=\"active\" style=\"text-align: justify;\"\u003e\n\n\u003cp\u003e\n L'Askar 103 APO propose trois accessoires premium en option : un aplatisseur 1,0x, un réducteur 0,8x et un réducteur 0,6x.\n\u003c\/p\u003e\n\n\u003cp\u003e\n Nous présentons ici le réducteur 0,6x, optimisé pour l'Askar 103 APO, qui étend les capacités du télescope.\n\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n\u003ch3\u003e Description \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 réducteur 0,6x abaisse le rapport focal de l'Askar 103 APO à F4 tout en assurant également un aplatissement du champ. L'Askar 103 APO présente une conception de tube amovible, permettant de retirer la partie arrière du tube lors de l'utilisation du réducteur 0,6x, obtenant ainsi la longueur nécessaire pour un rapport focal F4.\n\u003c\/p\u003e\n\n\u003cp\u003e\n Le réducteur 0,6x a une conception quadruplet et prend en charge un cercle d'image plein format de 44 mm. Il pèse 0,98 kg et offre une mise au point arrière standard de 55 mm à partir du filetage M48. Le filetage avant est M841. L'extrémité de la caméra est équipée de trois tailles d'adaptateur (M681, M540.75 et M480.75) pour une connexion et une utilisation faciles.\n\u003c\/p\u003e\n\n\u003cp\u003e\n De plus, le filetage de filtre M48*0,75 2 pouces intégré permet une installation directe des filtres. L'unité est usinée CNC avec des capuchons métalliques filetés aux deux extrémités pour éviter l'accumulation de poussière lorsqu'elle n'est pas utilisée. \n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\n\u003cdiv style=\"text-align: start;\" class=\"image-side-2\" data-mce-style=\"text-align: start;\"\u003e\n\n\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/8ec090e3-cefa-4b95-ae0f-3e0c8045a83b.jpg?v=1722023146\"\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\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":46861375701277,"sku":"ASK-ASKRE10306","price":461.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-103APO-0-6x-Reducer-ASKRE10306-1.png?v=1697488274"},{"product_id":"askar-0-8x-reducer-for-140apo","title":"Askar 0,8x Réducteur pour 140APO","description":"\u003cul\u003e\n\n\u003cli\u003e Optimisé pour l'Askar 140 APO\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\u003cul class=\"tabs-content\"\u003e\n\n\u003cli class=\"active\" style=\"text-align: justify;\"\u003e\n\n\u003cp\u003e\n L'Askar 140 APO propose trois accessoires optionnels haut de gamme : un aplatisseur 1,0x et un réducteur 0,8x.\n\u003c\/p\u003e\n\n\u003cp\u003e\n Nous présentons ici le réducteur 0,8x, spécifiquement optimisé pour l'Askar 140 APO, qui étend les capacités du télescope.\n\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n\u003ch3\u003e Description \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 réducteur 0,8x réduit le rapport focal de l'Askar 140 APO à F5,6, fonctionnant comme un réducteur standard avec des capacités d'aplatissement du champ. Ce rapport focal plus court permet à l'OTA d'obtenir un champ de vision plus large et des temps d'exposition plus rapides, ce qui le rend idéal pour capturer de vastes zones de nébuleuses, d'amas d'étoiles et d'objets célestes faibles et se déplaçant rapidement.\n\u003c\/p\u003e\n\n\u003cbr\u003e\n\u003cp\u003e\n Doté d'une conception triplet, le réducteur 0,8x prend en charge un cercle d'image plein format de 44 mm et pèse 0,75 kg. Il fournit une mise au point arrière standard de 55 mm à partir du filetage M48, avec un filetage avant M92*1. L'extrémité de la caméra est équipée de deux tailles d'adaptateur, M54*0,75 et M48*0,75, pour des connexions pratiques.\n\u003c\/p\u003e\n\n\u003cbr\u003e\n\u003cp\u003e\n De plus, il comprend un filetage de filtre M48*0,75 2 pouces intégré pour une installation et une utilisation directes. L'ensemble de l'unité est usiné CNC, avec des capuchons métalliques filetés aux deux extrémités pour éviter l'accumulation de poussière lorsqu'il n'est pas utilisé. \n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\n\u003cdiv style=\"text-align: start;\" class=\"image-side-2\" data-mce-style=\"text-align: start;\"\u003e\n\n\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/7aa725af-9cf7-4e43-9110-3003e039fd08.jpg?v=1722020937\"\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\n\u003cli\u003e\n\n\u003ctable class=\"specifications\"\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003e(Après fixation) 140APO Distance focale\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e 784mm\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\t\t\t\t \u003ctd\u003e\u003cb\u003e(Après fixation)140APO Rapport focal\u003c\/b\u003e\u003c\/td\u003e\n\n\u003ctd\u003e f\/5.6\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003eNuméro d'objectif\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e Conception triple\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003eMise au point arrière\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e 55 mm (à partir de la base du filetage mâle M48)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003ePoids\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e 0,63kg\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003e \u003cb\u003eType de filetage arrière\u003c\/b\u003e\n\u003c\/td\u003e\n\n\u003ctd\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e M54 × 0,75\u003c\/li\u003e\n\n\u003cli\u003e M54 × 0,75-M48 × 0,75 (filetage du filtre M48 × 0,75 à l'intérieur) \u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\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":47636055032093,"sku":"ASK-ASKAR140R","price":461.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/7aa725af-9cf7-4e43-9110-3003e039fd08_1ac241f4-f6d7-4ae3-b7b3-93ea3908ef1e.jpg?v=1722021035"},{"product_id":"askar-1x-field-flattener-for-140apo","title":"Askar 1x aplatisseur de champ pour 140APO","description":"\u003cul\u003e\n\n\u003cli\u003e\n\n 1x aplatisseur de champ conçu spécifiquement pour le télescope Askar 140APO\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Corrige la courbure du champ sans changer la distance focale \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'Askar 1x Field Flattener pour 140APO est un accessoire optique spécialisé conçu pour améliorer les performances d'imagerie du télescope Askar 140APO. Cet aplatisseur de champ corrige la courbure du champ, garantissant des étoiles nettes et bien définies sur tout le champ de vision, en particulier sur les bords de l'image où les effets de courbure sont les plus prononcés. \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 Spécialement conçu pour être utilisé avec le télescope Askar 140APO. Assurez-vous de la compatibilité avec la taille du capteur de votre appareil photo avant l'achat.\n\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003cdiv\u003e\n\n\u003ch3\u003e \nPerformances optiques \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 1x Field Flattener est doté d'optiques de haute qualité conçues pour corriger la courbure du champ sans altérer la distance focale du télescope. Cela signifie que vous conservez la distance focale et le rapport f natifs de votre 140APO tout en obtenant des images plates et sans distorsion sur l'ensemble du champ, même avec des capteurs plus grands. \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=\"Askar 1x aplatisseur de champ pour 140APO\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/70b28f96-c0b8-45bc-adda-8609de7bb199_1.jpg?v=1722023435\" 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 Capacités d'imagerie améliorées \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=\"Askar 1x aplatisseur de champ pour 140APO\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/3e763178-4f44-4891-aa96-80feaab8a5e0_e74c68a7-3aed-436d-9c06-c9b66640de51.jpg?v=1722023436\" 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 corrigeant la courbure du champ, cet aplatisseur permet d'améliorer considérablement la netteté bord à bord de vos astrophotographies. Les étoiles restent précises sur tout le cadre et les objets étendus conservent leur forme et leurs détails même dans les coins de l'image. Ceci est particulièrement utile pour l’imagerie grand champ de grandes nébuleuses, champs d’étoiles et galaxies.\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 Grossissement 1x\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e \nContrairement aux réducteurs de focale, cet aplatisseur de champ maintient la distance focale d'origine de votre télescope. Ce grossissement 1x garantit que vous conservez le champ de vision natif et le rapport f de votre 140APO, préservant ainsi ses caractéristiques optiques inhérentes tout en améliorant la qualité globale de l'image.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Qualité de construction\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Construit avec des matériaux de haute qualité et des optiques de précision, l'aplatisseur de champ est conçu pour résister aux rigueurs d'une utilisation fréquente et maintenir son alignement optique. La construction robuste garantit des performances constantes dans le temps, ce qui en fait un ajout fiable à votre configuration d'astrophotographie.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Intégration facile\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Conçu spécifiquement pour l'Askar 140APO, cet aplatisseur de champ assure une intégration transparente avec votre télescope. Il comporte probablement des filetages ou des adaptateurs standard à fixer à votre train d'imagerie, permettant une installation et un retrait simples selon les besoins.\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 \nBien qu'optimisé pour une utilisation avec le 140APO, cet aplatisseur de champ peut potentiellement être utilisé avec d'autres télescopes de rapport focal similaire, bien que les meilleures performances soient obtenues avec le télescope prévu. Il convient à un large éventail de projets d'astrophotographie, depuis les prises de vue à grand champ de la Voie lactée jusqu'aux images détaillées des galaxies et des nébuleuses.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Considérations techniques\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n - Grossissement : 1x (pas de changement de distance focale)\n - Optimisé pour : télescope Askar 140APO\n - Couverture du capteur : probablement optimisée pour les capteurs plein format, mais également efficace avec des capteurs plus petits\n - Backfocus : reportez-vous aux spécifications du fabricant pour un espacement optimal des caméras\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":47636067615005,"sku":"ASK-ASKAR140FL","price":461.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/4930810f-9de1-46ee-a4ba-28f63ecc8ddd.png?v=1722023524"},{"product_id":"askar-0-75x-71f-reducer","title":"Askar 0.75x 71F Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e0.75x Reduction Factor\u003c\/li\u003e\n\u003cli\u003eTransforms Askar 71F to f\/5.2\u003c\/li\u003e\n\u003cli\u003eNew Focal Length: 369mm\u003c\/li\u003e\n\u003cli\u003eStandard 55mm Back Focus\u003c\/li\u003e\n\u003cli\u003eTriplet Optical Design\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 0.75x 71F Reducer\u003c\/h2\u003e\n\u003cp\u003eThe Askar 0.75x 71F Reducer transforms the Askar 71F refractor into a faster f\/5.2 imaging system with a new focal length of 369mm. This triplet reducer provides a standard 55mm back focus for easy camera integration and weighs just 0.23kg.\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 Faster Askar 71F: The 0.75x Reduction to f\/5.2\u003c\/h3\u003e\n\u003cp\u003eBy reducing the native focal ratio of the Askar 71F to f\/5.2, this corrector significantly shortens required exposure times, allowing you to gather more signal on faint targets in a single session. The resulting 369mm focal length creates a wider field of view, ideal for framing large emission nebulae like the North American Nebula (NGC 7000) or sprawling star clusters. Its triplet optical design is engineered specifically to maintain image sharpness across the 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\u003eFull-Frame Correction with 55mm Standard Back Focus\u003c\/h3\u003e\n\u003cp\u003eThis reducer is also a dedicated field flattener, designed to produce sharp stars out to the corners of full-frame sensors. Imaging integration is straightforward thanks to a standard 55mm back focus, measured from the base of its M48 male thread, simplifying connection to your DSLR or dedicated astronomy camera. The design also incorporates threads for standard 2-inch filters, allowing you to use light pollution or narrowband filters without adding extra spacing to your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of using the Askar 0.75x Reducer with my 71F telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is speed. It reduces the focal ratio to f\/5.2, which cuts your exposure times significantly compared to the native f\/7 ratio. This allows you to collect more data on faint objects in less time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my camera to the Askar 71F 0.75x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer provides a standard \u003cstrong\u003e55mm back focus\u003c\/strong\u003e from the base of its M48 male thread. You will need to use a combination of M48 spacers and adapters to place your camera's sensor at exactly this distance to achieve a flat field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Askar 0.75x reducer suitable for imaging the Andromeda Galaxy (M31) with a full-frame camera on the 71F?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reduced focal length of \u003cstrong\u003e369mm\u003c\/strong\u003e provides a wide field of view that is excellent for large targets like the Andromeda Galaxy (M31) or the Heart and Soul Nebulae. The reducer is designed to flatten the field for full-frame sensors, ensuring sharp stars across the entire frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Askar 0.75x 71F Reducer also work as a field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is a reducer-flattener. Its \u003cstrong\u003etriplet optical design\u003c\/strong\u003e corrects for field curvature, ensuring that stars are sharp from the center to the edges of the image, which is critical for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the Askar 0.75x Reducer on my 71F?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer's connection system is designed to accommodate standard 2-inch (M48x0.75) filters. You can thread them directly into the imaging train, making it easy to use narrowband or light pollution filters for targets like the Orion Nebula (M42).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the image circle of the Askar 0.75x 71F Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer is designed as a full-frame corrector. It effectively illuminates and flattens the field for camera sensors up to a 35mm format (43mm diagonal), making it compatible with a wide range of DSLRs and dedicated astronomy cameras.\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\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.75x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Length (with 71F)\u003c\/td\u003e\n\u003ctd\u003e369mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Ratio (with 71F)\u003c\/td\u003e\n\u003ctd\u003ef\/5.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eTriplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from the base of M48 male thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Thread\u003c\/td\u003e\n\u003ctd\u003eM59*1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.23kg\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 0.75x 71F Reducer\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":49200895263005,"sku":"ASK-ASKAR71R","price":291.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-Reducer-71F-1.jpg?v=1727375509"},{"product_id":"askar-1x-field-flattener-for-103apo-copy","title":"Askar 1x Field Flattener for 120APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned specifically for the Askar 120APO Telescope\u003c\/li\u003e\n\u003cli\u003e1x Magnification Factor\u003c\/li\u003e\n\u003cli\u003eTriplet Optical Design\u003c\/li\u003e\n\u003cli\u003eMaintains Native f\/7 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eStandard 55mm Back Focus\u003c\/li\u003e\n\u003cli\u003eWeighs 0.75kg\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 1x Field Flattener for 120APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar 1x Field Flattener for the 120APO is a dedicated triplet corrector that maintains the telescope's native 840mm focal length and f\/7 focal ratio. It establishes a standard 55mm back focus from its M48 male thread, ensuring compatibility with common imaging trains. Weighing 0.75kg, it provides robust optical correction without significantly altering the instrument's balance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTriplet Optics: Correcting the 120APO's f\/7 Field Edge-to-Edge\u003c\/h3\u003e\n\u003cp\u003eThis 1x flattener is engineered specifically for the Askar 120APO, using a triplet optical design to eliminate field curvature and coma across large imaging sensors. By maintaining the telescope's native f\/7 focal ratio, it prevents any change in image scale or exposure times. The result is a perfectly flat field, rendering stars as sharp points from the center to the corners of a full-frame sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMechanical Design: 55mm Back Focus and Integrated Filter Threads\u003c\/h3\u003e\n\u003cp\u003eIntegration into your imaging train is straightforward, with a standard 55mm back focus measured from the base of the M48 male thread. The camera side includes both M54x0.75 and M48x0.75 adapters, and the M48 adapter features internal threads for 2-inch filters, allowing you to add light pollution or narrowband filters without extra spacers. The entire 0.75kg housing is CNC-machined for precise alignment and includes threaded metal caps for protection.\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\"\u003eDoes the Askar 1x Flattener change the focal length of the 120APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. As a 1x flattener, it is designed to maintain the Askar 120APO's native 840mm focal length and f\/7 focal ratio. It corrects for field curvature without altering the image scale.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the back focus for the Askar 120APO 1x Flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe required back focus is a standard \u003cstrong\u003e55mm\u003c\/strong\u003e, measured from the base of the male M48x0.75 thread on the included adapter. This simplifies connecting most DSLRs (with a T-ring) and dedicated astronomy cameras with filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a 2-inch filter to the Askar 120APO Flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe flattener comes with an M48 adapter that has internal M48x0.75 threads. You can screw a standard 2-inch mounted filter directly into this adapter before attaching your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this flattener with a full-frame camera on my Askar 120APO to image the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this flattener is designed to fully illuminate and correct the field for full-frame sensors. When paired with the Askar 120APO's 840mm focal length, it provides an ideal image scale for large targets like the Andromeda Galaxy (M31) or the North America Nebula (NGC 7000), ensuring sharp stars across the entire frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapters are included with the Askar 1x Flattener for the 120APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe flattener provides two connection options on the camera side: a native M54×0.75 thread and an included adapter to step down to a standard M48×0.75 male thread for connecting most imaging equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 0.75kg flattener affect the balance of my Askar 120APO setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a weight of 0.75kg, the flattener will add some weight to the back of the telescope. You will likely need to re-balance your 120APO on its mount, especially after adding a camera and other accessories, to ensure accurate tracking.\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\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eTriplet (3-element)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification\u003c\/td\u003e\n\u003ctd\u003e1x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescope\u003c\/td\u003e\n\u003ctd\u003eAskar 120APO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length (with 120APO)\u003c\/td\u003e\n\u003ctd\u003e840mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio (with 120APO)\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from M48 thread base)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera-Side Threads\u003c\/td\u003e\n\u003ctd\u003eM54x0.75 \u0026amp; M48x0.75 (via adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 (2-inch) inside M48 adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.75 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\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":50391393960221,"sku":"ASK-ASKFL12010","price":306.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image_46b46ed0-dfff-499d-855f-a8e38dbde457.png?v=1758732981"},{"product_id":"askar-0-8x-reducer-for-120apo","title":"Askar 0.8x Reducer for 120APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces Askar 120APO to a fast f\/5.6 focal ratio\u003c\/li\u003e\n\u003cli\u003eShortens focal length to 672mm for wider fields of view\u003c\/li\u003e\n\u003cli\u003eTriplet optical design provides field flattening\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus from the M48 thread\u003c\/li\u003e\n\u003cli\u003eFeatures M68, M54, and M48 connection threads\u003c\/li\u003e\n\u003cli\u003eInternal M48x0.75 thread for 2\" filters\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 0.8x Reducer for 120APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar 0.8x Reducer for 120APO transforms the telescope into a faster f\/5.6 imaging system, shortening its focal length to 672mm for capturing wider fields of view. This dedicated triplet reducer also functions as a field flattener, delivering sharp stars across the frame while maintaining the industry-standard 55mm back focus from its M48 thread for seamless integration with your imaging train.\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 Faster f\/5.6 Focal Ratio and 672mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eBy reducing the native f\/7 focal ratio of the Askar 120APO to a faster f\/5.6, this accessory significantly cuts down required exposure times, allowing you to gather more signal in less time. The corresponding focal length of 672mm creates a wider true field of view, perfect for framing large deep-sky objects like the Andromeda Galaxy (M31) or sprawling emission nebulae like the North America Nebula (NGC 7000).\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\u003eTriplet Optics Correcting for a 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eEngineered with a three-element triplet optical design, this unit does more than just reduce the focal length; it actively corrects for field curvature. This ensures stars remain tight and point-like from the center to the edge of your sensor. The reducer is designed to achieve this correction at a standard 55mm back focus distance from the base of the M48 male thread, simplifying camera and accessory spacing.\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\u003eM48, M54, and M68 Threads for a 0.75kg Payload\u003c\/h3\u003e\n\u003cp\u003eThis reducer provides a versatile set of connection options to accommodate various imaging setups, including M68x1, M54x0.75, and a standard M48x0.75 male thread. An internal M48 thread is also included for direct mounting of 2-inch filters. At 0.75kg, the reducer has a solid, CNC-machined build that requires re-balancing your telescope to accommodate the added weight on the imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 0.8x reducer change the Askar 120APO's performance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer makes the Askar 120APO optically \"faster,\" changing its focal ratio from f\/7 to \u003cstrong\u003ef\/5.6\u003c\/strong\u003e. This reduces exposure times and provides a wider field of view by shortening the focal length to \u003cstrong\u003e672mm\u003c\/strong\u003e. It also functions as a field flattener, correcting for optical aberrations to keep stars sharp across the image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the correct back focus for the Askar 120APO 0.8x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe required back focus is a standard \u003cstrong\u003e55mm\u003c\/strong\u003e. This distance is measured from the base of the male M48x0.75 thread to your camera's sensor. This spacing is common for DSLR cameras with a T-ring or for dedicated astronomy cameras when combined with filter wheels and off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the Askar 120APO 0.8x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer features a built-in female \u003cstrong\u003eM48x0.75 thread\u003c\/strong\u003e on the telescope side of the M48 adapter, which is designed to accept standard 2-inch astronomy filters. This allows you to thread filters directly into the optical train for light pollution suppression or narrowband imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 0.8x Reducer just a reducer or also a flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is both. While its primary function is to reduce the focal length, the \u003cstrong\u003etriplet optical design\u003c\/strong\u003e is engineered to correct for field curvature, an aberration common in refractor telescopes. This ensures that stars are sharp not only in the center of your image but also at the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this reducer allow me to image the entire Andromeda Galaxy (M31) with the Askar 120APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for most camera sensors. The reduced focal length of \u003cstrong\u003e672mm\u003c\/strong\u003e provides a much wider field of view than the native telescope. This makes it ideal for capturing large targets like the Andromeda Galaxy (M31) or the Heart and Soul Nebulae (IC 1805 and IC 1848) within a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIf I'm imaging the Pleiades (M45) with the Askar 120APO, what's the main benefit of using this 0.8x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main benefit is framing. The Pleiades (M45) is a large open star cluster, and at the native focal length of the 120APO, it can be difficult to fit the entire cluster and its surrounding nebulosity in the frame. The \u003cstrong\u003e672mm\u003c\/strong\u003e reduced focal length provides the wide field necessary to capture the cluster in its entirety, while the faster \u003cstrong\u003ef\/5.6\u003c\/strong\u003e optics will better capture the faint, blue reflection nebulosity with shorter exposures.\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\u003eTelescope Compatibility\u003c\/td\u003e\n\u003ctd\u003eAskar 120APO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Length\u003c\/td\u003e\n\u003ctd\u003e672mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eTriplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from base of M48 male thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection Threads\u003c\/td\u003e\n\u003ctd\u003eM68x1, M54x0.75, M48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 (Internal, for 2\" filters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.75 kg\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 0.8x Reducer for 120APO\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:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_120APO_0.8x_Reducer_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/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":50391397204253,"sku":"ASK-ASKRE12008","price":306.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image_a31c9216-816d-44c9-bf49-9aaa6f3eaaa9.png?v=1758733646"},{"product_id":"askar-111f","title":"Askar 111F 0.74× Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces Telescope Focal Ratio to f\/5.1\u003c\/li\u003e\n\u003cli\u003eCreates a 566mm Focal Length Imaging System\u003c\/li\u003e\n\u003cli\u003eTriplet Optical Design for Field Flattening\u003c\/li\u003e\n\u003cli\u003eProvides Standard 55mm Back Focus\u003c\/li\u003e\n\u003cli\u003eWeighs 0.5kg\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\u003eAskar 111F 0.74× Reducer\u003c\/h2\u003e\n\u003cp\u003eThe Askar 111F 0.74× Reducer converts the telescope into a fast f\/5.1 astrograph, shortening the focal length to 566mm for wider fields of view. This triplet reducer establishes a standard 55mm back focus from its M48 male thread and weighs just 0.5kg, ensuring compatibility with a wide range of modern imaging cameras and accessories.\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\u003ef\/5.1 Speed: A 0.74x Reduction for Wider Fields\u003c\/h3\u003e\n\u003cp\u003eBy reducing the focal ratio to f\/5.1, this accessory significantly cuts down the required exposure time for faint deep-sky objects. The corresponding 566mm focal length widens the field of view, allowing you to frame large targets like the Andromeda Galaxy (M31) or the North America Nebula (NGC 7000) in their entirety on a full-frame sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptical Correction: A 3-Element Design for Flat Fields\u003c\/h3\u003e\n\u003cp\u003eThe internal triplet lens design corrects for field curvature, ensuring stars remain sharp and round from the center to the edge of the frame. This level of correction is critical for modern, large-format CMOS and CCD sensors, eliminating optical distortions that would otherwise elongate stars in the corners of your images.\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\u003eMechanical Design: 55mm Back Focus and Integrated Filter Threads\u003c\/h3\u003e\n\u003cp\u003eEngineered for seamless integration, the reducer presents a standard 55mm back focus distance measured from the base of its M48 male camera connection. This simplifies the process of adding off-axis guiders or filter wheels into your imaging train. The reducer attaches to the telescope's focuser via an M68x1 thread, and the camera-side adapter includes threads for standard 2-inch (M48x0.75) filters.\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 benefit of the Askar 111F 0.74x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is speed. By converting the Askar 111F to an \u003cstrong\u003ef\/5.1\u003c\/strong\u003e system with a \u003cstrong\u003e566mm\u003c\/strong\u003e focal length, it reduces exposure times by approximately 45% compared to the native focal ratio. This allows you to capture more data on faint objects in less time while also providing a wider field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the correct 55mm spacing for the 111F 0.74x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e55mm back focus\u003c\/strong\u003e is measured from the base of the M48 male thread on the reducer to your camera's sensor. Most dedicated astronomy cameras and DSLR\/mirrorless camera T-rings are designed to this 55mm standard, so in many cases, you can connect your camera directly. If you add a filter wheel or off-axis guider, you must use extension rings to ensure the total distance remains exactly 55mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with the Askar 111F 0.74x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer features a built-in M48x0.75 thread on the camera side, which allows you to directly attach standard \u003cstrong\u003e2-inch astronomical filters\u003c\/strong\u003e. This is ideal for using light pollution, narrowband, or LRGB filters without needing a separate filter drawer or wheel for simple setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 111F 0.74x Reducer change my image of the Andromeda Galaxy (M31) with the Askar 111F?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe native focal length of the Askar 111F is too long to fit the entire Andromeda Galaxy (M31) and its satellite galaxies on a full-frame sensor. By shortening the focal length to \u003cstrong\u003e566mm\u003c\/strong\u003e, the 0.74x Reducer provides a field of view wide enough to capture the full expanse of the galaxy in a single frame, making it an essential accessory for imaging large celestial targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 111F 0.74x Reducer work with my full-frame camera on the Askar 111F?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003etriplet\u003c\/strong\u003e optical design is corrected for a large image circle sufficient for full-frame sensors. It effectively flattens the field to ensure that stars in the corners of a full-frame image remain sharp and are not affected by coma or field curvature.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 111F 0.74x Reducer compatible with other telescopes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this reducer is an optically matched accessory designed specifically for the Askar 111F APO Triplet Refractor. Using it with other telescopes will likely result in poor optical correction and an inability to reach focus.\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\u003eReduced Focal Length\u003c\/td\u003e\n\u003ctd\u003e566mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eTriplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from base of M48 male thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection Thread\u003c\/td\u003e\n\u003ctd\u003eM68x1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.5 kg\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\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_111F_Flat-Field_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\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":52851331006749,"sku":"ASK-ASAPO111R","price":419.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-111F-0-74-Reducer-1_ab87a539-90f5-488c-aeaf-5554073315a8.jpg?v=1788401687"},{"product_id":"askar-1x-flattener-for-185apo","title":"Askar 185APO 1x Full-frame Flattener","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMaintains Native f\/7 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eMaintains Native 1295mm Focal Length\u003c\/li\u003e\n\u003cli\u003eTriplet Optical Design\u003c\/li\u003e\n\u003cli\u003eStandard 55mm Back Focus\u003c\/li\u003e\n\u003cli\u003eIncludes M68, M54 \u0026amp; M48 Adapters\u003c\/li\u003e\n\u003cli\u003eWeight: 0.74kg\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 185APO 1x Full-frame Flattener\u003c\/h2\u003e\n\u003cp\u003eThe Askar 185APO 1x Full-frame Flattener is a dedicated triplet corrector that maintains the telescope's native 1295mm focal length and f\/7 focal ratio for maximum image scale. It establishes a standard 55mm back focus from its M48 male thread and includes M68 and M54 adapters for versatile camera connection, all within a 0.74kg assembly.\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\u003eTriplet Optics: Full-Frame Correction at a Native f\/7\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically for the Askar 185APO, this flattener uses a three-element optical layout to eliminate field curvature and coma across a full-frame sensor. By preserving the telescope's native f\/7 focal ratio, you can capture deep-sky objects with the highest possible resolution, ensuring that stars remain sharp and pinpoint from the center of the frame to the corners.\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\u003e55mm Back Focus with M68, M54, and M48 Adapters\u003c\/h3\u003e\n\u003cp\u003eThis flattener simplifies your imaging train by adhering to the industry-standard 55mm back focus distance. This spacing is ideal for use with DSLRs, mirrorless cameras, and dedicated astronomy cameras connected to a filter wheel. The unit includes M68×1, M54×0.75, and M48×0.75 adapters, providing robust, threaded connections for a wide range of equipment. A built-in M48×0.75 thread also allows for the direct installation of 2-inch filters.\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\u003e1x Flattener vs. 0.8x Reducer: Imaging at the Native 1295mm Focal Length\u003c\/h3\u003e\n\u003cp\u003eChoosing between this 1x flattener and the optional 0.8x reducer depends entirely on your target. The 1x flattener is the superior choice when image scale is the priority, allowing you to resolve fine details in smaller targets like the Whirlpool Galaxy (M51) or the Ring Nebula (M57) at the full 1295mm focal length. The reducer, in contrast, provides a wider field of view and a faster f\/5.6 focal ratio, better suited for capturing large nebulae like the North American Nebula (NGC 7000) in a single frame.\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 purpose of the Askar 185APO 1x Flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of the Askar 185APO 1x Flattener is to correct for optical aberrations inherent in refractor telescopes, specifically \u003cstrong\u003efield curvature\u003c\/strong\u003e. It ensures that stars are sharp and round across the entire imaging sensor, especially larger full-frame sensors, without changing the telescope's native \u003cstrong\u003e1295mm focal length\u003c\/strong\u003e or \u003cstrong\u003ef\/7 focal ratio\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the correct 55mm back focus with the 185APO 1x Flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e55mm back focus\u003c\/strong\u003e is measured from the base of the M48 male thread on the included adapter to your camera's sensor. Most dedicated astronomy cameras, when paired with a filter wheel and off-axis guider, are designed to meet this 55mm standard. For DSLR or mirrorless cameras, a standard 48mm T-ring is typically all that is needed to achieve the correct spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the Askar 185APO 1x Flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The flattener's M54-to-M48 adapter has an internal \u003cstrong\u003eM48×0.75 filter thread\u003c\/strong\u003e. This allows you to screw a standard 2-inch astronomy filter directly into the imaging train before it connects to your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 1x flattener work with telescopes other than the Askar 185APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this flattener is optically matched specifically for the Askar 185APO refractor. Using it with other telescopes will likely result in poor optical correction and may not reach focus. For best results, always use the dedicated flattener designed for your specific telescope model.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 185APO 1x Flattener or the 0.8x reducer better for imaging the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a relatively small target like the Whirlpool Galaxy (M51), the \u003cstrong\u003e1x flattener\u003c\/strong\u003e is the ideal choice. It preserves the telescope's native \u003cstrong\u003e1295mm focal length\u003c\/strong\u003e, providing the maximum image scale to resolve details like spiral arms and dust lanes. The 0.8x reducer would shrink the galaxy on the sensor, making it less detailed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat camera combination works with the 55mm back focus of the 185APO 1x Flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard setup for the \u003cstrong\u003e55mm back focus\u003c\/strong\u003e would be a dedicated astronomy camera (e.g., ZWO or QHY) with a sensor-to-flange distance of 17.5mm, connected to a 21mm filter wheel and a 16.5mm off-axis guider. This combination totals exactly 55mm. Alternatively, a DSLR with a standard T-ring also meets the 55mm requirement.\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\u003eFocal Length (with 185APO)\u003c\/td\u003e\n\u003ctd\u003e1295mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio (with 185APO)\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eTriplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from base of M48 male thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.74kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-end Threads\u003c\/td\u003e\n\u003ctd\u003eM68×1, M54×0.75, M48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003eM48×0.75 (inside M48 adapter)\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\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_185APO_1x_Flattener_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e185APO 1x Full-frame Flattener\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\"\u003eFront Dust Cap\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\"\u003eRear Dust Cap\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:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_185APO_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/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":52851334971677,"sku":"ASK-ASKFL18510","price":460.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-185APO-1x-Full-frame-Flattener-1_f8658ff2-b22c-4344-927f-2ace2e320c21.jpg?v=1788401737"},{"product_id":"askar-0-8x-reducer-for-185apo","title":"Askar 185APO 0.8x Full-frame Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces Askar 185APO to f\/5.6\u003c\/li\u003e\n\u003cli\u003eResulting Focal Length: 1036mm\u003c\/li\u003e\n\u003cli\u003e4-Element Quadruplet Optical Design\u003c\/li\u003e\n\u003cli\u003eStandard 55mm Back Focus\u003c\/li\u003e\n\u003cli\u003eIlluminates Full-Frame Sensors\u003c\/li\u003e\n\u003cli\u003eWeight: 0.95kg\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 185APO 0.8x Full-frame Reducer\u003c\/h2\u003e\n\u003cp\u003eThe Askar 185APO 0.8x Full-frame Reducer transforms its dedicated telescope into a faster, wider imaging system, shortening the native focal ratio to f\/5.6 and the focal length to 1036mm. Its 4-element quadruplet design corrects for field curvature across a full-frame sensor, while the standard 55mm back focus ensures compatibility with a wide range of cameras and accessories. Weighing just 0.95kg, it provides multiple rear-end threads including M68×1, M54×0.75, and M48×0.75 for direct integration into your imaging train.\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\u003eQuadruplet Optics: Reducing the 185APO to a Fast f\/5.6\u003c\/h3\u003e\n\u003cp\u003eThis reducer is engineered specifically for the Askar 185APO, converting it to a faster f\/5.6 instrument. This reduction in focal ratio significantly cuts required exposure times and expands the field of view, making it ideal for capturing vast emission nebulae like the North American Nebula (NGC 7000) or sprawling star clusters in a single frame. The 4-element quadruplet optical design acts as a field flattener, ensuring stars remain sharp and pinpoint across the entire full-frame image circle without introducing optical aberrations.\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\u003e55mm Back Focus and Flexible Full-Frame Connections\u003c\/h3\u003e\n\u003cp\u003eIntegration with your existing gear is straightforward. The reducer provides a standard 55mm back focus distance measured from the base of its M48 male thread, matching the requirement for DSLRs with a T-ring and many cooled astronomy cameras when used with a filter wheel. For maximum flexibility, the reducer includes M68×1, M54×0.75, and M48×0.75 adapters on the camera side. It also features an internal M48×0.75 thread, allowing you to mount standard 2-inch filters directly inside the reducer body, simplifying your optical train and maintaining correct spacing.\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 benefit of using the 0.8x reducer with the Askar 185APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is speed. By reducing the focal ratio to f\/5.6, you can gather the same amount of light in a significantly shorter time compared to the telescope's native f\/7. This allows for higher quality images with less total exposure time and reduces demands on your mount's tracking accuracy. It also provides a wider field of view for imaging large celestial objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar 185APO 0.8x Reducer achieve a flat field?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer uses a \u003cstrong\u003e4-element quadruplet optical design\u003c\/strong\u003e. This sophisticated lens arrangement is engineered not only to reduce the focal length but also to correct for off-axis aberrations like field curvature and coma, which are common in fast optical systems. This ensures that stars are sharp and round from the center of the image to the corners of a full-frame sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 55mm back focus on the 185APO reducer compatible with my DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The standard 55mm back focus is the industry standard for DSLR and mirrorless cameras when using a typical T-ring adapter. You can attach your camera directly to the reducer's M48 thread with the appropriate T-ring for your camera model and achieve perfect spacing without extra calculations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the Askar 185APO 0.8x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer features a built-in M48×0.75 female thread on the camera side, which is the standard for 2-inch astronomy filters. You can thread your filters directly into the reducer itself, placing them at an optimal position within the light path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the 185APO 0.8x Reducer change my framing for a large target like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith the reducer, the 185APO operates at a 1036mm focal length. This wider field of view is much better suited for capturing the full extent of massive objects like the Andromeda Galaxy (M31) or the Veil Nebula complex on a full-frame sensor. Without the reducer, you would likely need to create a multi-panel mosaic to capture these targets in their entirety.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a cooled camera with a 20mm filter wheel. How do I achieve the 55mm back focus with the 185APO reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 55mm back focus is measured from the M48 thread flange on the reducer. You'll need to account for the light path consumed by your equipment. If your camera sensor's back focus is 17.5mm and your filter wheel is 20mm thick, you have used 37.5mm of the available 55mm. You would need 17.5mm of M48 extension tubes between the reducer and your filter wheel to achieve the correct spacing.\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\u003eFocal Length (with 185APO)\u003c\/td\u003e\n\u003ctd\u003e1036mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio (with 185APO)\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eQuadruplet (4-Element)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from base of M48 male thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.95kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-end Connection Threads\u003c\/td\u003e\n\u003ctd\u003eM68×1, M54×0.75, M48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Filter Thread\u003c\/td\u003e\n\u003ctd\u003eM48×0.75 (2-inch)\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\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_185APO_0.8x_Reducer_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e185APO 0.8x Full-frame Reducer\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\"\u003eFront Dust Cap\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\"\u003eRear Dust Cap\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:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_2025_First_Half_Product_Collection_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/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":52851335201053,"sku":"ASK-ASKRE18508","price":460.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-185APO-0-8x-Full-frame-Reducer-1_fc1d732e-256e-44e9-b8a9-6b75ba94c728.jpg?v=1788401745"},{"product_id":"askar-0-75x-reducer-for-60f","title":"Askar 60F 0.75x Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e0.75x Focal Reduction\u003c\/li\u003e\n\u003cli\u003eReduces Focal Length to 311mm\u003c\/li\u003e\n\u003cli\u003eCreates a Fast f\/5.1 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e44mm Full-Frame Image Circle\u003c\/li\u003e\n\u003cli\u003eStandard 55mm Back Focus\u003c\/li\u003e\n\u003cli\u003eTriplet Optical Design\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\u003eAskar 60F 0.75x Reducer\u003c\/h2\u003e\n\u003cp\u003eDesigned exclusively for the Askar 60F refractor, this 0.75x Reducer transforms the telescope into a faster, wider imaging system, shortening the focal length to 311mm and the focal ratio to a swift f\/5.1. The three-element triplet optical design simultaneously flattens the field, delivering a corrected 44mm image circle that fully illuminates full-frame sensors with a standard 55mm back 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\u003e0.75x Reduction: Transform Your 60F to a Fast f\/5.1 Astrograph\u003c\/h3\u003e\n\u003cp\u003eBy converting your Askar 60F to an f\/5.1 instrument, this reducer significantly cuts down required exposure times, allowing you to gather more signal in less time. This speed is critical for capturing faint details in nebulae or for imaging transient objects. The wider field of view produced by the 311mm focal length makes it possible to frame large targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety.\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\u003eTriplet Optics: A Flat 44mm Image Circle for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThe reducer employs a three-element, air-spaced triplet lens configuration that acts as a field flattener, correcting for the optical aberrations inherent in a curved focal plane. This results in a 44mm image circle, large enough to cover modern full-frame CMOS and CCD sensors without vignetting. You will see sharp, point-like stars across the entire frame, from the center to the very corners of your images.\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\u003eSeamless Integration: 55mm Back Focus and Built-in Filter Cell\u003c\/h3\u003e\n\u003cp\u003eEngineered for convenience, the reducer features a standard 55mm back focus from its M48 male threads, simplifying the process of connecting DSLRs, mirrorless cameras, or dedicated astronomy cameras with standard spacers. A key feature is the integrated M48x0.75 thread at the front of the adapter, which allows you to directly attach 2-inch filters. This eliminates the need for a separate filter drawer or wheel in your imaging train, saving precious back focus and reducing complexity.\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 benefit of using the 60F 0.75x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefits are speed and field of view. The reducer converts the Askar 60F to a faster \u003cstrong\u003ef\/5.1\u003c\/strong\u003e optical system, which dramatically shortens exposure times. It also widens the field of view by reducing the focal length to \u003cstrong\u003e311mm\u003c\/strong\u003e, allowing you to capture larger celestial objects in a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 0.75x reducer work with telescopes other than the Askar 60F?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This reducer is optically designed and threaded specifically for the Askar 60F refractor. Using it with other telescopes will result in poor optical performance and an inability to reach focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the 60F 0.75x Reducer support full-frame cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. It is designed to produce a flat, fully-illuminated \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, which is large enough to cover the sensors of full-frame DSLR, mirrorless, and dedicated astronomy cameras without significant vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install a 2-inch filter with this 60F reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer's adapter has a built-in \u003cstrong\u003eM48x0.75 thread\u003c\/strong\u003e at the front. You can simply screw any standard 2-inch astronomy filter directly into this thread, placing it securely in the optical path without needing a separate filter holder.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 60F 0.75x Reducer help when imaging a large target like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBy reducing the focal length to \u003cstrong\u003e311mm\u003c\/strong\u003e, the reducer provides a much wider field of view than the native telescope. This allows you to frame the entirety of the Andromeda Galaxy (M31) and its satellite galaxies M32 and M110 in a single shot. The faster \u003cstrong\u003ef\/5.1\u003c\/strong\u003e focal ratio also helps capture the faint outer arms of the galaxy more efficiently.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 55mm back focus of the Askar 60F Reducer difficult to achieve?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, \u003cstrong\u003e55mm\u003c\/strong\u003e is the industry standard for back focus. Most DSLR and mirrorless cameras with a standard 10mm T-ring achieve this distance perfectly. For dedicated astronomy cameras, achieving 55mm is straightforward using a combination of standard M48 extension tubes that are readily available.\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\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.75x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Length\u003c\/td\u003e\n\u003ctd\u003e311mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eTriplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from M48 male thread base)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-end Thread\u003c\/td\u003e\n\u003ctd\u003eM50x1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.2kg\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 60F 0.75x Reducer\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\"\u003eFront Metal Dust Cap\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\"\u003eRear Metal Dust Cap\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\/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":52851335430429,"sku":"ASK-ASKAR60R","price":279.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-60F-0-75x-Reducer-1_c52c17eb-7904-4f98-9eee-8d2f4173fd83.jpg?v=1788401754"},{"product_id":"askar-0-75x-reducer-for-91f","title":"Askar 91F 0.75x Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces focal ratio to a fast f\/5\u003c\/li\u003e\n\u003cli\u003e0.75x reduction factor for wider fields of view\u003c\/li\u003e\n\u003cli\u003eTriplet optical design provides field-flattening correction\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus from the M48 thread\u003c\/li\u003e\n\u003cli\u003eLightweight 0.3kg construction\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\u003eAskar 91F 0.75x Reducer\u003c\/h2\u003e\n\u003cp\u003eThe Askar 91F 0.75x Reducer transforms its dedicated telescope into a faster, wider imaging system, shortening the native focal length to 455mm and the focal ratio to a rapid f\/5. This triplet reducer is engineered to provide full-frame, field-flattened correction while maintaining a standard 55mm back focus for seamless integration with your existing M48-threaded imaging train.\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\u003eFaster f\/5 Imaging: The 0.75x Optical Advantage\u003c\/h3\u003e\n\u003cp\u003eBy decreasing the focal ratio to f\/5, this 0.75x reducer significantly cuts down required exposure times, allowing you to gather more signal on faint targets in less time. The wider field of view is ideal for capturing large-scale celestial objects that would otherwise be too expansive for the telescope's native field, such as the Andromeda Galaxy (M31) or the entire Veil Nebula complex.\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\u003eTriplet Design with 55mm Back Focus for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThe air-spaced triplet optical design not only reduces the focal length but also acts as a dedicated field flattener, ensuring sharp, point-like stars across a full-frame sensor. It establishes a standard 55mm back focus distance from its M48 male thread, simplifying the connection to DSLRs, mirrorless cameras, and dedicated astronomy cameras with common spacers.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Filter Thread:\u003c\/strong\u003e A built-in M48x0.75 thread allows you to mount 2-inch filters directly into the reducer, placing them securely within the optical path without needing a separate filter drawer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Connection:\u003c\/strong\u003e The reducer attaches to the Askar 91F focuser via a robust M59*1 thread, ensuring a rigid, tilt-free connection for imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Machining:\u003c\/strong\u003e The entire housing is CNC-machined for precision and durability, and includes threaded metal dust caps for protection when not in use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging with the Askar 91F: Native vs. f\/5 Reduced\u003c\/h3\u003e\n\u003cp\u003eThis reducer offers a critical choice for astrophotographers. Using the Askar 91F at its native focal length provides higher magnification, perfect for framing smaller galaxies or planetary nebulae where image scale is paramount. Attaching the 0.75x reducer is the superior option for large emission nebulae and star clusters, where its light-gathering speed and wider perspective are essential for capturing the entire object in a single frame.\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 does the 91F 0.75x Reducer do for my Askar 91F telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 91F 0.75x Reducer shortens your telescope's focal ratio to a faster f\/5 and focal length to 455mm. This provides two main benefits: a \u003cstrong\u003ewider field of view\u003c\/strong\u003e to fit larger objects in the frame, and \u003cstrong\u003eshorter exposure times\u003c\/strong\u003e to capture faint details more efficiently.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect the Askar 91F 0.75x Reducer to my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer provides a standard \u003cstrong\u003e55mm back focus\u003c\/strong\u003e from the base of its M48 male thread. This is a common standard for most astronomy cameras and DSLRs with the appropriate T-ring. You simply add or remove M48 spacers until the distance from the reducer's flange to your camera sensor is exactly 55mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the 91F 0.75x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The reducer has a built-in M48x0.75 female thread on the camera side, allowing you to directly screw in standard 2-inch astronomy filters. This is convenient for using light pollution or narrowband filters without needing a separate filter wheel or drawer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 91F 0.75x Reducer also a field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is. The triplet optical design is engineered to provide field-flattening correction specifically for the Askar 91F telescope. This ensures that stars remain sharp and round across the entire image, even at the edges of a full-frame sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich targets benefit most from the 91F 0.75x Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis reducer is ideal for large deep-sky objects that require a wide field of view. Excellent targets include the \u003cstrong\u003eNorth American Nebula (NGC 7000)\u003c\/strong\u003e, the \u003cstrong\u003eAndromeda Galaxy (M31)\u003c\/strong\u003e, and large star-forming regions like the Heart and Soul Nebulae (IC 1805 and IC 1848).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I *not* use the 91F 0.75x Reducer with my Askar 91F?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou should image without the reducer when your target is small and requires maximum image scale. For example, most galaxies like the Whirlpool Galaxy (M51), smaller planetary nebulae like the Ring Nebula (M57), or any planetary imaging would be better suited to the telescope's native, longer focal length.\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\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.75x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResulting Focal Length\u003c\/td\u003e\n\u003ctd\u003e455mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResulting Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eTriplet, Air-Spaced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from M48 thread base)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Thread\u003c\/td\u003e\n\u003ctd\u003eM59*1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Thread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 (Male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 (Female, for 2\" filters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.3kg\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\/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":52851336904989,"sku":"ASK-ASKAR91R","price":279.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-91F-0-75x-Reducer-1_234100f2-15d6-4254-a83f-7aaf11c45959.jpg?v=1788401763"},{"product_id":"askar-0-74x-reducer-for-131f","title":"Askar 131F 0.74× Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduces telescope focal ratio to f\/5.6\u003c\/li\u003e\n\u003cli\u003eAchieves a 733.6mm final focal length\u003c\/li\u003e\n\u003cli\u003eTriplet optical design for field flattening\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus from the M48 thread\u003c\/li\u003e\n\u003cli\u003eWeighs 0.56kg\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\u003eAskar 131F 0.74× Reducer\u003c\/h2\u003e\n\u003cp\u003eThe Askar 131F 0.74x Reducer converts the Askar 131F refractor into a faster f\/5.6 astrograph with a final focal length of 733.6mm. This dedicated triplet reducer provides a wider field of view and significantly shortens exposure times, all while maintaining a precise 55mm back focus distance and weighing just 0.56kg.\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\u003e0.74x Reduction: Transforming the 131F to an f\/5.6 Astrograph\u003c\/h3\u003e\n\u003cp\u003eBy reducing the native f\/7.5 optics of the Askar 131F to a faster f\/5.6, this reducer cuts required exposure times by nearly half. This speed is critical for capturing faint details in nebulae and galaxies. The triplet optical design doesn't just reduce the focal length to 733.6mm; it also flattens the field, ensuring stars remain sharp and round across a full-frame sensor from the center to the corners of your image.\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\u003eMechanical Design: 55mm Back Focus and Full-Frame Correction\u003c\/h3\u003e\n\u003cp\u003eEngineered for seamless integration, the reducer maintains the industry-standard 55mm back focus distance, measured from the base of its M48 male thread. This simplifies the process of connecting your DSLR, mirrorless, or dedicated astronomy camera with standard adapters and off-axis guiders. The main body features a rear-end M72x1 thread for a secure connection to the telescope's focuser, and the CNC-machined housing ensures precise optical alignment.\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 does the Askar 131F 0.74× Reducer do to my telescope's focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 0.74x Reducer shortens the Askar 131F's native focal length to \u003cstrong\u003e733.6mm\u003c\/strong\u003e and speeds up the focal ratio from f\/7.5 to \u003cstrong\u003ef\/5.6\u003c\/strong\u003e. This provides a wider field of view and gathers light more quickly, reducing your total imaging time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the back focus of the Askar 131F 0.74× Reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe required back focus is \u003cstrong\u003e55mm\u003c\/strong\u003e, measured from the base of the male M48 thread on the reducer. This is a standard distance that works directly with most DSLR cameras using a T-ring and many dedicated astronomy camera setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar 131F 0.74× Reducer help me image the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Andromeda Galaxy is a very large target. The reducer's \u003cstrong\u003e733.6mm\u003c\/strong\u003e focal length provides a wider field of view, allowing you to capture the entire galaxy and its faint outer arms within a single frame using a full-frame or APS-C sensor. The faster \u003cstrong\u003ef\/5.6\u003c\/strong\u003e optics will also help you capture more signal in less time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 131F 0.74× Reducer suitable for imaging large nebulae like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The wide field of view provided by the \u003cstrong\u003e733.6mm\u003c\/strong\u003e focal length is ideal for framing large emission nebulae like NGC 7000. Furthermore, the fast \u003cstrong\u003ef\/5.6\u003c\/strong\u003e focal ratio is highly effective at capturing faint hydrogen-alpha signal, making it a perfect match for such targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of optical correction does the Askar 131F 0.74× Reducer provide?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer uses a \u003cstrong\u003etriplet lens design\u003c\/strong\u003e. This multi-element configuration is engineered not only to reduce the focal length but also to act as a field flattener, correcting for the natural field curvature of the main optics. This ensures that stars are sharp across the entire imaging sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much does the Askar 131F 0.74× Reducer weigh?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe reducer weighs \u003cstrong\u003e0.56kg\u003c\/strong\u003e. This is an important consideration for ensuring your mount remains properly balanced after adding the reducer and camera to the optical train.\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\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.74x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Length\u003c\/td\u003e\n\u003ctd\u003e733.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduced Focal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Design\u003c\/td\u003e\n\u003ctd\u003eTriplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from the base of M48 male thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.56kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-end Thread\u003c\/td\u003e\n\u003ctd\u003eM72x1\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\/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":52851337429277,"sku":"ASK-ASKAR131FRD","price":419.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-131F-0-74-Reducer-1_efb7cdda-5cf2-46a8-a24c-8bb2c26ac7dd.jpg?v=1788401779"}],"url":"https:\/\/davidastro.com\/fr-us\/collections\/askar-field-flatteners-reducers-and-coma-correctors.oembed","provider":"David Astro","version":"1.0","type":"link"}