{"title":"Barlows et téléconvertisseurs","description":"\u003cdiv\u003e\n  \u003cp\u003e\n    A Barlow lens is the most efficient accessory in an eyepiece case: it doubles or triples the effective focal length of everything you own, turning three eyepieces into six useful magnifications. Extenders do the same for imaging, pushing image scale up for planetary work. David Astro carries Barlow lenses and extenders in Canada, in Canadian inventory and shipped domestically.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    Quality matters more here than in most accessories, because a Barlow amplifies every aberration in the optics ahead of it. Tell us your telescope and eyepieces and we will recommend accordingly.\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- more --\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eBarlows, Extenders and Effective Focal Ratio\u003c\/h2\u003e\n  \u003cp\u003e\n    A Barlow multiplies focal length, which also multiplies focal ratio and increases back-focus. All three effects matter, and the last one is often useful in its own right.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003e2x Barlows:\u003c\/strong\u003e The standard choice, doubling every eyepiece's magnification and effectively completing a small eyepiece set.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e3x and higher:\u003c\/strong\u003e For planetary and lunar imaging where image scale must match the camera's small pixels. Rarely useful visually given typical seeing.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTelecentric amplifiers:\u003c\/strong\u003e Maintain a parallel light cone rather than a diverging one, which matters for solar etalons and some binoviewer applications where the light angle affects performance.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFocal extenders for imaging:\u003c\/strong\u003e Designed for camera use with corrected fields, unlike visual Barlows which may not perform across a sensor.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAdded back-focus:\u003c\/strong\u003e A Barlow pushes the focal plane outward, which is often the cheapest way to make a binoviewer or a deep accessory reach focus.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eElement count and coating:\u003c\/strong\u003e Multi-element apochromatic Barlows preserve contrast far better than simple two-element designs, particularly in fast telescopes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eWhy Choose David Astro for Barlows and Extenders\u003c\/h2\u003e\n  \u003cp\u003e\n    A cheap Barlow in front of a good eyepiece wastes the eyepiece. We would rather you spent once.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSet planning:\u003c\/strong\u003e We help you choose a Barlow that fills the gaps in your eyepiece range rather than duplicating a focal length you already have.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSeeing realism:\u003c\/strong\u003e We will tell you when a 3x Barlow will exceed what your sky supports and simply give a larger, softer image.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBack-focus use:\u003c\/strong\u003e If your real problem is reaching focus with a binoviewer or deep accessory, we will point out that a Barlow may solve it directly.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAuthorized dealer:\u003c\/strong\u003e Genuine products with manufacturer warranty, in stock here and shipped without customs delays for Canadian buyers.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eShips from Canada:\u003c\/strong\u003e No duties or brokerage fees for Canadian orders.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eBarlow Lenses in Canada — Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003e\u003cstrong\u003eDoes a Barlow degrade the image?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eA good multi-element Barlow is very nearly invisible optically. A cheap two-element one adds noticeable chromatic aberration and reduced contrast, especially in fast telescopes.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003e2x or 3x?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003e2x for general use, since it produces magnifications you can actually use on most nights. 3x is mainly a planetary imaging tool, where sensor pixel size rather than the eye sets the requirement.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eWhat is a telecentric amplifier?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eAn amplifier that keeps the exit light cone parallel rather than diverging. This matters for solar etalons and some binoviewers, where a diverging cone shifts performance across the field.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eCan a Barlow help me reach focus?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eYes, frequently. It moves the focal plane outward, which is often the simplest solution when a binoviewer or a long accessory train will not come to focus in a refractor.\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eFilling gaps in your eyepiece set?\u003c\/h2\u003e\n  \u003cp\u003eTell us what you own and we will recommend the right amplification. Ships from Canada.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"celestron-luminos-2-5x-barlow-2","title":"Celestron Barlow Luminos 2.5x - 2\"","description":"\u003c!-- more --\u003e\u003ch2\u003eCaractéristiques\u003c\/h2\u003e\n\u003cul\u003e\n\n\u003cli\u003eLe Celestron 2,5x Luminos Barlow augmente le grossissement de n'importe quel oculaire de 2\" ou 1,25\" de deux fois et demie\u003c\/li\u003e\n\n\u003cli\u003eL'optique à 4 éléments de haute qualité produit un champ plat pour des images nettes sans couleur superflue\u003c\/li\u003e\n\n\u003cli\u003eLe corps en aluminium anodisé dur est fileté pour accepter des filtres de 2\"\u003c\/li\u003e\n\n\u003cli\u003eUn anneau de compression en laiton maintient les oculaires fermement en place et les grandes vis à oreilles sont faciles à tourner, même avec des gants\u003c\/li\u003e\n\n\u003cli\u003eUn adaptateur de 2\" à 1,25\" est inclus. Permet l'utilisation d'oculaires de 2\" et 1,25\".\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch2\u003eObjectif Celestron Luminos 2\" 2,5x Barlow\u003c\/h2\u003e\n\u003cp\u003e L'objectif Celestron 2\" Luminos Barlow augmente le grossissement de vos oculaires 2\" et 1,25\" de 2,5x. Les optiques apochromatiques premium à 4 éléments sont entièrement multicouches pour une transmission optimale de la lumière et produisent des images à contraste élevé et aux couleurs vraies.\u003c\/p\u003e \u003cp\u003eLe magnifique boîtier en aluminium anodisé dur est assorti aux oculaires de la gamme Celestron Luminos. Une poignée en caoutchouc centralisée aide à garder vos mains en toute sécurité sur le canon, même lorsque vos doigts sont froids ou que vous portez des gants. Un anneau de compression en laiton juste à l'intérieur du haut du Luminos 2,5x Barlow saisit vos oculaires de 2\" doucement mais fermement lorsque vous tournez la vis à oreilles surdimensionnée. Une fois la vis à oreilles fixée en place, l'anneau en laiton maintient votre oculaire dans le Barlow au lieu de compter sur la pointe de la vis à oreilles elle-même, offrant une meilleure prise en main et protégeant le canon des rayures. Un adaptateur correspondant de 2\" à 1,25\" est inclus afin que vous puissiez augmenter le grossissement de tous vos oculaires, à la fois 1,25\" et 2\", en cet objectif Barlow polyvalent.\u003c\/p\u003e\n\u003cp\u003e Le barillet d'insertion du Celestron Luminos 2.5x Barlow est fileté pour accepter des filtres de 2\". C'est une fonctionnalité intéressante, car vous pouvez changer d'oculaire sans retirer et remettre le filtre à chaque fois.\u003c\/p\u003e\n\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques \u003c\/p\u003e\n\n\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eGrossissement\u003c\/td\u003e\n\n\u003ctd\u003e2,5x\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eRevêtements optiques\u003c\/td\u003e\n\n\u003ctd\u003eEntièrement multicouche\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eLester\u003c\/td\u003e\n\n\u003ctd\u003e11 oz (312 g)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eTaille du baril\u003c\/td\u003e\n\n\u003ctd\u003e51mm (2\")\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eLongueur\u003c\/td\u003e\n\n\u003ctd\u003e93 mm (3,66\")\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eLargeur\u003c\/td\u003e\n\n\u003ctd\u003e64mm (2.52\")\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n \u003ctr\u003e\n\n\u003ctd\u003eFiltrer les discussions\u003c\/td\u003e\n\n\u003ctd\u003eOui\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eAdaptateur d'oculaire\u003c\/td\u003e\n\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eAnneaux de compression\u003c\/td\u003e\n\n\u003ctd\u003eOui sur les porte-oculaires 2\" et 1,25\"\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eOuverture claire\u003c\/td\u003e\n\n\u003ctd\u003e28mm (1.1\")\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967145668893,"sku":"CEL-93436","price":222.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Luminos-2-inch-2-5x-Barlow-Lens-93436-1__20128.1594230244.1280.1280.jpg?v=1684337148"},{"product_id":"celestron-omni-2x-barlow-1-25","title":"Celestron Barlow Omni 2x - 1.25\"","description":"\u003c!-- more --\u003e\u003ch2\u003eCaractéristiques\u003c\/h2\u003e\n\u003cul\u003e\n\n\u003cli\u003eDoublez le grossissement de chaque oculaire que vous possédez avec l'objectif Omni 2X Barlow\u003c\/li\u003e\n\n\u003cli\u003eGardez le dégagement oculaire de vos oculaires tout en obtenant 2 fois plus de puissance\u003c\/li\u003e\n\n\u003cli\u003eSe glisse dans les porte-oculaires et les diagonales de 1,25\" et accepte les oculaires de 1,25\" \u003c\/li\u003e\n\n\u003cli\u003eOptique entièrement multicouche avec bords noircis pour une bonne transmission de la lumière et un minimum de reflets\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch2\u003eObjectif Celestron Omni 1,25\" 2x Barlow\u003c\/h2\u003e\n\u003cp\u003e Une lentille Barlow est l'accessoire d'astronomie qui ne cesse de donner ! Insérez-le entre votre oculaire et votre télescope pour doubler instantanément le grossissement. Disons que vous avez deux oculaires dans votre étui à accessoires, un 10 mm et un 25 mm. Ajoutez un objectif Celestron Omni 2X Barlow au mélange, et vous avez maintenant le choix entre quatre grossissements. La combinaison de cet objectif avec le 25 mm offre un grossissement double, soit l'équivalent d'un oculaire de 12,5 mm, tandis que le 10 mm vous donne la puissance d'un oculaire de 5 mm.\u003c\/p\u003e \u003cp\u003eLe dégagement oculaire est la distance à laquelle votre œil doit se trouver par rapport à la première lentille de l'oculaire pour voir le champ de vision complet. Lorsque vous utilisez une lentille de Barlow avec un oculaire, vous obtenez un grossissement double, mais le dégagement oculaire n'est pas affecté. C'est une bonne chose, car normalement, plus la distance focale de l'oculaire est courte, moins vous avez de dégagement oculaire. En d'autres termes, un oculaire standard de 10 mm aura, en règle générale, un meilleur dégagement oculaire qu'un oculaire de 5 mm. Prime!\u003c\/p\u003e\n\u003cp\u003e Le Celestron Omni 2x Barlow est livré dans un élégant boîtier argenté. Les optiques à deux éléments sont entièrement multicouches et les bords des lentilles sont noircis pour réduire les reflets internes. Le barillet de 1,25\" s'adapte aux porte-oculaires et diagonales standard de 1,25\", et le Barlow accepte les oculaires de 1,25\". Une vis à oreilles en métal verrouille l'oculaire fermement en place.\u003c\/p\u003e\n\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\n\u003ctable\u003e\u003ctbody\u003e\u003ctr\u003e\n\n\u003ctd\u003eGrossissement\u003c\/td\u003e\n\n\u003ctd\u003e2x\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e \u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967145701661,"sku":"CEL-93326","price":58.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Omni-1-25-inch-2x-Barlow-Lens-93326-1__59078.1594230245.1280.1280.jpg?v=1684337150"},{"product_id":"celestron-x-cel-lx-2x-barlow-1-25","title":"Celestron Barlow X-Cel LX 2x - 1.25\"","description":"\u003c!-- more --\u003e\u003ch2\u003eCaractéristiques\u003c\/h2\u003e\n\u003cul\u003e\n\n\u003cli\u003eLa qualité X-Cel LX 2x Barlow double le grossissement de tout oculaire de 1,25\"\u003c\/li\u003e\n\n\u003cli\u003eLes optiques apochromatiques à 3 éléments entièrement multicouches offrent des images lumineuses et nettes\u003c\/li\u003e\n\n\u003cli\u003eUne poignée en caoutchouc aide à éviter les chutes accidentelles\u003c\/li\u003e\n\n\u003cli\u003eLe corps est fileté pour accepter les filtres standard de 1,25\"\u003c\/li\u003e\n\n\u003cli\u003eUn anneau de compression en laiton maintient l'oculaire fermement en place\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch2\u003eObjectif Celestron X-Cel LX 1,25\" 2x Barlow\u003c\/h2\u003e\n\u003cp\u003e Lorsqu'il est inséré entre l'oculaire et le télescope, cet objectif X-Cel 2X Barlow double le grossissement de tous vos oculaires de 1,25\". L'optique apochromatique haut de gamme produit des images nettes et à contraste élevé, pratiquement sans fausses couleurs.\u003c\/p\u003e \u003cp\u003eLe boîtier anodisé noir avec des reflets orange correspond aux oculaires de la gamme Celestron X-Cel LX. Une poignée en caoutchouc centralisée aide à garder vos mains en toute sécurité sur le canon, même lorsque vos doigts sont froids ou que vous portez des gants. Un anneau de compression en laiton juste à l'intérieur du haut du X-Cel Barlow saisit votre oculaire doucement mais fermement lorsque vous tournez la vis à oreilles. Une fois la vis moletée fixée en place, la bague en laiton maintient votre oculaire dans le Barlow au lieu de compter sur la pointe de la vis moletée elle-même, offrant une meilleure prise en main et protégeant le canon des rayures.\u003c\/p\u003e\n\u003cp\u003e Le canon du Celestron X-Cel LX 2x Barlow est fileté pour accepter des filtres de 1,25\", ce qui vous permet de changer d'oculaire sans retirer et rattacher le filtre de chaque canon d'oculaire.\u003c\/p\u003e\n\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eGrossissement\u003c\/td\u003e\n\n\u003ctd\u003e2x\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eRevêtements optiques\u003c\/td\u003e\n\n\u003ctd\u003eEntièrement multicouche\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967145734429,"sku":"CEL-93529","price":174.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-X-Cel-LX-1-25-inch-2x-Barlow-Lens-93529-1__13627.1594230245.1280.1280.jpg?v=1684337155"},{"product_id":"celestron-x-cel-lx-3x-barlow-1-25","title":"Celestron Barlow X-Cel LX 3x - 1.25\"","description":"\u003c!-- more --\u003e\u003ch2\u003e Caractéristiques\u003c\/h2\u003e\n\u003cul\u003e\n\n \u003cli\u003eLa qualité X-Cel LX 3x Barlow triple le grossissement de n'importe quel oculaire de 1,25\", parfait pour les propriétaires de télescopes rapides à courte distance focale\u003c\/li\u003e\n\n\u003cli\u003eLes optiques apochromatiques à 3 éléments entièrement multicouches offrent des images lumineuses et nettes avec une excellente correction des couleurs\u003c\/li\u003e\n\n\u003cli\u003eUne poignée en caoutchouc aide à éviter les chutes accidentelles\u003c\/li\u003e\n\n\u003cli\u003eLe corps est fileté pour accepter les filtres standard de 1,25\"\u003c\/li\u003e\n\n\u003cli\u003eUn anneau de compression en laiton maintient fermement l'oculaire en place\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch2\u003eObjectif Celestron X-Cel LX 1,25\" 3x Barlow\u003c\/h2\u003e\n\u003cp\u003e Lorsqu'il est inséré entre l'oculaire et le télescope, cet objectif Barlow 3x premium triple le grossissement de tous vos oculaires de 1,25\". C'est un accessoire parfait pour les propriétaires de télescopes courts et rapides, et est particulièrement utile pour augmenter le grossissement lors des observations lunaires ou planétaires sous bonnes conditions de vision L'optique apochromatique entièrement multicouche offre une excellente correction des couleurs et un excellent contraste.\u003c\/p\u003e \u003cp\u003eLe boîtier anodisé noir avec des reflets orange correspond aux oculaires de la gamme Celestron X-Cel LX. Une poignée en caoutchouc centralisée aide à garder vos mains en toute sécurité sur le canon, même lorsque vos doigts sont froids ou que vous portez des gants. Un anneau de compression en laiton juste à l'intérieur du haut du X-Cel Barlow saisit votre oculaire doucement mais fermement lorsque vous tournez la vis à oreilles. Une fois la vis moletée fixée en place, la bague en laiton maintient votre oculaire dans le Barlow au lieu de compter sur la pointe de la vis moletée elle-même, offrant une meilleure protection et protégeant le canon des rayures.\u003c\/p\u003e\n\u003cp\u003e Le canon du Celestron X-Cel LX 3X Barlow est fileté pour accepter des filtres de 1,25\", vous permettant de changer d'oculaire sans avoir à retirer et à rattacher le filtre de chaque canon d'oculaire.\u003c\/p\u003e\n\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eGrossissement\u003c\/td\u003e\n\n\u003ctd\u003e3x\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd\u003eRevêtements optiques\u003c\/td\u003e\n\n\u003ctd\u003eEntièrement multicouche\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967148880157,"sku":"CEL-93428","price":174.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-X-Cel-LX-1-25-inch-3x-Barlow-Lens-93428-1__27867.1594230261.1280.1280.jpg?v=1684337211"},{"product_id":"explore-scientific-2x-focal-extender-1-25","title":"Explore Scientific Barlow Télécentrique 2x - 1.25\"","description":"\u003c!-- more --\u003eUn bon prolongateur de focale ajoute une réelle polyvalence à la gamme d'accessoires de votre télescope. Tout d'abord, il vous permet d'augmenter le grossissement de n'importe quel oculaire avec la même taille de canon que vous possédez déjà. En d'autres termes, 3 oculaires offrent 6 choix de grossissement avec l'ajout d'un prolongateur de focale. Deuxièmement, la plupart du temps, les oculaires à faible grossissement ont un meilleur dégagement oculaire que les modèles à plus forte puissance. Lorsque vous utilisez un prolongateur de focale pour augmenter votre grossissement, vous profitez du dégagement oculaire généreux de l'oculaire de faible puissance, et c'est tout un bonus, en particulier pour les porteurs de lunettes ou pour ceux qui ont des télescopes rapides qui peuvent vraiment pousser des oculaires à fort grossissement. N'oubliez pas que nous fabriquons des prolongateurs de focale dans les modèles 2X, 3X et 5x, il y en a donc pour tous les styles de télescope.","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967198392605,"sku":"ES-FE02-125","price":167.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-1-25-inch-2x-Focal-Extender-FE02-125-1__57406.1594240336.1280.1280.jpg?v=1684338801"},{"product_id":"explore-scientific-3x-focal-extender-1-25","title":"Explore Scientific Barlow Télécentrique 3X - 1.25\"","description":"\u003c!-- more --\u003eUn bon prolongateur de focale ajoute une réelle polyvalence à la gamme d'accessoires de votre télescope. Tout d'abord, il vous permet d'augmenter le grossissement de n'importe quel oculaire avec la même taille de canon que vous possédez déjà. En d'autres termes, 3 oculaires offrent 6 choix de grossissement avec l'ajout d'un prolongateur de focale. Deuxièmement, la plupart du temps, les oculaires à faible grossissement ont un meilleur dégagement oculaire que les modèles à plus forte puissance. Lorsque vous utilisez un prolongateur de focale pour augmenter votre grossissement, vous profitez du dégagement oculaire généreux de l'oculaire de faible puissance, et c'est tout un bonus, en particulier pour les porteurs de lunettes ou pour ceux qui ont des télescopes rapides qui peuvent vraiment pousser des oculaires à fort grossissement. N'oubliez pas que nous fabriquons des prolongateurs de focale dans les modèles 2X, 3X et 5x, il y en a donc pour tous les styles de télescope.","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967198458141,"sku":"ES-FE03-125","price":195.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-1-25-inch-3X-Focal-Extender-FE03-125-1__93025.1594240336.1280.1280.jpg?v=1684338802"},{"product_id":"explore-scientific-5x-focal-extender-1-25","title":"Explore Scientific Barlow Télécentrique 5X - 1.25\"","description":"\u003c!-- more --\u003eUn bon prolongateur de focale ajoute une réelle polyvalence à la gamme d'accessoires de votre télescope. Tout d'abord, il vous permet d'augmenter le grossissement de n'importe quel oculaire avec la même taille de canon que vous possédez déjà. En d'autres termes, 3 oculaires offrent 6 choix de grossissement avec l'ajout d'un prolongateur de focale. Deuxièmement, la plupart du temps, les oculaires à faible grossissement ont un meilleur dégagement oculaire que les modèles à plus forte puissance. Lorsque vous utilisez un prolongateur de focale pour augmenter votre grossissement, vous profitez du dégagement oculaire généreux de l'oculaire de faible puissance, et c'est tout un bonus, en particulier pour les porteurs de lunettes ou pour ceux qui ont des télescopes rapides qui peuvent vraiment pousser des oculaires à fort grossissement. N'oubliez pas que nous fabriquons des prolongateurs de focale dans les modèles 2X, 3X et 5x, il y en a donc pour tous les styles de télescope.","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967198523677,"sku":"ES-FE05-125","price":181.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-1-25-inch-5X-Focal-Extender-FE05-125-1__66175.1594240337.1280.1280.jpg?v=1684338804"},{"product_id":"explore-scientific-2x-focal-extender-2","title":"Explore Scientific Barlow Télécentrique 2X - 2\"","description":"\u003c!-- more --\u003eLe prolongateur de focale Explore Scientific 2X (OD de 2,0 pouces) accepte les oculaires et les adaptateurs de caméra au format OD de 1,25 pouces et OD de 2,0 pouces. Entièrement revêtu d'EMD sur toutes les surfaces de lentilles air-air, avec tous les éléments de lentille noircis pour produire un contraste supérieur, cet extenseur focal ajoute une réelle polyvalence à votre gamme d'accessoires de télescope. Tout d'abord, il vous permet d'augmenter le grossissement de n'importe quel oculaire avec la même taille de canon que vous possédez déjà. En d'autres termes, 3 oculaires offrent 6 choix de grossissement avec l'ajout d'un prolongateur de focale. Deuxièmement, la plupart du temps, les oculaires à faible grossissement tels que les \u003ca href=\"https:\/\/explorescientificusa.com\/products\/30mm-82-degree-series-waterproof-eyepiece-epwp8230-01\" target=\"_blank\"\u003eoculaires étanches de la série 30 mm à 82 degrés\u003c\/a\u003e ont un meilleur dégagement oculaire que les modèles plus puissants. Lorsque vous utilisez un prolongateur de focale pour augmenter votre grossissement, vous profitez du dégagement oculaire généreux de l'oculaire de faible puissance, et c'est tout un bonus, en particulier pour les porteurs de lunettes ou pour ceux qui ont des télescopes rapides qui peuvent vraiment pousser des oculaires à fort grossissement. N'oubliez pas que nous fabriquons également des extensions focales OD de 1,25 pouce dans les modèles 2X, 3X et 5x, il y a donc quelque chose pour chaque style de télescope.","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967198589213,"sku":"ES-FE02-020","price":251.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-2-inch-2X-Focal-Extender-FE02-020-FE02-020-1__73557.1594240337.1280.1280.jpg?v=1684338671"},{"product_id":"explore-scientific-3x-focal-extender-2","title":"Explore Scientific Barlow Télécentrique 3X - 2\"","description":"\u003c!-- more --\u003eLe prolongateur de focale Explore Scientific 3X (OD de 2,0 pouces) accepte les oculaires et les adaptateurs de caméra au format OD de 1,25 pouces et OD de 2,0 pouces. Entièrement revêtu d'EMD sur toutes les surfaces de lentilles air-air, avec tous les éléments de lentille noircis pour produire un contraste supérieur, cet extenseur focal ajoute une réelle polyvalence à votre gamme d'accessoires de télescope. Tout d'abord, il vous permet d'augmenter le grossissement de n'importe quel oculaire avec la même taille de canon que vous possédez déjà. En d'autres termes, 3 oculaires offrent 6 choix de grossissement avec l'ajout d'un prolongateur de focale. Deuxièmement, la plupart du temps, les oculaires à faible grossissement tels que les \u003ca href=\"https:\/\/explorescientificusa.com\/products\/30mm-82-degree-series-waterproof-eyepiece-epwp8230-01\" target=\"_blank\"\u003eoculaires étanches de la série 30 mm à 82 degrés\u003c\/a\u003e ont un meilleur dégagement oculaire que les modèles plus puissants. Lorsque vous utilisez un prolongateur de focale pour augmenter votre grossissement, vous profitez du dégagement oculaire généreux de l'oculaire de faible puissance, et c'est tout un bonus, en particulier pour les porteurs de lunettes ou pour ceux qui ont des télescopes rapides qui peuvent vraiment pousser des oculaires à fort grossissement. N'oubliez pas que nous fabriquons également des extensions focales OD de 1,25 pouce dans les modèles 2X, 3X et 5x, il y a donc quelque chose pour chaque style de télescope.","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967198621981,"sku":"ES-FE03-020","price":251.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-2-inch-3X-Focal-Extender-FE03-020-FE03-020-1__19065.1594240337.1280.1280.jpg?v=1684338676"},{"product_id":"william-optics-2x-barlow-nosepiece-for-binoviewer","title":"William Optics Barlow 2x pour Tête Binoculaire","description":"\u003cul\u003e\n\n\u003cli\u003e\n\nLentille de Barlow à grossissement 2x spécialement conçue pour les visionneuses binoculaires\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n Augmente le grossissement tout en conservant la mise au point avec les configurations de visionneuse binoculaire \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 \nLe nez Barlow 2x William Optics pour Binoviewer est un accessoire optique spécialisé conçu pour améliorer la polyvalence et les performances des systèmes de visualisation binoculaire. Cette lentille Barlow double le grossissement de vos oculaires tout en assurant une mise au point appropriée lorsqu'elle est utilisée avec une configuration de visionneuse binoculaire. \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 jumelles William Optics. Peut ne pas être compatible avec d'autres marques sans modification.\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 Doté d'un verre optique et de revêtements de haute qualité, ce nez de Barlow 2x offre une excellente qualité d'image avec une aberration chromatique minimale. Il double efficacement le grossissement de vos oculaires sans sacrifier la clarté ou la luminosité. \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=\"William Optics 2x Nez Barlow pour Binoviewer\" src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/William-Optics-2x-Barlow-Nosepiece-for-Binoviewer-E-BINO-B2-1__77251.1596133233.1280.1280_832x832.jpg?v=1684339279\" 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 Conception et construction \n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cdiv class=\"two-columns-section\"\u003e\n\n\u003cdiv class=\"image-side-2\" data-mce-style=\"text-align: start;\" style=\"text-align: start;\"\u003e\n\n\u003cimg alt=\"William Optics 2x Nez Barlow pour Binoviewer\" src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/William-Optics-2x-Barlow-Nosepiece-for-Binoviewer-E-BINO-B2-1__77251.1596133233.1280.1280_832x832.jpg?v=1684339279\" 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 Conçu avec précision pour s'intégrer parfaitement aux jumelles William Optics. La construction durable garantit des performances durables et maintient un bon alignement optique même en cas d'utilisation fréquente.\n\u003c\/p\u003e \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\u003eCompatibilité:\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Spécialement conçu pour fonctionner avec les jumelles William Optics. Il se fixe directement sur le nez du binoviseur, garantissant un espacement et une mise au point appropriés. Bien qu'optimisé pour les produits William Optics, il peut être adaptable à certains autres systèmes de visionneuse binoculaire avec les modifications appropriées.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Amélioration du grossissement\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Double le grossissement de tout oculaire utilisé dans la configuration du binoviseur. Cela permet des vues plus détaillées des planètes, des caractéristiques lunaires et d'autres objets célestes sans avoir besoin de changer d'oculaire.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Entretien ciblé\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Conçu pour maintenir une bonne mise au point lorsqu'il est utilisé avec des visionneuses binoculaires. Ceci est crucial car les jumelles nécessitent souvent une longueur de trajet optique supplémentaire, ce que ce nez de Barlow s'adapte tout en offrant un grossissement accru.\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 \nAméliore la polyvalence de votre configuration de visionneuse binoculaire en doublant efficacement votre collection d'oculaires. Chaque oculaire peut désormais être utilisé à son grossissement natif et à une puissance 2x, élargissant ainsi vos options d'observation.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Facilité d'utilisation\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Conçu pour une installation et un retrait simples. Il se visse directement sur le nez du binoviseur, permettant des changements rapides entre la visualisation standard et agrandie pendant les séances d'observation.\n\u003c\/p\u003e\n\n\n\u003ch3\u003e\n\n Applications\n\n\u003c\/h3\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\n Idéal pour les observations détaillées des planètes, des caractéristiques lunaires, des étoiles doubles et d'autres objets bénéficiant d'un grossissement plus élevé. La vue binoculaire combinée à un grossissement accru peut révéler des détails subtils et offrir une expérience d'observation plus immersive.\n\u003c\/p\u003e\n\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967219331357,"sku":"WO-E-BINO-B2","price":81.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-2x-Barlow-Nosepiece-for-Binoviewer-E-BINO-B2-1__77251.1596133233.1280.1280.jpg?v=1684339279"},{"product_id":"baader-2-25x-q-barlow-1-25","title":"Baader 2.25x Q-Barlow - 1.25\"","description":"\u003c!-- more --\u003e\u003ch3\u003e Baader Planétarium Q-Barlow 2.25x \/ 1.3x\u003c\/h3\u003e \u003cp\u003eCette Barlow 2,25x de haute qualité en verres exotiques offre le rare facteur d'extension de 2,25x. Ainsi, il n'y a pas de longueurs focales en double lorsqu'il est utilisé avec les oculaires de l'ensemble Q-Turret, et vous pouvez obtenir un grossissement plus élevé qu'avec les objectifs barlow 2x standard si vous faites de la photographie planétaire avec une caméra Web ou vidéo, et vous pouvez faire un meilleur usage. de la résolution des caméras.\u003c\/p\u003e\n\u003cp\u003e Lisez ici le rapport détaillé de Dipl.-Ing W. Paech : Conseils + astuces pour la photographie lunaire et planétaire haute résolution avec un module vidéo - un court \"workflow\" pour les télescopes SC avec les accessoires Baader.\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003cdiv\u003e \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_Tabelle_ClassicOrtho_Okulare.pdf?v=1684340199?v=1585758499\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_hints_photography_240x240.jpg?v=1684340206?v=1585759569\" alt=\"\u0026gt;\u0026lt;\/a\u0026gt;\u0026lt;\/div\u0026gt;\u0026lt;p\u0026gt;\u0026lt;\/p\u0026gt;\u0026lt;div\u0026gt;\u0026lt;br\u0026gt;\u0026lt;\/div\u0026gt;\u0026lt;p\u0026gt;Le Barlow peut être vissé dans la tourelle d'oculaire Q-Turret ou combiné via l'adaptateur spécial inclus avec tout 1.25\" eyepieces. in this case it acts as a barlow. with the q-turret revolver and classic eyepieces results following focal lengths: mm\u003e\u003c\/a\u003e \u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_q_turret_closeup.jpg?v=1684340208?v=1585759618\"\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e\u003c\/div\u003e\n\n \u003cp\u003eAlternativement, il peut également être vissé directement dans un oculaire et augmente alors la distance focale du télescope d'un facteur de 1,3. L'élément Barlow a un filetage mâle M28.5 (correspondant au filetage du filtre des oculaires 1¼ \"), le boîtier a un filetage femelle M28.5.\u003cbr\u003e\u003c\/p\u003e\n\n\u003cdiv\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_q_barlow.jpg?v=1684340209?v=1585759598\"\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e\u003c\/div\u003e\n\n\u003ch4\u003eUtilisation sur un appareil photo planétaire\u003c\/h4\u003e\n\n\u003cp\u003eLa monture d'objectif nue de l'objectif Q-Barlow 2,25x (sans le porte-oculaire de 1,25\") peut être vissée dans chaque filetage de filtre de 1,25\". Pour ce faire, retirez les lentilles avec leur monture filetée du reste du boîtier. Sans la pince d'oculaire, le Barlow n'a plus un facteur d'extension de 2,25x, mais seulement de 1,3x (lorsqu'il est complètement vissé dans le filetage du filtre). La raison en est la distance plus courte entre les lentilles et le plan de l'image.\u003c\/p\u003e\n\n \u003cp\u003eIl se peut que vous ne puissiez pas insérer complètement la monture d'objectif dans le filetage du filtre, alors le facteur de grossissement est plus proche de 1,5x.\u003c\/p\u003e\n\n\u003cp\u003eMais si le nez de 1,25 \"d'un appareil photo fournit un filetage de filtre M28,5, vous pouvez généralement insérer complètement le Barlow, et en raison de la distance plus courte, le facteur fourni est d'environ 1,3x. Ceci est intentionnel et était l'un des objectifs. À 2,25x, un cercle d'image de 25 mm est fourni sans vignettage, tandis que le cercle d'image entièrement éclairé à 1,3x est de 13 mm.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967316521245,"sku":"BAA-2956185","price":81.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-2-25x-Q-Barlow-1-25-inch-1__12146.1597110675.1280.1280.jpg?v=1684340466"},{"product_id":"baader-hyperion-zoom-2-25x-barlow","title":"Baader Barlow Hyperion Zoom 2.25X","description":"\u003c!-- more --\u003e \u003cp\u003eLe Baader Hyperion Zoom Barlow se fixe rapidement à n'importe quel oculaire zoom Hyperion 8-24 mm Clickstop, le convertissant instantanément en un zoom 3,5-10,5 mm. La conception optique adaptée se traduit par une multiplication 2,25X pratiquement transparente, sans aucun compromis optique, donnant essentiellement une plage de zoom 7X avec des performances optiques exceptionnelles sur toute la plage 3,5-24 mm.\u003c\/p\u003e\n\u003ch3\u003e Points forts de l'objectif Hyperion Zoom Barlow\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003eOptiquement adapté pour des performances optiques parfaites avec le zoom Clickstop Hyperion 8-24 mm.\u003c\/li\u003e\n\n\u003cli\u003eConception de terrain plat anastigmatique.\u003c\/li\u003e\n\n\u003cli\u003eLentille triplet espacée d'air.\u003c\/li\u003e\n\n\u003cli\u003eBaader Phantom Group Coatings sur toutes les surfaces air-verre\u003c\/li\u003e\n\n\u003cli\u003eEntièrement déconcerté à l'intérieur et noirci pour éliminer les reflets de lumière parasite\u003c\/li\u003e\n\n\u003cli\u003ePermet une double configuration de barillet 2\"\/1¼\" avec tous les zooms Baader Hyperion Clickstop (MkI - MkIII)\u003c\/li\u003e\n\n \u003cli\u003eFiletage pour filtres standards 1¼\".\u003c\/li\u003e\n\n\u003cli\u003eConception modulaire.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003eExceptionnel en tant qu'optique de projection Visual Barlow et Flatfield à usage général\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003eComprend tous les adaptateurs nécessaires pour se coupler à n'importe quel filetage de filtre de 1¼\". Permet la fixation à pratiquement n'importe quel oculaire de 1¼\" pour une utilisation comme un barlow APO classique.\u003c\/li\u003e\n\n\u003cli\u003eComprend un adaptateur en T pour se coupler à n'importe quel composant fileté en T, caméra, tubes d'extension, diagonale, etc.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZoomBarlow_Uses1_Lg_480x480.jpg?v=1684340224?v=1586350869\" alt=\"Hyperion Zoom Barlow en tant qu'optique de projection de haute qualité et Barlow visuel standard\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003cb\u003eHyperion Zoom Barlow en tant qu'optique de projection de haute qualité et Barlow visuel standard\u003c\/b\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e L'Hyperion Barlow fonctionne parfaitement avec tous les appareils photo reflex numériques et CCD pour l'imagerie par projection. L'adaptateur T-2 inclus permet au Barlow d'être fixé et configuré avec pratiquement n'importe quel appareil photo, et est capable de couvrir des rapports de projection allant jusqu'à 5X grâce à l'utilisation de tubes d'extension (tels que notre système Astro T2). *\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZoomBarlowEyepiece1_Lg_480x480.jpg?v=1684340225?v=1586350961\" alt=\"Le Hyperion Zoom Barlow fait un superbe Barlow à grossissement variable ! (montré directement attaché à 1¼\" eyepiece filter threads with included adapter or t-2 prism diagonal via the threaded width=\"480x480\" height=\"480x480\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZoomBarlowPrism1_Lg_480x480.jpg?v=1684340227?v=1586350975\" alt=\"Le Hyperion Zoom Barlow fait un superbe Barlow à grossissement variable ! (montré directement attaché à 1¼\" eyepiece filter threads with included adapter or t-2 prism diagonal via the threaded width=\"480x480\" height=\"480x480\"\u003e\n\n\u003c\/div\u003e \u003cdiv\u003e\n\n\u003cp\u003e\u003cstrong\u003eLe Hyperion Zoom Barlow fait un superbe Barlow à grossissement variable !\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e(montré directement attaché à 1¼\"\u003cspan\u003e\u003c\/span\u003e filetages de filtre oculaire avec adaptateur inclus,\u003c\/p\u003e\n\n\u003cp\u003eou diagonale de prisme T-2 via l'adaptateur fileté T-2 inclus)\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e* Le rapport projection\/amplification peut être déterminé en mesurant depuis l'épaulement du filetage du filtre de l'ensemble objectif jusqu'au plan focal de l'appareil photo ou de l'oculaire. La distance focale de la barlow est d'environ 60 mm. Par exemple, un grossissement de 2X est obtenu lorsque la barlow est positionnée à 60 mm en avant du plan focal. À 120 mm, le grossissement est de 3X, et ainsi de suite (1X par 60 mm d'espacement). Lorsqu'il est utilisé avec l'adaptateur T-2 inclus et un reflex numérique (avec anneau en T, comme les nouveaux anneaux en T de protection DSLR Baader), le rapport de projection est d'environ 2,2X.\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e \u003cdiv\u003e\u003ca href=\"http:\/\/hyperionzoomlover.blogspot.com\/2011\/08\/baader-225x-barlow-hyperion-35-105mm.html\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eCliquez pour une revue informative et un blog sur le Baader Hyperion Zoom Barlow\u003c\/a\u003e\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967317111069,"sku":"BAA-2956180","price":194.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-Hyperion-Zoom-2-25X-Barlow-1__36871.1597110690.1280.1280.jpg?v=1684340489"},{"product_id":"baader-2x-vip-modular-barlow-1-25","title":"Baader Barlow Modulaire 2x VIP - 1.25\"","description":"\u003c!-- more --\u003e\u003cp\u003eLe Baader Planetarium VIP Modular Barlow est un système complet de barlow photo-visuel 2X de haute qualité. La barlow VIP (visuel et photographique) est ingénieusement conçue pour la fonctionnalité et la flexibilité. Il se compose de plusieurs composants modulaires, qui vous permettent de configurer la barlow pour de multiples utilisations visuelles et d'imagerie.\u003c\/p\u003e \u003cp\u003eConçu pour accepter des oculaires de 1¼\" et s'adapter à des porte-oculaires de 1¼\", il intègre également une section de 2\" pour une utilisation dans des porte-oculaires de 2\". Le porte-oculaire utilise deux vis de serrage nickelées pour un maximum de commodité et de sécurité, et intègre un anneau de verrouillage en bronze à ressort captif pour éviter toute possibilité d'endommager vos oculaires. Comme pour tous les produits Baader Planetarium, la qualité de l'usinage et le détail de la conception sont inégalés. Les surfaces internes sont toutes entièrement filetées en V et noircies pour éliminer les reflets de lumière parasites. Les surfaces sont finement usinées et satinées anodisées pour la fonction et l'apparence, et les pièces s'adaptent toutes étroitement et précisément.\u003c\/p\u003e \u003cp\u003eLe cœur de la barlow modulaire VIP est son assemblage de lentilles négatives à espacement d'air de précision. Le grand diamètre clair de 24 mm de l'optique minimise le vignettage et sa conception d'aplatissement de champ apochromatique le rend bien adapté à l'observation planétaire à haute puissance ainsi qu'aux caméras CCD. Les deux lentilles sont polies à un niveau très élevé et entièrement multicouches, en utilisant les meilleurs multicouches à 7 couches disponibles aujourd'hui (les réflexions par surface sont inférieures à 0,2 % !). Le résultat est une image nette et à contraste élevé qui n'est pratiquement pas affectée par son passage à travers la barlow.\u003c\/p\u003e\n\u003cp\u003e Pour plus d'informations sur cette barlow unique et ses utilisations potentielles, veuillez cliquer sur le lien Plus d'informations ci-dessous.\u003c\/p\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967324713245,"sku":"BAA-2406101","price":332.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-2x-VIP-Modular-Barlow-1-25-inch-1__19249.1597110761.1280.1280.jpg?v=1684340609"},{"product_id":"baader-carl-zeiss-2x-abbe-barlow-lens-1-25-w-clicklock","title":"Baader Barlow Abbe Carl Zeiss 2x - 1.25\" avec ClickLock","description":"\u003c!-- more --\u003e\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eDe nouveau disponible pour une durée limitée :\u003c\/strong\u003e objectif Carl Zeiss 1¼\" Abbe Barlow avec filetage T-2 fabriqué en Allemagne par Carl Zeiss à Iéna – avec pince oculaire 1¼\" \/ T-2 ClickLock de Baader Planetarium\u003c\/li\u003e\n\n\u003cli\u003eLentille de Barlow visuelle et projection d'oculaire photographique dans un seul système\u003c\/li\u003e\n\n\u003cli\u003eAdaptation directe T-2 possible - prolonge le grossissement jusqu'à 3x - sans perte de qualité\u003c\/li\u003e\n\n\u003cli\u003eLa qualité d'image n'est dépassée que par notre convertisseur FFC à champ plat 3x-8x, dans le cas où le facteur de projection dépasse 3x\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch2\u003eAdaptation directe T-2 possible - prolonge le grossissement jusqu'à 3x - sans perte de qualité\u003c\/h2\u003e \u003cp\u003eL'objectif Carl Zeiss Abbe Barlow se compose de deux parties. La section barlow avant se termine par un filetage photographique T-2 adapté pour se connecter directement sur les anneaux en T DSLR standard. , au niveau de séparation un fil photo T-2 - monté avec notre pince oculaire Baader ClickLock avec le système de serrage rotatif connu. Une adaptation directe T-2 est possible.\u003c\/p\u003e\n\u003cp\u003e Un agrandissement de l'échelle d'imagerie jusqu'à trois fois est possible sans perte de qualité. Sur le premier filetage T-2, vous pouvez connecter des anneaux en T normaux, de sorte que vous avez un objectif Barlow 2x - avec un barillet de 1¼ \" - devant chaque boîtier d'appareil photo, webcam ou appareil photo reflex numérique. Si vous ajoutez des extensions T-2, le grossissement peut \u003cstrong\u003eNous vous recommandons d'utiliser nos pinces T-2 Varilock pour un réglage en continu de la longueur optique :\u003c\/strong\u003e Varilock 20-29 mm (# 2956929) ou Varilock 29-46 mm (# 2956946)\u003c\/p\u003e\n\u003ch2\u003e Courbe de transmission spectrale du Zeiss Abbe Barlow\u003c\/h2\u003e \u003cp\u003eCe document (allemand) atteste des performances exceptionnelles du revêtement antireflet multicouche appliqué sur le nouvel objectif Carl Zeiss Abbe-Barlow 2016 fabriqué à Iéna \/ Allemagne. Carl Zeiss a choisi de développer et d'appliquer le meilleur revêtement jamais mis à la disposition de l'observateur visuel le plus exigeant. Les revêtements présentent une perte de 0,2 % sur la région spectrale exacte où l'œil humain adapté à la nuit est le plus sensible. Cette efficacité extrêmement élevée se traduit également par une dispersion de revêtement proche de zéro pour le contraste le plus élevé jamais vu. Aucun système d'objectif n'a jamais été revêtu d'exigences plus strictes pour l'observation visuelle et pour la photographie VIS.\u003c\/p\u003e\n\u003cp\u003e \u003ca title=\"Zeiss 2x Abbe Barlow: Reflexionsverlauf der Entspiegelungsschicht\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_zeiss_2x_abbe_barlow_reflexionsverlauf_der_entspiegelungsschicht.pdf?v=1684340375\" rel=\"346\"\u003e\u003cimg class=\"pdf-thumb\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_Zeiss_AR_2fach_Barlow_Baader_PL.pdf_thumb.jpg?v=1684340376\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\u003ctable\u003e \u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003eZeiss\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#)\u003c\/th\u003e\n\n\u003ctd\u003e1603321\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,103\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONNEXION EXTÉRIEURE (CÔTÉ LENTILLE)\u003c\/th\u003e\n\n\u003ctd\u003eCanon, 1¼\"\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONNEXION INTÉRIEURE (OCULAIRE\/CÔTÉ CAMÉRA)\u003c\/th\u003e\n\n\u003ctd\u003ePince, 1¼\"\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONNEXION EXTÉRIEURE (OCULAIRE\/CÔTÉ CAMÉRA)\u003c\/th\u003e\n\n\u003ctd\u003eFiletage, T-2 (M42 x 0,75)\u003c\/td\u003e\n\n \u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eSYSTÈME DE SERRAGE\u003c\/th\u003e\n\n\u003ctd\u003eVerrouillage des clics\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003e\u003cspan data-tooltip=\"Die Vergrößerung wird oft als die \"\u003eGROSSISSEMENT (X)\u003c\/span\u003e\u003c\/th\u003e\n\n\u003ctd\u003e2x - 3x\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eTAILLE DU CANON (PO)\u003c\/th\u003e\n\n\u003ctd\u003e1¼\"\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONCEPTION OPTIQUE\u003c\/th\u003e\n\n\u003ctd\u003eBarlow\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr class=\"last odd\"\u003e\n\n\u003cth\u003eSPÉCIALITÉ\u003c\/th\u003e\n\n\u003ctd\u003eLentille de Barlow\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967326384413,"sku":"BAA-1603321","price":695.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"baader-telecentric-system-tz-2-2x","title":"Baader Système Télécentrique TZ-2 - 2x","description":"\u003c!-- more --\u003e \u003cul\u003e\n\n\u003cli\u003eTélécentrique avec un diamètre extérieur de 2\" et des filetages T-2 des deux côtés\u003c\/li\u003e\n\n\u003cli\u003eAplanatique, avec extension de focale 2x pour obtenir un faisceau f\/30 parallèle en conjonction avec des systèmes optiques ~f\/7,5 - sans courbure de champ\u003c\/li\u003e\n\n\u003cli\u003eConçu spécifiquement pour H-alpha à 656,3 nm, offrant 99 % de Strehl (99 % de luminosité de définition)\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003eSystèmes télécentriques Baader pour l'extension de la distance focale\u003c\/h3\u003e\n\u003ch4\u003e pour fournir un faisceau optique parallèle et pour fournir un backfocus suffisant, en conjonction avec n'importe quel filtre SolarSpectrum H-alpha\u003c\/h4\u003e \u003cp\u003eLes ensembles optiques télécentriques sont souvent confondus avec une lentille de Barlow. Les deux peuvent être utilisés pour augmenter la distance focale. Les systèmes télécentriques sont conçus pour que la pupille de sortie soit apparemment positionnée à l'infini, ce qui signifie que le rayon central de n'importe quel point du champ semble provenir de l'infini et est donc perpendiculaire au plan de l'image et parallèle à l'axe optique. Cela signifie que le faisceau hors axe arrive au plan image avec la même géométrie angulaire que les rayons axiaux. Tous les éléments de champ semblent être sur l'axe, à travers le plan de l'image et - contrairement à une lentille de Barlow - les rayons de champ de bord ne sont pas des faisceaux inclinés.\u003c\/p\u003e \u003cp\u003eParce que tous les rayons principaux à travers le plan image sont perpendiculaires au plan image, les rayons au bord du champ passeront par un étalon juste devant le plan focal avec exactement la même géométrie que les rayons sur l'axe. Ainsi, dans un agencement optique télécentrique f\/30, l'étalon voit exactement la même géométrie sur tout le champ, et la bande passante spectrale ne change pas de longueur d'onde sur tout le champ de vision.\u003c\/p\u003e\n\u003cp\u003e À partir d'un rapport d'ouverture de ~f\/15 (+2x télécentrique), ~f\/10 (+3x télécentrique) ou ~f\/7,5 (+4x télécentrique), les systèmes Baader TZ créeront un faisceau parallèle avec ~f\/ 30 rapport d'ouverture. Dans le cas de distances focales de télescope largement déviantes, l'ouverture d'objectif claire du télescope doit être réduite en diamètre au point que le rapport f\/ruit final est à nouveau proche de f\/30 (nous proposons un diaphragme à iris approprié pour cela but).\u003c\/p\u003e \u003cp\u003eLa distance de travail du système TZ au capteur de la caméra - lorsqu'elle est mesurée à partir de leur objectif arrière - va de 200 mm pour le TZ-2 à 230 mm pour le TZ-4 - à 250 mm pour le TZ-3. Cela offre suffisamment de place pour le boîtier du filtre H-alpha et la plupart des accessoires, par exemple une diagonale de miroir Baader 2\" ou tout autre appareil photo imaginable. Tous les revêtements TZ sont adaptés aux différents substrats de verre d'objectif et optimisés pour un débit maximal à 656 nm .\u003c\/p\u003e\n\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003ePlanétarium Baader\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#)\u003c\/th\u003e\n\n\u003ctd\u003e2459255\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCODE EAN\u003c\/th\u003e\n\n\u003ctd\u003e4047825008701\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n \u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,356\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eEXTENSION DE LA LONGUEUR FOCALE\u003c\/th\u003e\n\n\u003ctd\u003e2-fach\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUSAGE\u003c\/th\u003e\n\n\u003ctd\u003epour l'observation H-alpha avec les filtres SolarSpectrum\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONNEXION INTÉRIEURE (CÔTÉ LENTILLE)\u003c\/th\u003e\n\n\u003ctd\u003eFiletage, T-2 (M42 x 0,75)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONNEXION EXTÉRIEURE (OCULAIRE\/CÔTÉ CAMÉRA)\u003c\/th\u003e\n\n\u003ctd\u003eFiletage, T-2 (M42 x 0,75)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\u003cdiv class=\"moretab\" data-title=\"Downloads \u0026amp; Support\"\u003e\n\n \u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_baader_telecentric_systems_tzs_for_h_solar_filters.pdf?v=1684341062?v=1590568855\" target=\"_blank\"\u003eBaader Telecentric Systems (TZS) pour filtres solaires H-α\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_baader_m68_tele_compendium_telescope_connector_for_solarspectrum_baader_ffc_and_telecentric_systems.pdf?v=1684340407?v=1590568479\" target=\"_blank\"\u003eBaader M68 Tele-Compendium | Connecteur télescopique pour SolarSpectrum, Baader FFC et systèmes télécentriques\u003c\/a\u003e\u003c\/p\u003e\n\n\n\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967382155549,"sku":"BAA-2459255","price":657.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Telecentric-System-TZ-2-2x-1__36823.1597111120.1280.1280.jpg?v=1684341743"},{"product_id":"baader-telecentric-system-tz-3-3x-research-grade","title":"Baader Système Télécentrique TZ-3 - 3x Research Grade","description":"\u003c!-- more --\u003e\u003ch5\u003eSystèmes télécentriques Baader pour l'extension de la distance focale pour fournir un faisceau optique parallèle et pour fournir un backfocus suffisant, en conjonction avec n'importe quel filtre SolarSpectrum H-alpha\u003c\/h5\u003e \u003cp\u003eLes ensembles optiques télécentriques sont souvent confondus avec une lentille de Barlow. Les deux peuvent être utilisés pour augmenter la distance focale. Les systèmes télécentriques sont conçus pour que la pupille de sortie soit apparemment positionnée à l'infini, ce qui signifie que le rayon central de n'importe quel point du champ semble provenir de l'infini et est donc perpendiculaire au plan de l'image et parallèle à l'axe optique. Cela signifie que le faisceau hors axe arrive au plan image avec la même géométrie angulaire que les rayons axiaux. Tous les éléments de champ semblent être sur l'axe, à travers le plan de l'image et - contrairement à une lentille de Barlow - les rayons de champ de bord ne sont pas des faisceaux inclinés.\u003c\/p\u003e \u003cp\u003eParce que tous les rayons principaux à travers le plan image sont perpendiculaires au plan image, les rayons au bord du champ passeront par un étalon juste devant le plan focal avec exactement la même géométrie que les rayons sur l'axe. Ainsi, dans un agencement optique télécentrique f\/30, l'étalon voit exactement la même géométrie claire sur tout le champ, et la bande passante spectrale ne change pas de longueur d'onde sur tout le champ de vision.\u003c\/p\u003e\n\u003cp\u003e À partir d'un rapport d'ouverture de ~f\/15 (+2x télécentrique), ~f\/10 (+3x télécentrique) ou ~f\/7,5 (+4x télécentrique), les systèmes Baader TZ créeront un faisceau parallèle avec ~f\/ 30 rapport d'ouverture. Dans le cas de distances focales de télescope largement déviantes, l'ouverture claire de l'objectif du télescope doit être réduite en diamètre au point que le rapport f\/ruit final est à nouveau proche de f\/30 (nous proposons un diaphragme à iris approprié à cet effet , ou l'utilisateur peut construire son propre diaphragme).\u003c\/p\u003e \u003cp\u003eLes distances de travail du système TZ - lorsqu'elles sont mesurées à partir de leur objectif arrière - vont de 200 mm pour le TZ-2 à 230 mm pour le TZ-4 - à 250 mm pour le TZ-3. Cela offre suffisamment de place pour le boîtier du filtre H-alpha et la plupart des accessoires, par exemple une diagonale en étoile Baader 2 \", une visionneuse binoculaire ou tout autre appareil photo imaginable. L'espace généreux du TZ-3 pourra également accueillir une visionneuse binoculaire lorsqu'il est monté sur le corps SolarSpectrum au moyen d'une diagonale en étoile Baader BBHS T-2.Tous les revêtements TZ sont adaptés aux différents substrats de verre de lentille et optimisés pour un débit maximal à 656 nm.Le TZ-3 fonctionne également pour CaK à 396 nm. nm Le rapport Strehl TZ-3 est bien supérieur à 80 % à 396 nm\u003c\/p\u003e\n\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003ePlanétarium Baader\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#) \u003c\/th\u003e\n\n\u003ctd\u003e2459257\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCODE EAN\u003c\/th\u003e\n\n\u003ctd\u003e4047825008695\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,37\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eEXTENSION DE LA LONGUEUR FOCALE\u003c\/th\u003e\n\n\u003ctd\u003e3x\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUSAGE\u003c\/th\u003e\n\n\u003ctd\u003epour l'observation H-alpha avec les filtres SolarSpectrum\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONNEXION INTÉRIEURE (CÔTÉ LENTILLE)\u003c\/th\u003e\n\n\u003ctd\u003eFiletage, T-2 (M42 x 0,75), 2\" (50,8mm)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n \u003cth\u003eCONNEXION EXTÉRIEURE (CÔTÉ LENTILLE)\u003c\/th\u003e\n\n\u003ctd\u003eFiletage, 2\" (50,8mm)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONNEXION EXTÉRIEURE (OCULAIRE\/CÔTÉ CAMÉRA)\u003c\/th\u003e\n\n\u003ctd\u003eFiletage, T-2 (M42 x 0,75), 2\" (50,8mm)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\u003cdiv class=\"moretab\" data-title=\"Downloads \u0026amp; Support\"\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_baader_telecentric_systems_tzs_for_h_solar_filters.pdf?v=1684341062?v=1590568855\" target=\"_blank\"\u003eBaader Telecentric Systems (TZS) pour filtres solaires H-α\u003c\/a\u003e\u003c\/p\u003e\n\n \u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_baader_m68_tele_compendium_telescope_connector_for_solarspectrum_baader_ffc_and_telecentric_systems.pdf?v=1684340407?v=1590568479\" target=\"_blank\"\u003eBaader M68 Tele-Compendium | Connecteur télescopique pour SolarSpectrum, Baader FFC et systèmes télécentriques\u003c\/a\u003e\u003c\/p\u003e\n\n\n\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967382188317,"sku":"BAA-2459257","price":648.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Telecentric-System-TZ-3-3x-Research-Grade-1__65124.1597111122.1280.1280.jpg?v=1684341500"},{"product_id":"baader-telecentric-system-tz-4-4x","title":"Baader Système Télécentrique TZ-4 - 4x","description":"\u003c!-- more --\u003e\u003cul\u003e\n\n\u003cli\u003eTélécentrique avec un diamètre extérieur de 2\" et des filetages T-2 des deux côtés\u003c\/li\u003e\n\n\u003cli\u003eAplanatique, avec extension de focale 4x pour obtenir un faisceau f\/30 parallèle en conjonction avec des systèmes optiques ~f\/7,5 - sans courbure de champ\u003c\/li\u003e\n\n\u003cli\u003eConçu spécifiquement pour H-alpha à 656,3 nm, offrant 99 % de Strehl (99 % de luminosité de définition)\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003eSystèmes télécentriques Baader pour l'extension de la distance focale\u003c\/h3\u003e\n\u003ch4\u003e pour fournir un faisceau optique parallèle et pour fournir un backfocus suffisant, en conjonction avec n'importe quel filtre H-alpha SolarSpectrum\u003c\/h4\u003e \u003cp\u003eLes ensembles optiques télécentriques sont souvent confondus avec une lentille de Barlow. Les deux peuvent être utilisés pour augmenter la distance focale. Les systèmes télécentriques sont conçus pour que la pupille de sortie soit apparemment positionnée à l'infini, ce qui signifie que le rayon central de n'importe quel point du champ semble provenir de l'infini et est donc perpendiculaire au plan de l'image et parallèle à l'axe optique. Cela signifie que le faisceau hors axe arrive au plan image avec la même géométrie angulaire que les rayons axiaux. Tous les éléments de champ semblent être sur l'axe, à travers le plan de l'image et - contrairement à une lentille de Barlow - les rayons de champ de bord ne sont pas des faisceaux inclinés.\u003c\/p\u003e \u003cp\u003eParce que tous les rayons principaux à travers le plan image sont perpendiculaires au plan image, les rayons au bord du champ passeront par un étalon juste devant le plan focal avec exactement la même géométrie que les rayons sur l'axe. Ainsi, dans un agencement optique télécentrique f\/30, l'étalon voit exactement la même géométrie claire sur tout le champ, et la bande passante spectrale ne change pas de longueur d'onde sur tout le champ de vision.\u003c\/p\u003e\n\u003cp\u003e À partir d'un rapport d'ouverture de ~f\/15 (+2x télécentrique), ~f\/10 (+3x télécentrique) ou ~f\/7,5 (+4x télécentrique), les systèmes Baader TZ créeront un faisceau parallèle avec ~f\/ 30 rapport d'ouverture. Dans le cas de distances focales de télescope largement déviantes, l'ouverture claire de l'objectif du télescope doit être réduite en diamètre au point que le rapport f\/ruit final est à nouveau proche de f\/30 (nous proposons un diaphragme à iris approprié pour cela but).\u003c\/p\u003e \u003cp\u003eLes distances du système TZ au capteur de la caméra - lorsqu'elles sont mesurées à partir de leur objectif arrière - vont de 200 mm pour le TZ-2 à 230 mm pour le TZ-4 - à 250 mm pour le TZ-3. Cela offre suffisamment de place pour le boîtier du filtre H-alpha et la plupart des accessoires, par exemple une diagonale de miroir Baader 2\" ou tout autre appareil photo imaginable. Tous les revêtements TZ sont adaptés aux différents substrats de verre d'objectif et optimisés pour un débit maximal à 656 nm .\u003c\/p\u003e\n\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eFABRICANT\u003c\/th\u003e\n\n\u003ctd\u003ePlanétarium Baader\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUGS (#)\u003c\/th\u003e\n\n\u003ctd\u003e2459256\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCODE EAN\u003c\/th\u003e\n\n\u003ctd\u003e4047825008695\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n \u003ctr\u003e\n\n\u003cth\u003ePOIDS (KG)\u003c\/th\u003e\n\n\u003ctd\u003e0,37\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eEXTENSION DE LA LONGUEUR FOCALE\u003c\/th\u003e\n\n\u003ctd\u003e4-fach\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eUSAGE\u003c\/th\u003e\n\n\u003ctd\u003eVerwendbar für H-alpha Beobachtung mit SolarSpectrum Filtern\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONNEXION INTÉRIEURE (CÔTÉ LENTILLE)\u003c\/th\u003e\n\n\u003ctd\u003eFiletage, T-2 (M42 x 0,75)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONNEXION EXTÉRIEURE (CÔTÉ LENTILLE)\u003c\/th\u003e\n\n\u003ctd\u003eCanon, 2\" (50,8mm)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003cth\u003eCONNEXION EXTÉRIEURE (OCULAIRE\/CÔTÉ CAMÉRA)\u003c\/th\u003e\n\n\u003ctd\u003eFiletage, T-2 (M42 x 0,75) \u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\u003cdiv class=\"moretab\" data-title=\"Downloads \u0026amp; Support\"\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_baader_telecentric_systems_tzs_for_h_solar_filters.pdf?v=1684341062?v=1590568855\" target=\"_blank\"\u003eBaader Telecentric Systems (TZS) pour filtres solaires H-α\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_baader_m68_tele_compendium_telescope_connector_for_solarspectrum_baader_ffc_and_telecentric_systems.pdf?v=1684340407?v=1590568479\" target=\"_blank\"\u003eBaader M68 Tele-Compendium | Connecteur télescopique pour SolarSpectrum, Baader FFC et systèmes télécentriques\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\n\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967382253853,"sku":"BAA-2459256","price":657.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Telecentric-System-TZ-4-4x-1__98750.1597111122.1280.1280.jpg?v=1684341504"},{"product_id":"apm-1-5x-2x-2-7x-ed-barlow-lens-2","title":"APM Barlow ED 1.5x\/2x\/2.7x - 2\"","description":"\u003c!-- more --\u003e \u003cp\u003eIl s'agit de l'équivalent 2\" de notre célèbre objectif Barlow 1,25\", 2x\/1,5x. Il est bien fait à la fois dans la conception et l'artisanat. Les deux lentilles sont entièrement multicouches pour un contraste et une transmission optimaux. Les objectifs ont un diamètre de 37 mm, vous pouvez donc même utiliser des oculaires grand angle de 2\" sans vignettage.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003e \u003cstrong\u003eAutres utilisations :\u003c\/strong\u003e\n\u003c\/h4\u003e\n\u003cp\u003e Avec un tube d'extension de 2\" - 50 mm - vous obtiendrez un grossissement de 2,7x par rapport à un oculaire sans lentille de Barlow. De cette façon, vous transformez un oculaire grand angle de 30 mm en un oculaire grand angle de 11 mm avec un dégagement oculaire confortable.\u003cbr\u003e\u003cbr\u003e Retirez la cellule de lentille anodisée noire de la lentille de Barlow et vissez-la directement dans votre oculaire pour atteindre un grossissement de 1,5x.\u003cbr\u003e\u003cbr\u003e \u003cstrong\u003eLa livraison contient :\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eÉlément Barlow avec tube de 2\"\u003c\/li\u003e\n\n\u003cli\u003eCache-poussière\u003c\/li\u003e\n\n\u003cli\u003eEmballage\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv data-custom-tab=\"\"\u003e\n\n\u003cp data-custom-tab-title=\"\"\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n \u003cdiv\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eConnexion à l'oculaire :\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e2\" et 1 1\/4\"\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eConnexion au télescope :\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e2\"\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eSerrage :\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cdiv\u003ePince en laiton\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eEnrobage:\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eEntièrement multicouche\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eMatériau du boîtier :\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eAluminium\u003cbr\u003e\n \u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eLentilles :\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e2 lentilles\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eLester:\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eCalifornie. 10,5 onces.\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967664648477,"sku":"APM-Barlow2","price":134.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-Barlow2__74932.1620931648.1280.1280.jpg?v=1684345464"},{"product_id":"apm-coma-correcting-ed-2-7x-6-25x-double-barlow-1-25","title":"APM Barlow Double\/Correcteur de Coma ED 2.7x\/6.25x - 1.25\"","description":"\u003c!-- more --\u003e\u003cspan\u003eAPM Comacorrecting 1 1\/4\" ED Double Barlow 6.25 x\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e \u003cspan\u003eConçu par Gerd Düring \/ Allemagne\u003c\/span\u003e\u003cbr\u003e \u003cbr\u003e\u003ci\u003e\u003c\/i\u003e\u003cspan\u003e\u003c\/span\u003eNotre Barlow photo-visuel apochromatique 2,7x unique au monde avec un véritable verre ED, calculé pour la correction du coma hors axe des télescopes newtoniens, peut maintenant être combiné avec un deuxième Barlow APM 2,7x à une distance spécifique pour augmenter le facteur de grossissement à 6,25 X. Inutile de préciser que la correction de coma est conservée ainsi que le flat field corrigé.\u003cbr\u003e\u003cbr\u003e À elle seule, une seule cellule de lentille de Barlow a un facteur de grossissement de 2,7x et fournira un champ d'imagerie entièrement éclairé de 26 mm à un foyer arrière de 104,1 mm (mesuré à partir de l'épaulement de la cellule de lentille). Il est optimisé pour les télescopes de type Newton F\/4 et lorsqu'il est utilisé avec de tels télescopes, il offre également une correction du coma. Ceci est particulièrement utile pour les utilisateurs manuels Alt-Az Dobsonian qui peuvent profiter d'une vue sans coma des objets lorsqu'ils dérivent dans le champ de vision.\u003cbr\u003e \u003cbr\u003ePour utiliser la barlow dans une configuration 6,25x, ajoutez simplement une deuxième cellule de lentille 2,7x à l'autre extrémité de l'extension afin qu'il y ait une lentille à chaque extrémité. Cette configuration donne un champ corrigé de 14 mm à une distance de 83,1 mm de l'épaulement de la cellule de l'objectif (84 mm du centre du dernier élément).\u003cbr\u003e\u003cbr\u003e Le double Barlow permet un grossissement très élevé avec des télescopes newtoniens pour l'imagerie planétaire tout en conservant un rapport F respectablement bas nécessaire pour des fréquences d'images élevées. Réglez simplement le capteur de votre appareil photo à 83,1 mm de l'épaulement de la dernière cellule d'objectif pour obtenir la bonne mise au point arrière pour l'imagerie.\u003cbr\u003e\u003cbr\u003e La conception de chaque élément Barlow suit les principes habituels d'APM d'une qualité optique exceptionnelle. Il comporte un groupe de lentilles doubles utilisant le verre ED chinois FK61 (similaire à Ohara FPL51). Les lentilles sont collées et appliquées des deux côtés avec un multicouche à large bande avec une transmission de plus de 99 % pour une longueur d'onde de 400 nm à 700 nm.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e \u003cspan\u003eContenu de la livraison\u003c\/span\u003e\u003cbr\u003e\u003cul\u003e\n\n \u003cli\u003eDeux éléments ED-Barlow de 1 1\/4\" avec filetage Fiterthread de 28,4 mm\u003c\/li\u003e\n\n\u003cli\u003eRallonge 1 1\/4\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eEnrobage:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eMulticouche à large bande\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eMatériau du boîtier :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eGrossissement:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e6.25\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eLentilles :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e2 x 2 lentilles\u003cbr\u003e\n \u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eConception optique :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eDoublet cimenté\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eFil de connexion :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eFiletage de filtre M 28,4 mm des deux côtés\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eBackfocus :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e84 mm (du centre du dernier élément)\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eFait pour Faite pour sert pour sert à:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eTélescopes newtoniens (optimisés pour f\/4)\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\n\u003cb\u003eChamp entièrement corrigé :\u003c\/b\u003e \u003c\/div\u003e\n\n\u003cdiv\u003e14 millimètres\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eChamp entièrement éclairé :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e14 millimètres\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967664714013,"sku":"APM-Komakorr-DoubleBarlow","price":414.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-Coma-Correcting-ED-2-7x-6-25x-Double-Barlow-1-25-inch-1__30560.1600124040.1280.1280.jpg?v=1684345471"},{"product_id":"apm-coma-correcting-ed-2-7x-barlow-1-25","title":"APM Barlow\/Correcteur de Coma ED 2.7x - 1.25\"","description":"\u003c!-- more --\u003e\u003cspan\u003eAPM Correction de coma 1 1\/4\" ED Barlow 2,7 x\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e \u003cspan\u003eConçu par Gerd Düring \/ Allemagne\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e Notre tout nouveau Barlow apochromatique photo-visuel avec du vrai verre ED, calculé pour la correction du coma hors axe des télescopes newtoniens. Ce Barlow vous permet d'observer les planètes et les objets du ciel profond au bord du champ de vision de 1,25 \"avec la même qualité que sur l'axe. L'utilisateur Dobson en particulier en profitera car la plupart du temps, les objets ne sont pas exactement centrés sur l'axe.\u003cbr\u003e\u003cbr\u003e Le champ photographique corrigé du coma est parfait pour APS-C. En raison de sa qualité unique, cette barlow peut également être utilisée avec des réfracteurs, SC, etc. avec une qualité d'image qu'aucune autre Barlow n'atteindra, égale à son prix.\u003cbr\u003e\u003cbr\u003e En raison des discussions du Forum poussées, Gerd Düring en Allemagne a conçu cette nouvelle lentille de Barlow ED à correction de coma améliorée, optimisée pour les miroirs paraboliques avec f-ratio f\/4.\u003cbr\u003e \u003cbr\u003eCe Barlow \u003cspan\u003e\u003cspan\u003ecorrecteur de coma\u003c\/span\u003e\u003c\/span\u003e utilise comme élément ED le verre ED chinois FK61 (similaire à Ohara FPL51), les lentilles sont cimentées souples et appliquées des deux côtés avec un multicouche à large bande avec une transmission de plus de 99 % pour une longueur d'onde de 400 nm à 700 nm.\u003cbr\u003e\u003cbr\u003e Le backfocus optimal est à 105 mm du centre du dernier objectif. La distance focale de la barlow est de - 62,9 mm, le diaphragme de 22 mm.\u003cbr\u003e\u003cbr\u003e\u003cdiv\u003e Cette barlow \u003cspan\u003e\u003cspan\u003ecorrectrice de coma\u003c\/span\u003e\u003c\/span\u003e offre avec son ouverture de 22 mm en mise au point secondaire un champ photo-visuel éclairé à 100 % pour APS-C lorsqu'elle est utilisée avec un backfocus de 105 mm.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003cspan\u003e\u003cspan\u003eCe Barlow correcteur de coma fonctionne avec une distance de mise au point de 105 comme un correcteur de chemin de verre optique parfait avec correction de coma intégrée et permet ainsi l'utilisation d'approches binoculaires normales sur des télescopes à foyer arrière court, comme d'habitude avec les télescopes Newton \/ Dobson.\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/div\u003e \u003cbr\u003eL'adaptateur en 2 parties est photo-visuel optimisé, visuel avec le backfocus optimal de 105 mm avec le nouveau APM-Deluxe Centering Brass-Clamp. Cet adaptateur supérieur de luxe a une longueur de 55 mm et peut être dévissé, que vous obtenez un filetage photographique T2 (M42 x 0,75 mm) pour une utilisation avec DSLR avec anneau adaptateur T2.\u003cbr\u003e\u003cbr\u003e \u003ci\u003eLes premiers résultats avec l'ED-Barlow ont été incroyables !\u003c\/i\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e \u003cspan\u003eLa livraison contient :\u003c\/span\u003e\u003cbr\u003e\u003cul\u003e\n\n\u003cli\u003eÉlément ED-Barlow 1 1\/4\"\u003c\/li\u003e\n\n\u003cli\u003eAdaptateur en 2 parties\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eConnexion à la caméra :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eFiletage T2\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eConnexion à l'oculaire :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e1 1\/4\"\u003cbr\u003e\n \u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eConnexion au télescope :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e1 1\/4\" et 2\"\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eSerrage :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003ePince en laiton\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003echemin mécanique :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eCalifornie. 120 millimètres\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eEnrobage:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eMulticouche à large bande\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eMatériau du boîtier :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eAluminium\u003cbr\u003e\n \u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eDiamètre libre :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e22 millimètres\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eGrossissement:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e2,7x\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eLentilles :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e2 lentilles\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eConception optique :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eDoublet cimenté\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eFait pour Faite pour sert pour sert à:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eTélescopes newtoniens (optimisés pour f\/4) \u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eChamp entièrement éclairé :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eminimum 30mm\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eDistance focale résultante :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e- 62,9mm\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eLester:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eCalifornie. 7 onces\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967664746781,"sku":"APM-Komakorr-Barlow","price":265.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/APM-Coma-Correcting-ED-2-7x-Barlow-1-25-inch-1__69183.1600124040.1280.1280.jpg?v=1684345473"},{"product_id":"apm-adapter-kit-for-2-7x-ed-barlow","title":"APM Kit d'Adaptation pour Barlow ED 2.7x","description":"\u003c!-- more --\u003e\u003cb\u003eKit d'adaptation APM en 2 parties pour élément de barlow corrigé en coma 2,7x - utilisation photographique et visuelle\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e \u003ci\u003eAdaptateur vers T2 et Adaptateur vers 1,25\"\u003c\/i\u003e\u003cbr\u003e\u003cbr\u003e \u003cb\u003eL'élément Barlow n'est pas inclus\u003c\/b\u003e\u003cbr\u003e \u003cbr\u003eL'adaptateur en 2 parties est photo-visuel optimisé, visuel avec le backfocus optimal de 105 mm avec le nouveau APM-Deluxe Centering Brass-Clamp. Cet adaptateur supérieur de luxe a une longueur de 55 mm et peut être dévissé, que vous obtenez un filetage photographique T2 (M42 x 0,75 mm) pour une utilisation avec DSLR avec anneau adaptateur T2.\u003cbr\u003e\u003cbr\u003e \u003cu\u003e\u003cb\u003eContenu de la livraison :\u003c\/b\u003e\u003c\/u\u003e\u003cbr\u003e\u003cbr\u003e\u003cul\u003e\n\n\u003cli\u003eAdaptateur vers T2 (M42x0,75) - distance parfaite pour DSLR et T-Ring (55mm)\u003c\/li\u003e\n\n\u003cli\u003eAdaptateur vers 1,25\" pour une utilisation visuelle\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967664812317,"sku":"APM-BAdap","price":98.0,"currency_code":"CAD","in_stock":false}]},{"product_id":"apm-coma-correcting-2-7x-barlow-element-1-25","title":"APM Élément de Barlow Correcteur de Coma 2.7x - 1.25\"","description":"\u003c!-- more --\u003e\u003cspan\u003eAPM Comacorrection 1 1\/4\" ED Barlow Element 2.7 x\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e \u003cspan\u003eConçu par Gerd Düring \/ Allemagne\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e Notre tout nouveau Barlow apochromatique photo-visuel avec du vrai verre ED, calculé pour la correction du coma hors axe des télescopes newtoniens. Ce Barlow vous permet d'observer les planètes et les objets du ciel profond au bord du champ de vision de 1,25 \"avec la même qualité que sur l'axe. L'utilisateur Dobson en particulier en profitera car la plupart du temps, les objets ne sont pas exactement centrés sur l'axe.\u003cbr\u003e\u003cbr\u003e Le champ photographique corrigé du coma est parfait pour APS-C. En raison de sa qualité unique, cette barlow peut également être utilisée avec des réfracteurs, SC, etc. avec une qualité d'image qu'aucune autre Barlow n'atteindra, égale à son prix.\u003cbr\u003e\u003cbr\u003e En raison des discussions du Forum poussées, Gerd Düring en Allemagne a conçu cette nouvelle lentille de Barlow ED à correction de coma améliorée, optimisée pour les miroirs paraboliques avec f-ratio f\/4.\u003cbr\u003e \u003cbr\u003eCe Barlow utilise comme élément ED le verre ED chinois FK61 (similaire à Ohara FPL51), les lentilles sont cimentées tendres et appliquées des deux côtés avec un multicouche à large bande avec une transmission de plus de 99 % pour une longueur d'onde de 400 nm à 700 nm.\u003cbr\u003e\u003cbr\u003e Le backfocus optimal est à 105 mm du centre du dernier objectif. La distance focale de la barlow est de - 62,9 mm, le diaphragme de 22 mm.\u003cbr\u003e\u003cbr\u003e Cette barlow offre avec son ouverture de 22 mm en mise au point secondaire un champ photo-visuel éclairé à 100 % pour l'APS-C lorsqu'elle est utilisée avec un backfocus de 105 mm.\u003cbr\u003e\u003cbr\u003e \u003ci\u003eLes premiers résultats avec l'ED-Barlow ont été incroyables !\u003c\/i\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e \u003cspan\u003eLa livraison contient :\u003c\/span\u003e\u003cbr\u003e\u003cul\u003e\u003cli\u003e Élément ED-Barlow 1 1\/4\" avec filetage Fiterthread de 28,4 mm\u003cbr\u003e\n\n\u003c\/li\u003e\u003c\/ul\u003e\n\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003echemin mécanique :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e18,5 mm\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n \u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eEnrobage:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eMulticouche à large bande\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eMatériau du boîtier :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eDiamètre libre :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e22 millimètres\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eGrossissement:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e2,7x\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eLentilles :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e2 lentilles\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n \u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eConception optique :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eDoublet cimenté\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eFil de connexion :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eFiletage de filtre M 28,4 mm des deux côtés\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eBackfocus :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e105 mm du centre de la dernière lentille\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eFait pour Faite pour sert pour sert à:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eTélescopes newtoniens (optimisés pour f\/4)\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eChamp entièrement éclairé :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eminimum 30mm\u003cbr\u003e\n \u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eDistance focale résultante :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e- 62,9mm\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eLester:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eCalifornie. 2 oz.\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967664845085,"sku":"APM-Komakorr-Barlowelement","price":175.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-Coma-Correcting-2-7x-Barlow-Element-1-25-inch-1__16422.1600124041.1280.1280.jpg?v=1684345441"},{"product_id":"apm-coma-correcting-telecentric-1-5x-barlow-2","title":"APM Barlow Télécentrique\/Correcteur de Coma 1.5x - 2\"","description":"\u003c!-- more --\u003e\u003cb\u003eAPM 2 pouces corrigeant le coma télécentrique 1,5x Barlow\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e \u003ci\u003epar le célèbre physicien et opticien Philipp Keller\u003c\/i\u003e\u003cbr\u003e\u003cbr\u003e Il y a quelques temps, APM Telescopes a présenté le Barlow 2,7 fois correcteur de coma conçu par Gerd Düring, qui jouit d'une grande popularité.\u003cbr\u003e\u003cbr\u003e \u003cb\u003eNouveau design\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e Lorsque nos clients ont demandé une version de 2 pouces avec un facteur de grossissement plus petit, les télescopes APM ont laissé le célèbre physicien et concepteur optique Philipp Keller calculer un nouveau 1,5 x Barlow.\u003cbr\u003e \u003cbr\u003eToutes les connaissances actuelles ont été intégrées pour optimiser la conception optique. La conception télécentrique évite que la distance doive être ajustée individuellement pour chaque oculaire. Insérez simplement l'oculaire dans le manchon adaptateur de 2 pouces en option et obtenez automatiquement la distance optimale.\u003cbr\u003e\u003cbr\u003e \u003cb\u003eGrand Backfocus\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e Comme déjà pour le Barlow de G. Düring, la conception a été calculée pour donner un grand foyer arrière, afin qu'il puisse être utilisé comme correcteur optique de chemin de verre avec effet de correction de coma combiné avec des jumelles.\u003cbr\u003e Le grand foyer arrière permet l'utilisation d'un guide + filtre + CCD hors axe pour prendre des photos avec des puces plein format.\u003cbr\u003e\u003cbr\u003e \u003cb\u003eDétails techniques\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\n\u003cli\u003egrossissement 1,5 x\u003c\/li\u003e\n\n\u003cli\u003ecorrection du coma\u003c\/li\u003e\n\n\u003cli\u003eFiletage mâle M54 x 0,75 et filetage femelle M48 x 0,75 (côté oculaire\/CCD)\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003econception télécentrique avec 4 lentilles\u003c\/li\u003e\n\n \u003cli\u003efonctionne comme correcteur de chemin optique 1,5 x pour bino-viewers\u003c\/li\u003e\n\n\u003cli\u003egrand champ d'imagerie pour les puces plein format\u003c\/li\u003e\n\n\u003cli\u003eCercle d'image 100 % illuminé : 30 mm de diamètre\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003edécalage de mise au point vers l'extérieur : 96 mm\u003c\/li\u003e\n\n\u003cli\u003eExtrémité de distance Filetage M54 pour mise au point 95 mm\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cb\u003e\u003cbr\u003eContenu de la livraison\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\u003cli\u003e Telecentric Barlow comprend un adaptateur d'oculaire de 2 \"\u003cbr\u003e\n\n\u003c\/li\u003e\u003c\/ul\u003e\n\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\n\u003cp data-custom-tab-title\u003eCaractéristiques\u003c\/p\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eEnrobage:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eEntièrement multicouche\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eFil de filtre :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e2\"\u003cbr\u003e\n\n\u003c\/div\u003e\n\n \u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eGrossissement:\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e1.5\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eConception optique :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e2 lentilles achromatiques\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eFil de connexion :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003eFiletage extérieur M54 et filetage intérieur M48\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eBackfocus :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e105 mm (à partir du centre de la dernière lentille)\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eChamp entièrement corrigé :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e44 millimètres \u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cb\u003eChamp entièrement éclairé :\u003c\/b\u003e\u003c\/div\u003e\n\n\u003cdiv\u003e30 millimètres\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cbr\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967665107229,"sku":"APM-Komakorr-Barlow2","price":704.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/APM-Coma-Correcting-Telecentric-1-5x-Barlow-2-inch-1__15232.1600124041.1280.1280.jpg?v=1684345446"},{"product_id":"tele-vue-2x-powermate-2-inch","title":"Tele Vue 2x Powermate - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 2x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 2\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-element Telecentric Amplifier\u003c\/li\u003e\n\u003cli\u003eCoatings: Fully Multi-Coated\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (48mm \/ 2\")\u003c\/li\u003e\n\u003cli\u003eWeight: 1.20 lbs (544g)\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\u003eManual\/Software\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\u003eBeyond the Barlow: High-Fidelity Planetary Amplification\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 2x Powermate - 2\" is not a Barlow lens; it is a sophisticated 4-element telecentric amplifier designed to increase your telescope's magnification without the optical compromises inherent in traditional designs. This 2-inch model is the definitive choice for observers and imagers who require high-power views of the Moon and planets, delivering images that retain the full fidelity of the primary optics. It is engineered to be a transparent addition to your optical train, preserving sharpness, contrast, and field geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Powermate's Telecentric Optical Advantage\u003c\/h3\u003e\n\u003cp\u003eA standard Barlow lens works by diverging the light cone from your telescope's objective, which moves the exit pupil and can introduce spherical aberration, especially in fast telescopes. The Tele Vue Powermate's 4-element design corrects for this. It recaptures the diverging rays and re-collimates them, keeping the exit pupil in its original location and ensuring the light rays exit parallel to the optical axis.\u003c\/p\u003e\n\u003cp\u003eThis telecentric correction is what sets the Powermate apart. It means your eyepieces can operate as if they are looking directly at the telescope's objective, preserving their designed performance characteristics. The result is a uniformly sharp field, free of the edge-of-field astigmatism and color fringing that can soften views through a simple Barlow.\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\u003eFidelity Through High-Transmission Coatings\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the 2x Powermate is fully multi-coated with Tele Vue's proprietary index-matched coatings. This meticulous process minimizes light loss from reflection and maximizes transmission across the visual spectrum. The practical benefit is a brighter, higher-contrast image than what typical Barlows can provide.\u003c\/p\u003e\n\u003cp\u003eOn a target like Jupiter, this translates to more subtle detail in the cloud bands and a more distinct Great Red Spot. The improved contrast makes it easier to discern low-contrast features, such as festoons and ovals, against the planet's bright disk. There is no false color or \"ghosting,\" just the pure signal from your telescope, amplified.\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 Secure, Non-Marring Mechanical Interface\u003c\/h3\u003e\n\u003cp\u003eThe Powermate's mechanical construction is as robust as its optical design. The 2-inch barrel is machined from solid aluminum and features a chromed sleeve that resists wear and slides smoothly into your focuser. A captive brass clamp ring, tightened by a single oversized thumbscrew, provides a secure grip on your eyepieces or camera nosepiece.\u003c\/p\u003e\n\u003cp\u003eThis design prevents the common problem of marred barrels caused by simple set screws. It also ensures a perfectly centered alignment of the eyepiece with the Powermate's optics, which is critical for maintaining optical performance at high magnifications. This solid, repeatable connection gives you confidence that your expensive eyepieces and cameras are held safely.\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\u003eIntegrated 2-Inch Filter Threads\u003c\/h3\u003e\n\u003cp\u003eFor planetary observers, filters are essential tools for enhancing specific details. The 2x Powermate's barrel is threaded to accept standard 48mm (2-inch) filters. This allows you to attach a Moon filter, a color filter for enhancing planetary features, or even a light pollution filter directly to the Powermate.\u003c\/p\u003e\n\u003cp\u003ePlacing the filter before the eyepiece and Powermate optics is often preferable, as it minimizes any potential reflections that could occur between the filter and the eyepiece's field lens. It also simplifies your workflow, allowing you to leave a commonly used filter attached to the Powermate and switch eyepieces without having to re-thread the filter each time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe View from the Cassini Division\u003c\/h3\u003e\n\u003cp\u003eImagine your 10-inch SCT is aimed at Saturn on a night of steady seeing. With a 24mm wide-field eyepiece, you get a pleasing 83x view, but the rings are just a bright, flat oval. You insert the 2x Powermate, and the magnification jumps to 166x. The planet swells to fill more of the field, and the image remains perfectly sharp.\u003c\/p\u003e\n\u003cp\u003eThe first thing you notice is the clean, dark gap of the Cassini Division, now resolved as a distinct black line tracing the circumference of the rings. The subtle shading of the Crepe Ring inside the main rings becomes visible. With a moment of steady air, you can even pick out the faint banding on Saturn's globe itself. This is the Powermate's function: it delivers the magnification needed for fine detail without degrading the image your telescope worked so hard to 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\u003eEngineered for High-Resolution Imaging\u003c\/h3\u003e\n\u003cp\u003eThe Powermate's telecentric design makes it an ideal amplifier for imaging. Because it produces parallel light rays, it is much more forgiving of camera sensor placement than a Barlow. This makes it a perfect match for planetary cameras, webcams, and DSLRs used in \"eyepiece projection\" mode.\u003c\/p\u003e\n\u003cp\u003eWith the optional Tele Vue PMT-2200 T-Ring Adapter, you can connect your camera body directly to the Powermate for a secure, threaded connection. This solid imaging train is essential for high-resolution lunar and planetary photography, eliminating the potential for flexure and ensuring your sensor remains perfectly orthogonal to the optical axis.\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\u003ePowermate vs. Barlow: A Critical Distinction\u003c\/h3\u003e\n\u003cp\u003eChoosing the right magnification tool depends on your equipment and goals. The 2-inch 2x Powermate occupies a specific performance niche.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue 2x BIG Barlow:\u003c\/strong\u003e The BIG Barlow is an excellent visual accessory that provides a more affordable path to 2x amplification. However, the Powermate's telecentric correction provides a distinct advantage for imagers and for visual use in very fast (f\/4-f\/5) telescopes, where it better controls aberrations and maintains eyepiece performance. For critical planetary work, the Powermate is the superior optical tool.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue 4x Powermate:\u003c\/strong\u003e The 4x Powermate is a specialized tool for nights of exceptional seeing or for imagers using large pixels who need to achieve a specific image scale. The 2x Powermate is far more versatile, providing a magnification boost that is usable on average nights with a wider range of telescopes and eyepieces. The 2x is the workhorse of the Powermate family.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe primary trade-off for the Powermate's optical performance is its size, weight, and cost compared to a standard Barlow. At 1.20 lbs, it requires a robust focuser and may necessitate re-balancing your telescope. However, for those who refuse to compromise on image quality, this is a trade-off that delivers a clear, visible return at the eyepiece.\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\"\u003eIs the Powermate really better than a good Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most visual use, the difference can be subtle, but for imaging and use with fast telescopes (f\/5 or lower), the Powermate's telecentric design provides a flatter, sharper field by not moving the exit pupil. It maintains the performance of your eyepieces more faithfully than a Barlow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 2\" Powermate with 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2\" 2x Powermate comes with a 1.25\" adapter that fits in its eyepiece end. This allows you to use your 1.25\" eyepieces while taking advantage of the Powermate's optical quality.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 2x Powermate work for deep-sky observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for high-power planetary viewing, it can be used to increase magnification on smaller deep-sky objects like planetary nebulae (e.g., the Ring Nebula, M57) or to split tight double stars. However, it will dim the image, as any magnification increase does.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a camera to the 2x Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need the Tele Vue PMT-2200 T-Ring Adapter. This accessory threads onto the top of the Powermate, providing standard T-threads for connecting a DSLR-specific T-ring or a planetary imaging camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 2\" Powermate heavy? Will my focuser handle it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 2\" 2x Powermate weighs 1.20 lbs (544g). While most modern 2-inch Crayford or rack-and-pinion focusers can handle the weight, it is a significant load. Ensure your focuser's tension is properly adjusted to prevent slipping, and be prepared to re-balance your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel #\u003c\/td\u003e\n\u003ctd\u003ePMT-2200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-element telecentric amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e48mm (for 2\" filters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.20 lbs \/ 544 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e4.8\" \/ 122 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Barrel Diameter\u003c\/td\u003e\n\u003ctd\u003e2.7\" \/ 68.6 mm\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\"\u003eTele Vue 2x Powermate - 2\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Eyepiece Adapter\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\"\u003eTop 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\"\u003eBottom 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\/Tele_Vue_2x_Powermate_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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223879844125,"sku":"TV-PMT-2200","price":543.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2x_Powermate_2in_1.jpg?v=1777515018"},{"product_id":"tele-vue-2-5x-powermate-1-25-inch","title":"Tele Vue 2.5x Powermate - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification: 2.5x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-Element Pupillary Corrector\u003c\/li\u003e\n\u003cli\u003eCompatibility: Visual and Photographic Use\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (1.25\")\u003c\/li\u003e\n\u003cli\u003eWeight: 0.45 lbs (204 g)\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\u003eManual\/Software\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\u003eMore Than a Barlow: The Tele Vue 2.5x Powermate\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 2.5x Powermate is a compact, professional-grade 1.25\" magnification amplifier designed to increase the power of your eyepieces and imaging cameras without the optical compromises of a standard Barlow lens. It uses a proprietary 4-element design to deliver sharp, high-contrast, and color-correct views, making it an essential tool for high-resolution planetary, lunar, and solar observation and imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Powermate's 4-Element Pupillary Corrector Design\u003c\/h3\u003e\n\u003cp\u003eUnlike a simple Barlow lens which moves the exit pupil and can introduce aberrations, the Tele Vue Powermate employs a sophisticated four-element optical system. This design functions as a pupillary corrector, keeping the exit pupil of your eyepiece in its natural position. The result is a view that is sharp across the entire field, free from the vignetting and edge-of-field astigmatism that can affect complex, wide-field eyepieces when used with a standard Barlow.\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\u003eFully Multi-Coated Optics for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the 2.5x Powermate receives Tele Vue's stringent multi-layer anti-reflection coatings. This meticulous process ensures maximum light transmission, minimizing internal reflections and ghosting. For the observer, this translates directly into higher contrast at the eyepiece, revealing subtle surface details on Jupiter's cloud bands or delicate rilles on the Moon that might otherwise be lost to scattered light.\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\u003eConstant Magnification and Preserved Eye Relief\u003c\/h3\u003e\n\u003cp\u003eA key advantage of the Powermate design is its consistent performance. The 2.5x magnification factor remains constant regardless of the eyepiece used, and it does not significantly shorten the eye relief of your favorite long-eye-relief eyepieces. This means you can enjoy the comfort of your Delos or Panoptic eyepieces while operating at higher power, a significant benefit for eyeglass wearers or anyone who dislikes crowding the eyepiece.\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\u003eTelecentric Performance for Specialized Filters\u003c\/h3\u003e\n\u003cp\u003eThe Powermate's optical system is telecentric, meaning it outputs light rays that are parallel to the optical axis. This is a critical feature for users of highly sensitive solar filters, particularly Hydrogen-alpha etalons, which require parallel light for their interference filters to function correctly. Using a Powermate ensures the filter's bandpass is not shifted, delivering a uniform, high-contrast solar image across the entire field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA High-Performance Photographic Amplifier\u003c\/h3\u003e\n\u003cp\u003eFor planetary imagers, the 2.5x Powermate acts as a high-performance telephoto lens for your camera sensor. It produces a flatter field than a typical Barlow, ensuring sharpness from the center to the edge of the chip. This is the tool you reach for when your telescope's native focal length isn't long enough to achieve the critical image scale needed to resolve craterlets near the lunar terminator or capture the Cassini Division in Saturn's rings with a high-speed planetary camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVersatile Mechanical and Threaded Design\u003c\/h3\u003e\n\u003cp\u003eThe Powermate is built for flexibility in the field. The 1.25\" barrel is threaded to accept standard 1.25\" filters, allowing you to add a moon filter or planetary color filter without unscrewing your eyepiece. For imagers, the top of the Powermate is threaded to accept the Tele Vue PTR-1250 T-Ring adapter, enabling a secure, direct connection to a DSLR or dedicated astronomy camera for a rigid 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\u003eThe Right Tool for High-Magnification Observing\u003c\/h3\u003e\n\u003cp\u003eImagine your 8\" SCT on a night of steady seeing, with Jupiter well-placed. A 10mm eyepiece yields 200x, but the atmosphere can support more. Inserting the 2.5x Powermate brings the magnification to 500x. As your eye settles, the image snaps into focus. You can now clearly distinguish multiple belts and zones, trace the intricate festoons within them, and watch the tiny, sharp disks of the Galilean moons transit the planet's face. This is the jump in performance the Powermate is designed to deliver.\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 Note on Limitations and System Matching\u003c\/h3\u003e\n\u003cp\u003eWhile optically powerful, the 2.5x Powermate adds weight and length to the optical train. On smaller mounts or telescopes with limited back-focus, achieving balance can be a consideration. Furthermore, its high magnification factor demands good atmospheric seeing; on turbulent nights, the Powermate will amplify the turbulence just as effectively as it amplifies the target. It is a high-performance tool that rewards patience and steady skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Tele Vue Magnification Amplifier\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several tools for increasing magnification, each with a specific purpose. Understanding the trade-offs helps you choose the right one for your observing style.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5x Powermate vs. 2x Barlow:\u003c\/strong\u003e The standard 2x Barlow is an excellent, compact choice for general-purpose visual use. The 2.5x Powermate is the superior option when using premium, wide-field eyepieces, for imaging, or with specialized solar filters due to its advanced 4-element, telecentric design that better controls aberrations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5x Powermate vs. 5x Powermate:\u003c\/strong\u003e The 2.5x is the versatile, all-around choice for most telescopes and seeing conditions. The 5x Powermate is a specialist's tool, designed primarily for high-resolution planetary imaging with large-aperture telescopes on nights of exceptional atmospheric stability. For most visual observers, the 5x model provides more magnification than conditions will typically allow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a Powermate better than a Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most applications, yes. The Powermate's 4-element design corrects for aberrations that Barlows can introduce, especially with wide-field eyepieces. It also keeps light rays parallel, which is critical for use with Hydrogen-alpha solar filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 2.5x Powermate for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The 2.5x Powermate is an excellent choice for high-resolution lunar and planetary imaging. It creates a flat, sharp field and provides the image scale needed for small sensors to capture fine detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 2.5x Powermate work with my Nagler or Ethos eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is an ideal match. The Powermate's pupillary-correcting design means it will not introduce the aberrations or vignetting that can occur when using complex, wide-field eyepieces with a standard Barlow lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapter do I need to connect a camera to the 2.5x Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need the Tele Vue PTR-1250 T-Ring Adapter. This adapter threads directly onto the top of the Powermate, and you then attach the appropriate T-Ring for your specific camera brand (e.g., Canon EOS, Nikon F).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Powermate work in a 2\" focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can use the 1.25\" Powermate in a 2\" focuser with a standard 2\" to 1.25\" adapter. However, it is designed for use with 1.25\" eyepieces and accessories.\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\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eTV-PMT-2513\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2.5x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-element, pupillary-correcting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e1.25\" (M28.5 x 0.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.45 lbs \/ 7.2 oz \/ 204 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e3.1\" \/ 79 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Barrel Diameter\u003c\/td\u003e\n\u003ctd\u003e1.6\" \/ 41 mm\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\"\u003eTele Vue 2.5x Powermate - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cap (Top)\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\"\u003e1.25\" Dust Cap (Bottom)\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\/Tele_Vue_2.5x_Powermate_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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223879876893,"sku":"TV-PMT-2513","price":364.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2.5x_Powermate_1.25in_1.jpg?v=1777515017"},{"product_id":"tele-vue-4x-powermate-2-inch","title":"Tele Vue 4x Powermate - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 4x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 2\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-Element Pupillary Corrector\u003c\/li\u003e\n\u003cli\u003eCompatibility: 2\" and 1.25\" Eyepieces (with adapter)\u003c\/li\u003e\n\u003cli\u003ePrimary Use: High-Magnification Visual and Imaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eReach Deeper with the Tele Vue 4x Powermate\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eTele Vue 4x Powermate - 2\"\u003c\/strong\u003e is a professional-grade magnification amplifier, engineered to quadruple the power of your eyepieces or imaging camera without the optical compromises of a standard Barlow lens. It is the definitive choice for serious planetary observers and imagers seeking the highest levels of magnification while preserving the optical integrity of their telescope system. This is not just a Barlow; it is a sophisticated, four-element optical system designed for uncompromising performance.\u003c\/p\u003e\n\u003cp\u003eFor observers with fast Dobsonian reflectors or Schmidt-Cassegrains, the 4x Powermate delivers the extreme focal lengths necessary to resolve fine details on Jupiter's cloud belts, Cassini's Division in Saturn's rings, and subtle albedo features on Mars. It allows you to use your comfortable, long eye relief, low-power eyepieces for high-power observing, transforming them into planetary performers. The result is a level of magnification that is sharp, bright, and free of the aberrations that can plague simpler amplifier designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Powermate Optical Concept\u003c\/h3\u003e\n\u003cp\u003eUnlike a conventional Barlow lens, which diverges light rays, the Tele Vue 4x Powermate features a four-element, pupillary-correcting design. This sophisticated system re-collimates the light exiting the Powermate, making the rays parallel to the optical axis. This telecentric output is the key to its superior performance, especially with modern, wide-field eyepieces.\u003c\/p\u003e\n\u003cp\u003eThe practical benefit is that the Powermate does not alter the eyepiece's intended eye relief or introduce spherical aberration to the exit pupil. Your long eye relief 2\" eyepiece remains comfortable to use, and the field remains sharp from edge to edge. This is a critical distinction that sets the Powermate in a class of its own for high-power visual use.\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\u003eTelecentric Performance for Imaging and Solar\u003c\/h3\u003e\n\u003cp\u003eThe telecentric output of the 4x Powermate is a significant advantage for specialized applications. For hydrogen-alpha solar observing with etalon-based filters, this parallel light path is essential. It ensures the filter's bandpass remains consistent across the entire field of view, preventing off-axis hot-spotting and delivering a uniform, high-contrast solar disk.\u003c\/p\u003e\n\u003cp\u003eFor planetary imagers, the telecentric design means the magnification factor remains constant regardless of the camera's distance from the top of the Powermate. This consistency simplifies achieving the correct image scale for optimal sampling with your specific camera sensor. It effectively turns your telescope into a longer focal ratio instrument without introducing the optical compromises of a traditional Barlow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHigh-Transmission Multi-Coated Optics\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the 4x Powermate receives Tele Vue's proprietary multi-layer coatings. These advanced coatings are optimized for high transmission across the visual spectrum, ensuring that the magnified image is as bright and high-contrast as possible. This is not a system that dims the view; it simply enlarges it.\u003c\/p\u003e\n\u003cp\u003eMaximizing light throughput is critical when working at the high magnifications this unit provides. By minimizing reflections and internal scattering, the Powermate delivers a clean, crisp image with a dark background. This allows you to push your telescope to its theoretical limits on nights of good seeing, teasing out faint planetary details that would otherwise be lost in glare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure, Non-Marring Connections\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eTele Vue 4x Powermate - 2\"\u003c\/strong\u003e is built for heavy-duty use with large 2\" eyepieces and imaging equipment. The chromed 2\" barrel provides a durable, smooth surface that slides easily into your focuser and resists wear. A captive setscrew ensures you cannot accidentally drop the screw in the dark.\u003c\/p\u003e\n\u003cp\u003eInside the eyepiece holder, a soft brass clamp ring provides a secure grip on your accessories without marring their barrels. Unlike a simple thumbscrew that digs into the barrel, this compression ring distributes pressure evenly, protecting your investment in premium eyepieces and cameras while ensuring a perfectly centered optical alignment.\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 High-Power Planetary Imaging Lens\u003c\/h3\u003e\n\u003cp\u003eThe optical section of the 4x Powermate can be unthreaded from its 2\" barrel, revealing a male thread. With the addition of a PMT-4201 T-Ring Adapter, you can connect a DSLR or astronomical camera directly to the Powermate optics. This converts the unit into a high-quality 4x teleconverter for planetary, lunar, or solar imaging.\u003c\/p\u003e\n\u003cp\u003eImagine using an 8\" SCT at its native 2000mm focal length. The 4x Powermate transforms it into an 8000mm (f\/40) planetary imaging instrument, perfectly scaled for capturing fine detail with modern high-speed video cameras. This versatility makes it a dual-purpose tool for both visual observers and dedicated astrophotographers.\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\u003eExperiencing Jupiter at 4x\u003c\/h3\u003e\n\u003cp\u003eConsider an 8-inch, f\/10 Schmidt-Cassegrain telescope on a night of steady seeing. Inserting a 24mm wide-field eyepiece yields a modest 83x magnification. Now, add the 4x Powermate. The magnification jumps to 332x, a power level where Jupiter resolves from a bright disk into a detailed globe.\u003c\/p\u003e\n\u003cp\u003eAs your eye settles, the image snaps into focus. The two main equatorial belts are no longer simple stripes but complex zones with internal swirls and festoons. You can clearly distinguish the color difference between the North and South Equatorial Belts, and with patience, you might spot smaller ovals and barges within the zones. The Great Red Spot, if visible, appears as a distinct, salmon-colored oval, not just a hint of color. This is the power of the Powermate: it unlocks the full resolving potential of your telescope on the solar system's most challenging targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Magnification: Powermate vs. Barlow\u003c\/h3\u003e\n\u003cp\u003eThe Tele Vue lineup offers several magnification options, and choosing the right one depends on your telescope and goals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. 2x Powermate:\u003c\/strong\u003e The 2x is a versatile, all-around performer suitable for most telescopes. The 4x is a specialist's tool, intended for when you need the maximum practical magnification your telescope and seeing conditions will allow. It is the right choice when the 2x simply doesn't provide enough image scale for small planetary disks or tiny planetary nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue Barlows:\u003c\/strong\u003e A Tele Vue Barlow is an excellent choice for visual use and is more compact. However, the Powermate's telecentric design gives it a distinct advantage for imaging and for use with complex, multi-element eyepieces, where it maintains the designed optical performance without introducing aberrations. The Powermate is the more flexible and optically pure solution, especially at this high 4x factor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA genuine limitation of the 4x Powermate is its sensitivity to atmospheric seeing. A 4x magnification factor will also amplify any turbulence in the air. This tool requires steady skies to deliver its best performance, and on nights of poor seeing, a lower-power amplifier like a 2x model may provide a more pleasing view.\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\"\u003eIs a 4x Powermate too much power for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor planetary viewing, a good rule of thumb for maximum useful magnification is 50x to 60x per inch of aperture. A 4x Powermate is ideal for 8\" or larger telescopes on nights of good seeing. For smaller scopes, it may exceed the useful magnification limit unless used for imaging where short exposures can \"freeze\" the seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between a Powermate and a Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Barlow lens diverges light, which can change an eyepiece's eye relief and introduce aberrations. A Powermate is a 4-element telecentric amplifier that keeps light rays parallel, preserving the eyepiece's native performance and providing a sharper image, especially for imaging and with wide-field eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 4x Powermate for deep-sky observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile possible, it's not its primary purpose. The 4x Powermate is designed for extreme high magnification on bright objects like the Moon and planets. For most deep-sky objects, which are faint and extended, you will want lower magnification to maintain a brighter image and a wider field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 4x Powermate work with my 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2\" Powermate includes a 2\" to 1.25\" adapter, allowing you to use all of your 1.25\" eyepieces securely. The brass clamp ring on the adapter ensures your smaller eyepiece barrels will not be scratched.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the 4x Powermate for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need the Tele Vue PMT-4201 T-Ring adapter. This adapter allows you to unthread the optical cell from the 2\" barrel and connect it directly to a camera-specific T-ring, creating a solid, threaded connection for high-magnification planetary imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the 4x Powermate require a lot of focuser in-travel or out-travel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 4x Powermate is nearly \"parfocal,\" meaning it requires very little refocusing when inserted into the optical train. This makes it easy to switch between observing with and without it during a session without major focuser adjustments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct SKU\u003c\/td\u003e\n\u003ctd\u003eTV-PMT-4201\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e4x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-Element Pupillary Corrector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e19.2 oz (1.20 lbs \/ 544 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e5.2\" (132 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Barrel Diameter\u003c\/td\u003e\n\u003ctd\u003e2.7\" (68.6 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass Clamp Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes (2\")\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\"\u003eTele Vue 4x Powermate - 2\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Eyepiece Adapter\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\"\u003eTop 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\"\u003eBottom 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\/Tele_Vue_4x_Powermate_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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223879909661,"sku":"TV-PMT-4201","price":554.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_4x_Powermate_2in_1.jpg?v=1777515018"},{"product_id":"tele-vue-5x-powermate-1-25-inch","title":"Tele Vue 5x Powermate - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 5x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-Element Telecentric\u003c\/li\u003e\n\u003cli\u003eWeight: 0.40 lbs \/ 181g\u003c\/li\u003e\n\u003cli\u003eTotal Height: 3.1\" \/ 79mm\u003c\/li\u003e\n\u003cli\u003eT-Ring Adapter Ready: Yes (Model PTR-1250)\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\u003eManual\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\u003eReach the Solar System's Most Elusive Details\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 5x Powermate - 1.25\" is a high-magnification visual and imaging accessory that functions as a compact, four-element telecentric amplifier. It delivers a five-fold increase in magnification with optical performance that a standard Barlow lens cannot match, making it the definitive choice for serious planetary, lunar, and double-star observers who require maximum power and image fidelity.\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 Smarter Approach to High-Power Astronomy\u003c\/h3\u003e\n\u003cp\u003eA conventional Barlow lens works by diverging the light cone from the objective, which introduces optical aberrations, particularly with fast f\/ratio telescopes. The Powermate's innovative 4-element telecentric design functions differently. It re-images the focal plane with parallel exiting rays, which means the eyepiece performs as if it were simply viewing a much larger, longer focal length telescope.\u003c\/p\u003e\n\u003cp\u003eThis telecentric correction results in a view that is sharply focused across the entire field, free of the edge-of-field astigmatism and induced field curvature that can soften the image in a simple Barlow. For you, the observer, this means pinpoint stars to the edge of the field and a consistently sharp planetary disk, even in fast Newtonians or apochromatic refractors.\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\u003eDesigned for Critical Planetary Imaging\u003c\/h3\u003e\n\u003cp\u003eThe 5x Powermate is an essential tool for high-resolution planetary imaging. Its telecentric output ensures that the focal plane is flat and the image scale remains constant, regardless of the camera's sensor position. This makes it a preferred choice over Barlows for achieving the large image scales needed to resolve fine details on Jupiter, Saturn, and Mars with modern CMOS cameras.\u003c\/p\u003e\n\u003cp\u003eThe optical housing is designed to unthread from the barrel, allowing direct connection to a camera via a dedicated Powermate T-Ring Adapter. This rigid, threaded connection eliminates any potential for flexure or tilt that can occur with standard nosepiece setups, preserving the alignment critical for capturing sharp, high-contrast images of subtle planetary features.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Experience at 5x Magnification\u003c\/h3\u003e\n\u003cp\u003eThis level of magnification demands steady atmospheric seeing, but when conditions permit, the results are transformative. With a modest telescope like an 8-inch SCT and a 20mm Plössl eyepiece, the 5x Powermate yields 500x. On a good night, Jupiter's Galilean moons resolve from star-like points into distinct, tiny orbs. The Great Red Spot reveals its intricate, swirling texture, and you can trace the subtle festoons and eddies within the equatorial belts.\u003c\/p\u003e\n\u003cp\u003eOn Saturn, the Cassini Division becomes a sharp, black gap rather than a faint pencil line. You may even glimpse the much harder Encke Gap in the outer A ring. This is the Powermate's core function: it pushes your telescope to its absolute resolution limit, revealing details that are simply inaccessible at lower powers.\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\u003eParfocal and Mechanically Sound\u003c\/h3\u003e\n\u003cp\u003eTele Vue has engineered the Powermate to be nearly parfocal. When you insert it into your diagonal, your eyepiece will require minimal refocusing. This practical feature makes it easy to switch between low-power finding views and high-power detailed views without losing your target.\u003c\/p\u003e\n\u003cp\u003eThe physical construction reflects Tele Vue's commitment to quality. The chromed barrel features a safety undercut to prevent it from accidentally slipping out of the focuser, while a non-marring brass clamp ring secures your eyepiece without scratching its barrel. This ensures a secure, perfectly centered optical train every time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Limitation: Atmospheric Seeing\u003c\/h3\u003e\n\u003cp\u003eThe primary constraint for any high-power accessory is the Earth's atmosphere. At 5x magnification, even minor atmospheric turbulence will be amplified, causing the image to shimmer or \"boil.\" This is not a flaw in the Powermate; it is the reality of high-resolution observing. The 5x Powermate is a special-purpose tool, best reserved for those nights of excellent seeing when the air is steady and your telescope can deliver its best performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing the Right Powermate\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers a family of Powermates, and selecting the right one depends on your telescope and goals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. 2.5x Powermate:\u003c\/strong\u003e The 2.5x is a more versatile, all-purpose choice that works well on average nights. The 5x is a specialist's tool, designed to achieve the largest possible image scale for imaging or for visual use on the very best nights with long focal length telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. 4x Powermate (2\"):\u003c\/strong\u003e The 4x offers a similar magnification boost but in a 2-inch format, better suited for large, heavy 2-inch eyepieces. The 1.25\" 5x is lighter and designed for the smaller, shorter focal length eyepieces typically used for planetary viewing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a 5x Powermate better than a 5x Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, optically it is. The Powermate's 4-element telecentric design corrects for aberrations that a simple 2-element Barlow lens cannot. This results in a sharper, flatter field of view, especially in fast telescopes, and it is a superior choice for planetary imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the best use for the 5x Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt excels at high-resolution planetary and lunar imaging, where you need to achieve a large image scale to resolve very fine details. Visually, it is used for splitting tight double stars and for planetary observation on nights of exceptionally steady atmospheric seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 5x Powermate work with my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt will work with any telescope that has a 1.25\" focuser. However, it provides very high magnification. For a telescope with a long focal length like an SCT or Maksutov, you will need eyepieces with longer focal lengths (e.g., 20mm to 25mm) to achieve a usable magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the image blurry when I use the 5x Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt such high power, the image quality is almost always limited by atmospheric turbulence (\"seeing\"), not the optics. If the air is unsteady, the image will appear to shimmer or boil. The 5x Powermate is a specialized tool that requires calm atmospheric conditions to perform at its best.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a camera to the 5x Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need the Tele Vue Powermate T-Ring Adapter (model PTR-1250). You unscrew the chrome barrel from the black optical housing and thread the adapter in its place. This allows you to securely attach a DSLR or dedicated astronomy camera via its T-ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct SKU\u003c\/td\u003e\n\u003ctd\u003eTV-PMT-5126\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e5x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-element telecentric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.40 lbs \/ 181 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight (in focuser)\u003c\/td\u003e\n\u003ctd\u003e2.2\" \/ 56 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Height\u003c\/td\u003e\n\u003ctd\u003e3.1\" \/ 79 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Barrel Diameter\u003c\/td\u003e\n\u003ctd\u003e1.6\" \/ 41 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass Clamp Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eT-Ring Adapter\u003c\/td\u003e\n\u003ctd\u003eTele Vue PTR-1250 (sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 5x Powermate - 1.25 inch\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 5x Powermate - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 1.25-inch Top Dust Cap\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTop 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\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 1.25-inch Bottom Dust Cap\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBottom 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\/Tele_Vue_5x_Powermate_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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223879975197,"sku":"TV-PMT-5126","price":364.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_5x_Powermate_1.25in_1.jpg?v=1777515018"},{"product_id":"tele-vue-2x-barlow-1-25-inch","title":"Tele Vue 2x Barlow - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 2x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 2-Element, Fully Multi-Coated\u003c\/li\u003e\n\u003cli\u003eEyepiece Holder: Brass Compression Ring\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (1.25\")\u003c\/li\u003e\n\u003cli\u003eWeight: 5 oz (142 g)\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\u003eDouble Your Magnification, Not Your Eyepiece Collection\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 2x Barlow - 1.25\" is a foundational accessory designed to double the power of any 1.25\" eyepiece with exceptional optical quality. It effectively doubles the utility of your existing eyepiece set, providing a high-performance, cost-effective way to access higher magnifications for planetary, lunar, and double-star observing without compromising image integrity.\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 High-Contrast 2-Element Optical System\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Tele Vue 2x Barlow is a two-element, fully multi-coated optical design. This is not just a simple magnifier. The lens group is engineered to be a seamless extension of your eyepiece, preserving the sharpness, contrast, and color fidelity of the original view, just at twice the magnification.\u003c\/p\u003e\n\u003cp\u003eThe high-transmission coatings on every air-to-glass surface ensure that scattering and reflections are minimized. This results in a darker background sky and allows subtle details on bright objects, like the Cassini Division in Saturn's rings or the delicate banding on Jupiter, to resolve with clarity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eParfocal Integration with Tele Vue Eyepieces\u003c\/h3\u003e\n\u003cp\u003eThis Barlow is designed to integrate smoothly into your observing workflow, especially if you use Tele Vue Plössl or Panoptic eyepieces. It is nearly parfocal, meaning you will need little to no refocusing when inserting or removing the Barlow. This is a significant practical advantage in the field.\u003c\/p\u003e\n\u003cp\u003eImagine you are observing Jupiter with a 25mm Plössl. When you add the 2x Barlow to get a closer look, the planet snaps back into focus with a minimal turn of the knob. This keeps your target centered and your attention on the view, not on the mechanics of the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Security of a Brass Compression Ring\u003c\/h3\u003e\n\u003cp\u003eMany simple Barlows use a basic thumbscrew that presses directly against your eyepiece barrel, causing scratches and dents over time. The Tele Vue 2x Barlow incorporates a non-marring brass compression ring. When you tighten the thumbscrew, this soft metal ring gently and uniformly tightens around the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThis mechanism provides two key benefits. First, it protects your investment in quality eyepieces by preventing cosmetic damage. Second, it ensures a more secure and perfectly centered connection, which is critical for maintaining optical alignment at high power.\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\u003eThoughtful Mechanical Design for Field Use\u003c\/h3\u003e\n\u003cp\u003eEvery mechanical detail is built for reliability. The main barrel features a safety undercut, a groove that catches the focuser's thumbscrew if it loosens unexpectedly. This simple feature can prevent the Barlow and your expensive eyepiece from falling to the ground on a cold, dark night.\u003c\/p\u003e\n\u003cp\u003eThe lens element itself is housed in a cell that can be unscrewed from the main barrel. This cell has standard 1.25\" filter threads, allowing you to attach a planetary or moon filter directly to the Barlow. This versatility lets you experiment with different optical configurations, including increasing the magnification factor by adding extension tubes.\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\u003eObserving Jupiter's Great Red Spot\u003c\/h3\u003e\n\u003cp\u003eWith a 13mm Nagler eyepiece in an 8\" f\/10 SCT, you have 154x magnification, a good power for general planetary viewing. Now, insert the Tele Vue 2x Barlow. The magnification jumps to 308x, pushing the limits of atmospheric seeing but bringing Jupiter's disk to an impressive size.\u003c\/p\u003e\n\u003cp\u003eAs your eye settles, the view is not just larger, it remains sharp. The Great Red Spot, often a subtle salmon-colored oval, now shows hints of internal texture. You can more easily discern smaller, transient storms and the intricate whorls within the North and South Equatorial Belts. This is the difference a high-quality Barlow makes, transforming a good view into a detailed study.\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 Foundational Tool for High-Resolution Observing\u003c\/h3\u003e\n\u003cp\u003eThe primary trade-off with any Barlow is the addition of more glass to the light path. While Tele Vue's design minimizes light loss and reflections, a single long-focal-length eyepiece will theoretically have slightly higher throughput. However, the Tele Vue 2x Barlow provides a level of versatility and optical performance that makes it an indispensable tool for nearly any observer.\u003c\/p\u003e\n\u003cp\u003eFor observers who want to get the most out of a curated set of high-quality eyepieces, this Barlow is the right choice. It provides access to the high-power realm required for serious planetary and double-star work without the cost and bulk of a dedicated set of short-focal-length eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing the Right Tele Vue Magnifier\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several magnification solutions. Understanding their design intent helps you choose the right one for your specific needs.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2x Barlow:\u003c\/strong\u003e The classic choice for visual observing. It is lightweight, simple, and optimized to deliver high-contrast, high-magnification views with any eyepiece. Its primary purpose is to double the magnification for planetary, lunar, and double star observation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3x Barlow:\u003c\/strong\u003e Offers more power in the same compact form factor. This is an excellent choice for short-focal-length telescopes where achieving very high magnifications for planetary imaging or splitting tight double stars is the main goal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePowermate:\u003c\/strong\u003e A more complex 4-element design that acts as a pupil-correcting image amplifier. Powermates are specifically engineered to be telecentric, meaning they do not move the exit pupil or change the eye relief of the eyepiece. This makes them a superior choice for imaging and for use with long-focal-length eyepieces where a standard Barlow might introduce vignetting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Tele Vue 2x Barlow work with any brand of eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is compatible with any standard 1.25\" eyepiece. While it is parfocal with many Tele Vue eyepieces, it will perform exceptionally well optically with eyepieces from any manufacturer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between a Barlow and a Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Barlow is a diverging lens that increases magnification but can alter the eyepiece's eye relief and exit pupil position. A Powermate is a 4-element telecentric amplifier that increases magnification while keeping the eyepiece's optical properties intact, making it a better choice for imaging and long-focal-length eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with this Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the bottom lens element cell has standard 1.25\" (M28.5 x 0.6) threads, allowing you to attach any standard 1.25\" filter directly to the Barlow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I get more than 2x magnification from this Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can increase the magnification by unscrewing the black barrel and adding a 1.25\" extension tube between the Barlow's lens element and the eyepiece. The farther the eyepiece is from the lens, the higher the magnification will be.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Tele Vue Barlow worth the price compared to cheaper models?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Tele Vue 2x Barlow uses high-quality glass, superior multi-coatings, and a non-marring compression ring. These features result in sharper, higher-contrast images and protect your eyepieces from damage, justifying the investment for serious observers.\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\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eBLW-2125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e2-element, fully multi-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass compression ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e1.25\" (M28.5 x 0.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e5 oz (142 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e2.7\" (69 mm)\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\"\u003eTele Vue 2x Barlow - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTop 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\"\u003eBottom 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\/Tele_Vue_2x_Barlow_1.25-inch_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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880073501,"sku":"TV-BLW-2125","price":214.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2x_Barlow_1.25in_1.jpg?v=1777515017"},{"product_id":"tele-vue-2x-big-barlow-2-inch","title":"Tele Vue 2x BIG Barlow - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 2x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 2\" with 1.25\" Adapter\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-Element, Telecentric\u003c\/li\u003e\n\u003cli\u003eCoatings: Fully Multi-Coated\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (48mm for 2\" Filters)\u003c\/li\u003e\n\u003cli\u003eWeight: 0.75 lbs \/ 340 g\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\u003eManual\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\u003eDouble the Power, Not the Problems\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 2x BIG Barlow - 2\" is an amplification lens engineered to double the magnification of your eyepieces without compromising the optical integrity of your telescope system. Designed for observers who use premium 2\" and 1.25\" eyepieces, this is not a simple two-element Barlow. It is a sophisticated four-element telecentric amplifier that delivers high-contrast, high-fidelity views for both visual observation and imaging.\u003c\/p\u003e\n\u003cp\u003eIts primary purpose is to increase magnification while preserving the eye relief of your favorite long focal length eyepieces and maintaining a flat, well-corrected field. For the planetary observer or high-resolution deep-sky enthusiast, the Big Barlow transforms a low-power eyepiece into a high-power planetary instrument with a single motion, often with little to no refocusing required.\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 Smarter Optical Path for High Magnification\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Big Barlow is a four-element, telecentric optical design. Unlike a traditional Barlow that diverges the light cone, this system keeps the exiting light rays parallel to the optical axis. This subtle but critical difference is what allows it to be nearly \"parfocal,\" meaning you will not have to substantially change focus when you insert it into the optical train.\u003c\/p\u003e\n\u003cp\u003eThis design also corrects for spherical aberration that can be introduced when using long focal-length eyepieces. The result is a sharper, higher-contrast image across the entire field of view. Stars remain tight pinpoints from the center to the edge, a performance characteristic that simpler Barlows often fail to achieve, especially in fast telescopes.\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\u003eMaximum Light Throughput with Multi-Coatings\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the Big Barlow is multi-coated with Tele Vue's proprietary high-transmission coatings. This ensures that the maximum amount of light from your telescope's objective reaches your eye or camera sensor. The practical effect is a brighter, higher-contrast image with minimized ghosting and internal reflections.\u003c\/p\u003e\n\u003cp\u003eWhen you are pushing your telescope to its magnification limits on a target like Jupiter, this increased contrast makes a real difference. Faint festoons in the cloud belts and subtle color variations in the zones become more perceptible because stray light has been effectively suppressed within the optical system.\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 with Parfocal Performance\u003c\/h3\u003e\n\u003cp\u003eOne of the most practical benefits of the Big Barlow's design is its parfocal nature. You can switch between observing with an eyepiece alone and with the Big Barlow in place and require only a minimal tweak of the focuser. This is a significant workflow advantage in the field, especially during nights of good seeing when you want to quickly increase power to catch fleeting planetary detail.\u003c\/p\u003e\n\u003cp\u003eWith a 32mm Plössl, you can frame the entire Double Cluster in Perseus. Insert the Big Barlow, and without a major focus change, you are now observing the core of one of the clusters at twice the power, resolving individual star colors. This seamless transition from low-power finding to high-power observing is what sets this amplifier apart.\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\u003eVersatile Eyepiece Compatibility with the 1.25\" Adapter\u003c\/h3\u003e\n\u003cp\u003eThe Big Barlow is designed to be the only amplification lens you need. It includes a high-quality 2\" to 1.25\" adapter that features a non-marring brass clamp ring. This ensures your smaller, high-end eyepieces are held securely and perfectly centered in the optical path without scratching their barrels.\u003c\/p\u003e\n\u003cp\u003eThis versatility means you can use your entire eyepiece collection, from a massive 2\" wide-field eyepiece for deep-sky vistas to a small 1.25\" planetary eyepiece for lunar and planetary work. The robust build quality easily handles the weight and leverage of even the heaviest eyepieces in the Tele Vue lineup.\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\u003eDirect Filter Integration for Enhanced Views\u003c\/h3\u003e\n\u003cp\u003eThe 2\" barrel of the Big Barlow is threaded to accept standard 48mm astronomical filters. This allows you to place a filter, such as a nebula filter or a planetary color filter, in the optical train before the eyepiece. This is particularly useful for enhancing contrast on specific targets.\u003c\/p\u003e\n\u003cp\u003eFor example, you can thread in a UHC or OIII filter and use the Big Barlow to increase the image scale on a target like the Orion Nebula (M42). The filter darkens the sky background, and the Barlow brings the fine details of the Trapezium region into clear view, all while using a comfortable, long eye relief eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuilt for Stability and Security\u003c\/h3\u003e\n\u003cp\u003eWeighing in at just over a pound, the Big Barlow is a substantial piece of equipment. Its all-metal construction is designed to prevent any flexure, even when holding heavy 2\" eyepieces like a 31mm Nagler. This mechanical rigidity is essential for maintaining optical alignment at high magnifications.\u003c\/p\u003e\n\u003cp\u003eThe one genuine trade-off for this performance is its weight and size. It requires a robust 2\" focuser and may necessitate re-balancing the telescope, particularly on smaller mounts. However, this is a necessary compromise to achieve a stable, flex-free optical train capable of supporting the best eyepieces available.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Amplifier: Big Barlow vs. Powermate\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers two distinct families of amplifiers. The choice depends on your primary application.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue 2x Big Barlow:\u003c\/strong\u003e This is the ideal choice for visual observers who want a simple, high-performance 2x multiplier that is nearly parfocal and preserves the eyepiece's eye relief. It is optimized for placing between the telescope and the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue 2x Powermate:\u003c\/strong\u003e The Powermate is the superior choice for imaging. Its telecentric design is specifically engineered to work well with coma correctors and to be used in front of a diagonal for applications like Hydrogen-alpha solar observing, where it acts as a secondary telecentric element. For visual use, its performance is similar to the Big Barlow, but for imaging, the Powermate offers more flexibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Big Barlow the same as a Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, while both use a 4-element design, the Big Barlow is optimized for visual use and being parfocal. The Powermate is a true telecentric amplifier designed for both visual and imaging, offering more flexibility for complex imaging trains and solar applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 2x Big Barlow work with my fast f\/4.5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 4-element design provides excellent correction and maintains sharp star images even in fast optical systems. It is a much better choice for fast scopes than a standard 2-element Barlow, which can induce aberrations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to rebalance my telescope when I use this?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt over one pound, it is very likely you will need to adjust your telescope's balance, especially when switching from a lightweight 1.25\" eyepiece. It is best suited for telescopes with sturdy focusers and mounts that can handle the extra weight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I thread a 2\" filter onto the Big Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 2\" barrel is threaded for standard 48mm filters. This allows you to add a filter to the optical path before the eyepiece, which is useful for nebula or planetary observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is this better than a standard, cheaper 2\" Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Big Barlow's 4-element telecentric design offers superior aberration control, maintains the eye relief of your eyepiece, and is nearly parfocal. Cheaper 2-element designs often result in softer images, especially at the field edge, and require significant refocusing.\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\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eTV-BWC-2211\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter\u003c\/td\u003e\n\u003ctd\u003e2\" to 1.25\" with brass clamp ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-element, telecentric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully multi-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eAccepts 48mm (2\") filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.75 lbs \/ 12 oz \/ 340 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e4.8\" \/ 122 mm\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\"\u003eTele Vue 2x BIG Barlow - 2\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Adapter\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\"\u003e2\" Dust Cap (Top)\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\"\u003e2\" Dust Cap (Bottom)\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\/Tele_Vue_2x_BIG_Barlow_2-inch_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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880106269,"sku":"TV-BWC-2211","price":364.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2x_Big_Barlow_2in_1.jpg?v=1777515017"},{"product_id":"tele-vue-3x-barlow-1-25-inch","title":"Tele Vue 3x Barlow - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMagnification Factor: 3x\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eOptical Design: 3-element, apochromatic\u003c\/li\u003e\n\u003cli\u003eCoatings: Fully multi-coated\u003c\/li\u003e\n\u003cli\u003eCompression Ring: Yes, brass\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes, 1.25\"\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\u003eManual\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\u003eTriple Your Magnification, Not Your Eyepiece Collection\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 3x Barlow - 1.25\" is a compact, high-performance image amplifier that triples the power of any 1.25\" eyepiece in your collection. Designed with a sophisticated 3-element optical system, it delivers sharp, high-contrast views that preserve the original quality of your favorite eyepieces, making it an essential tool for serious lunar, planetary, and double-star observers.\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\u003eApochromatic 3-Element Optical Design\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard Barlow that uses a simple two-element design, the Tele Vue 3x Barlow employs a three-element, apochromatic layout. This additional lens corrects for chromatic aberration and other optical errors introduced by the magnification process itself. The result is a view with significantly reduced false color, enabling you to see the true hues of Jupiter's cloud bands and the subtle color differences in binary star pairs.\u003c\/p\u003e\n\u003cp\u003eThis design also maintains the eye relief and exit pupil characteristics of your eyepiece better than simpler designs. When you insert a 25mm Plössl, it performs like a high-power 8.3mm eyepiece, but you retain the comfortable eye relief of the 25mm. This is a critical advantage for observers who wear glasses or prefer the comfort of longer focal length eyepieces during high-magnification sessions.\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\u003eFully Multi-Coated for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the 3x Barlow is multi-coated with Tele Vue's proprietary anti-reflection coatings. This meticulous process ensures that more than 99% of the incoming light passes through to your eye, preventing internal reflections that can wash out faint details. The practical effect is a darker background sky and a higher-contrast image, allowing you to pick out faint crater-floor details on the Moon or the delicate crepe ring of Saturn against the planet's glare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eParfocal for Seamless Power Changes\u003c\/h3\u003e\n\u003cp\u003eThe Tele Vue 3x Barlow is engineered to be approximately parfocal with Tele Vue eyepieces. This means that when you insert the Barlow and eyepiece combination into your focuser, the image will remain nearly in focus. This thoughtful design minimizes the need for large focus adjustments, saving valuable time in the field and allowing you to switch between low and high power quickly without losing your target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure, Non-Marring Brass Clamp Ring\u003c\/h3\u003e\n\u003cp\u003eTo protect your eyepiece investment, the Tele Vue 3x Barlow uses a brass compression ring instead of a simple set screw. When you tighten the lock screw, the soft brass ring gently and evenly squeezes the eyepiece barrel. This provides a more secure, centered grip that preserves perfect optical alignment and prevents the deep scratches and gouges that set screws inflict on your equipment.\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\u003eIntegrated 1.25\" Filter Threads\u003c\/h3\u003e\n\u003cp\u003eThe bottom of the Barlow's barrel is threaded to accept standard 1.25\" astronomical filters. This allows you to add a Moon filter, a color planetary filter, or a light pollution filter to the Barlow itself. Any eyepiece you then insert will benefit from the filtration, saving you the hassle of threading and unthreading filters from individual eyepieces as you change magnifications.\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\u003eSaturn's Division, Sharpened and Defined\u003c\/h3\u003e\n\u003cp\u003eThe true test of a high-power accessory is how it performs on a challenging target when seeing conditions are favorable. With a quality 12mm eyepiece in a 4-inch refractor, providing 75x magnification, slide the 3x Barlow into the diagonal. The power jumps to 225x, and as your eye settles, the Cassini Division in Saturn's rings transforms from a thin, hazy line into a sharp, black gap. The Barlow's control of scattered light makes the separation distinct, a direct result of the multi-coated, 3-element optics at work.\u003c\/p\u003e\n\u003cp\u003eOne trade-off of this high magnification is a dimmer image and a greater sensitivity to atmospheric turbulence. On nights of poor seeing, the 3x amplification may be too much, and a 2x Barlow might provide a more stable view. This makes the 3x Barlow a specialist for nights when the atmosphere cooperates, rewarding your patience with moments of genuine resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Magnification: Tele Vue Barlows and Powermates\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several magnification options. Understanding where the 3x Barlow fits in helps in making the right choice for your observing style.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue 2x Barlow:\u003c\/strong\u003e The 2x Barlow is a versatile workhorse, ideal for general-purpose use and a good match for most telescopes. The 3x Barlow is a more specialized tool, designed for when you need a significant jump in power for planetary observation or splitting tight double stars, and when seeing conditions permit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue 2.5x Powermate:\u003c\/strong\u003e The Powermate is a 4-element design that is more complex and specifically designed to be telecentric, meaning it keeps the light rays parallel. This is a critical feature for imaging and for use with hydrogen-alpha solar filters. For purely visual use, the 3x Barlow offers more magnification in a lighter, more affordable package, while the Powermate provides a higher degree of optical correction for imagers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use a 3x Barlow instead of a 2x?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUse the 3x Barlow when observing bright targets like the Moon and planets on nights of good atmospheric seeing. It provides the high magnifications needed to resolve fine details that a 2x Barlow might not reach with your existing eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 3x Barlow work with my non-Tele Vue eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Tele Vue 3x Barlow is compatible with any standard 1.25\" eyepiece. Its high-quality optics are designed to amplify the image without introducing significant aberrations, preserving the performance of your eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a 3x Barlow too much power for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA general rule is to not exceed 50x to 60x per inch of aperture. If you have a 4\" (100mm) telescope, your practical limit is around 200-240x. The 3x Barlow may push past this limit with shorter focal length eyepieces, so it's best used with mid-to-low power eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between a Barlow and a Powermate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Barlow is a diverging lens that increases focal length. A Powermate is a 4-element telecentric amplifier that corrects for aberrations while magnifying. For visual use, both are excellent, but Powermates are superior for imaging as they do not change the exit pupil position of the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with this Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the barrel of the Tele Vue 3x Barlow is threaded to accept standard 1.25\" filters. This allows you to attach a filter to the Barlow and have its effect applied to any eyepiece you insert.\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\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eBLW-3125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e3x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3-element, Apochromatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e6.4 oz (181 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e3.4\" (86 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e1.25\" (M28.5 x 0.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSecuring Mechanism\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring\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\"\u003eTele Vue 3x Barlow - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cap (Top)\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\"\u003e1.25\" Dust Cap (Bottom)\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\/Tele_Vue_3x_Barlow_1.25-inch_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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880204573,"sku":"TV-BLW-3125","price":214.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_3x_Barlow_1.25in_1.jpg?v=1777515018"},{"product_id":"svbony-5x-barlow-lens-125in","title":"SVBONY 5X Barlow Lens - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e5X Magnification Power\u003c\/li\u003e\n\u003cli\u003e1.25\" (31.7mm) Barrel Size\u003c\/li\u003e\n\u003cli\u003eMulti-Coated Optical Glass\u003c\/li\u003e\n\u003cli\u003eDurable Metal Housing\u003c\/li\u003e\n\u003cli\u003eWeight: 3.0oz (85g)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSvbony Barlow Lens 1.25 inch 5X\u003c\/h2\u003e\n\u003cp\u003eThe Svbony 5X Barlow Lens quintuples the magnification of any 1.25-inch eyepiece, providing the power needed for high-resolution planetary and lunar observation. Constructed from metal and optical glass, its lightweight 3.0oz (85g) body adds minimal weight to your focuser, preserving your telescope's balance while delivering extreme magnification.\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\u003e5X Magnification: Pushing Your Telescope to its Planetary Limits\u003c\/h3\u003e\n\u003cp\u003eA 5X magnification factor is a specialized tool designed to extract the maximum possible detail on bright targets. This level of power allows you to resolve fine craterlet chains on the Moon, separate tight double stars, and discern subtle cloud bands on Jupiter or the Cassini Division in Saturn's rings, even with shorter focal length telescopes.\u003c\/p\u003e\n\u003cp\u003eAchieving sharp views at 5X requires stable atmospheric seeing. On nights of excellent seeing, this Barlow transforms your view, but on nights of average seeing, a lower-power Barlow will yield a more stable image. It is an essential accessory for dedicated planetary imagers and observers who want to be ready when conditions permit.\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 Quality: Multi-Coated Glass in a 3.0oz Metal Housing\u003c\/h3\u003e\n\u003cp\u003eThe Svbony 5X Barlow uses multi-coated optical glass elements to maximize light transmission and reduce internal reflections. This ensures that the high-magnification views are as bright and high-contrast as possible, preventing a \"washed-out\" image that can occur with inferior optics.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal Construction:\u003c\/strong\u003e The housing is machined from metal, providing a durable and secure fit in your focuser and for your eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Design:\u003c\/strong\u003e At just 3.0oz (85g), it won't cause significant balance issues on most telescope mounts, a critical factor when imaging at high focal lengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Barrel:\u003c\/strong\u003e The 1.25\" barrel is compatible with the vast majority of astronomical eyepieces and accessories.\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\u003eSvbony 5X vs. 2X\/3X Barlows: When to Use Maximum Magnification\u003c\/h3\u003e\n\u003cp\u003eWhile 2X and 3X Barlows are general-purpose accessories, the 5X Barlow is a specialist's tool. It excels in specific scenarios where lower-power Barlows may not provide enough image scale.\u003c\/p\u003e\n\u003cp\u003eChoose the 5X Barlow when your goal is to achieve the largest possible image scale for planetary imaging, especially with cameras that have larger pixels. Visually, it's the right choice for observers with short focal length refractors or those attempting to split the most challenging double stars. For general deep-sky or wide-field lunar viewing, a 2X Barlow remains the more versatile option.\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 purpose of the Svbony 5X Barlow Lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of the Svbony 5X Barlow is to dramatically increase magnification for observing and imaging bright, small targets. It is ideal for detailed views of planets like Jupiter and Saturn, lunar craters, and for splitting tight double stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Svbony 5X Barlow work with my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, if your telescope uses a 1.25\" focuser and accepts 1.25\" eyepieces, the Svbony 5X Barlow is compatible. Its standard \u003cstrong\u003e1.25\" (31.7mm)\u003c\/strong\u003e barrel fits all standard focusers and diagonals of that size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a 5X magnification too much power for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 5X magnification can exceed the useful magnification limit of a telescope, especially on nights with poor atmospheric \"seeing.\" A general rule is to not exceed 50x-60x per inch of aperture. This Barlow is most effective on nights of very steady air or for planetary imaging, where large image scale is the priority.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Svbony 5X Barlow affect image brightness?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAny increase in magnification spreads the same amount of light over a larger area, resulting in a dimmer image. A 5X increase will make the image significantly dimmer than with no Barlow. This is why it's best suited for bright objects like the Moon and planets, not faint deep-sky objects like nebulae or galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Svbony 5X Barlow to see the Cassini Division on Saturn with my 80mm refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, under very steady atmospheric conditions, an 80mm refractor can reveal the Cassini Division. Using the Svbony 5X Barlow will provide the necessary magnification to make the gap more apparent, but the final image quality will be entirely dependent on the stability of the atmosphere (seeing).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Svbony 5X Barlow a good choice for imaging Jupiter with a planetary camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. For planetary imaging, achieving a large image scale on the camera sensor is critical. The Svbony 5X Barlow is an excellent tool for this, allowing you to capture fine details in Jupiter's cloud bands. It helps you achieve the optimal focal ratio (typically f\/15-f\/25) for high-resolution imaging with modern CMOS 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\u003eItem Name\u003c\/td\u003e\n\u003ctd\u003e1.25\" 5x Barlow Lens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.7mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Power\u003c\/td\u003e\n\u003ctd\u003e5X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eMetal + Optical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.0oz (85g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSvbony 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861233168669,"sku":"SV-F9102A","price":21.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-Barlow-Lens-1-25-inch-5X-1_8dabccc8-733b-498a-989f-fcf6ba205d87.jpg?v=1788659965"},{"product_id":"svbony-2x-barlow-lens-with-m42-threads-125in","title":"SVBONY 2X Barlow Lens with M42 Threads - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2X Magnification Factor\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eIntegrated M42x0.75 T-Threads for Cameras\u003c\/li\u003e\n\u003cli\u003eMultilayer HD Broadband Green Film Coatings\u003c\/li\u003e\n\u003cli\u003eFull Metal 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\u003e2X Barlow 1.25inch with M42 Threads\u003c\/h2\u003e\n\u003cp\u003eThis 2X Barlow lens instantly doubles the power of any 1.25\" eyepiece and features an integrated M42x0.75 thread for direct camera attachment. Constructed from solid metal with a compact 7.5cm length, its pure optical glass lenses are treated with a multilayer HD broadband green film to maximize image contrast and light transmission.\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\u003e2X Magnification with Multilayer HD Coatings\u003c\/h3\u003e\n\u003cp\u003eBy doubling the magnification of your eyepiece collection, this 2X Barlow brings fine details on Jupiter's cloud bands and the Moon's craters into sharp focus. The pure optical glass lenses feature a multilayer HD broadband green film, ensuring the magnified view remains bright and high-contrast by mitigating the inherent light loss of adding extra glass elements.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble Your Eyepiece Collection:\u003c\/strong\u003e Effectively turns your existing eyepieces into a set with twice the magnification options, ideal for achieving the optimal power for planetary viewing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Contrast Views:\u003c\/strong\u003e The multilayer HD green film preserves the original image quality by minimizing internal reflections, which is critical for discerning subtle planetary features.\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\u003eM42 x 0.75 Threads for Direct Camera Attachment\u003c\/h3\u003e\n\u003cp\u003eThe integrated M42x0.75 thread transforms this Barlow from a visual accessory into an imaging tool. This standard T-thread allows you to securely connect a DSLR or dedicated astronomy camera (with the appropriate T-ring, not included) directly to the Barlow, creating a solid optical train for high-magnification lunar and planetary astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAll-Metal Construction in a 2.95-inch Body\u003c\/h3\u003e\n\u003cp\u003eBuilt entirely from metal, this Barlow is designed for rigidity and long-term use in the field. At a length of just 2.95 inches (7.5cm), it adds minimal length to your imaging train and balances easily, while providing a secure, non-flexing platform for both heavy eyepieces and cameras.\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 this 2X Barlow lens affect my telescope's focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis 2X Barlow doubles your telescope's effective focal length. For example, if you have a telescope with a 1000mm focal length, using this Barlow makes it perform like a 2000mm telescope, doubling the magnification of any eyepiece you use with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do I need to connect my camera to the Barlow's M42 threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need a \u003cstrong\u003eT-ring\u003c\/strong\u003e that is specific to your camera's lens mount (e.g., Canon EOS, Nikon F, Sony E-mount). The T-ring screws onto the Barlow's M42x0.75 threads, and your camera body then attaches to the T-ring as it would to a lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 1.25-inch Barlow work with 2-inch eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This Barlow has a 1.25\" barrel and is designed to be used with standard 1.25\" eyepieces and accessories only. It will not fit into a 2\" focuser without an adapter, and it cannot hold a 2\" eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this 2X Barlow suitable for deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile primarily designed for high-magnification views of bright objects like the Moon and planets, it can be used to get a closer look at smaller, bright deep-sky objects like planetary nebulae (e.g., the Ring Nebula, M57) or globular clusters (e.g., the Hercules Cluster, M13). However, it will dim the view, which is not ideal for faint galaxies or large nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will this 2X Barlow perform on Saturn with an 8-inch f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn 8\" f\/10 SCT has a focal length of around 2000mm. This 2X Barlow will increase that to 4000mm. With a 20mm eyepiece, this would yield 200x magnification, an excellent power for seeing Cassini's Division in Saturn's rings and subtle cloud bands on the planet's surface under steady seeing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 2X Barlow to get a closer view of the Orion Nebula (M42) in my 4-inch refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can use it to magnify specific regions within the Orion Nebula (M42), such as the Trapezium star cluster at its core. However, the 2X magnification will also darken the image and significantly narrow the field of view, preventing you from seeing the entire nebula at once. For wide, bright views of M42, it's best to observe without a Barlow.\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\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.7mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Interface\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Material\u003c\/td\u003e\n\u003ctd\u003ePure optical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coating\u003c\/td\u003e\n\u003ctd\u003eMultilayer HD broadband green film\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e2.95\" \/ 7.5cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\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\"\u003e2X Barlow 1.25inch with M42 Threads\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSvbony Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861233201437,"sku":"SV-F9108A","price":21.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-2X-Barlow-1-25inch-with-M42-Threads-1_e64cd664-136d-4d6d-b6e4-57e31838a0b7.jpg?v=1788659972"},{"product_id":"svbony-sv136-3x-barlow-lens-125in","title":"SVBONY SV136 3X Barlow Lens - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTriples eyepiece magnification by a factor of 3x\u003c\/li\u003e\n\u003cli\u003eFits standard 1.25 inch focusers and accessories\u003c\/li\u003e\n\u003cli\u003eAchromatic 3-element, 2-group lens design minimizes color fringing\u003c\/li\u003e\n\u003cli\u003eFeatures multilayer HD broadband green film coatings for high contrast\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eSvbony SV136 Barlow 3x 1.25 inch\u003c\/h2\u003e\n      \u003cp\u003eThe Svbony SV136 Barlow delivers a full 3x magnification increase to any 1.25 inch eyepiece, achieved through an advanced 3-element, 2-group achromatic lens structure. This design, combined with multilayer HD broadband green film coatings, ensures that the tripled power does not come at the cost of sharpness or color fidelity, providing high-contrast views of planetary surfaces and tight double stars.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e3-Element Achromatic Design: 3x Magnification with High Correction\u003c\/h3\u003e\n      \u003cp\u003eUnlike basic 2-element Barlows, the Svbony SV136 uses a more complex 3-element in 2-groups optical layout. This achromatic design actively corrects for chromatic aberration, preventing the distracting blue or yellow halos that can appear around bright objects like Jupiter or the lunar limb at high power. The result is a sharper, more color-pure image, allowing you to push magnification on nights of good seeing.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAchromatic Correction:\u003c\/strong\u003e The 3-element lens system significantly reduces false color for true-to-life views of planetary cloud bands and stellar colors.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMultilayer HD Coatings:\u003c\/strong\u003e Fully multi-coated optics maximize light transmission and suppress internal reflections, enhancing image brightness and contrast.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eMaximizing Detail in 1.25\" Fast Telescopes\u003c\/h3\u003e\n      \u003cp\u003eThis 3x Barlow is particularly effective in telescopes with short focal lengths, such as fast Newtonians or short-tube refractors. It allows you to reach the high magnifications needed for detailed planetary observation using longer eye-relief 1.25 inch eyepieces, which are far more comfortable to look through than very short focal length Plössls or orthoscopics.\u003c\/p\u003e\n      \u003cul\u003e\n          \u003cli\u003e\n\u003cstrong\u003eUniversal 1.25\" Barrel:\u003c\/strong\u003e Slides into any standard 1.25\" focuser or diagonal, making it compatible with a vast range of telescopes and eyepieces.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eSecure Eyepiece Lock:\u003c\/strong\u003e A built-in set screw holds your eyepiece firmly in place, preventing any wobble or accidental slips during observation.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eSvbony SV136 3x vs. Standard 2x Barlows: When to Use More Power\u003c\/h3\u003e\n      \u003cp\u003eA 2x Barlow is a versatile workhorse, but a 3x Barlow like the SV136 is a specialist tool for when atmospheric conditions permit maximum magnification. On nights of steady seeing, the 3x factor can reveal finer details, such as the Cassini Division in Saturn's rings or subtle festoons in Jupiter's belts, that might be missed at 2x.\u003c\/p\u003e\n      \u003cp\u003eThe primary trade-off is sensitivity to atmospheric turbulence; a 3x Barlow will amplify poor seeing more than a 2x. However, for a dedicated planetary observer with a well-collimated telescope, the SV136 offers a critical step up in power for those fleeting moments of perfect atmospheric stability.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Svbony SV136's 3-element lens design?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e3-element, 2-group achromatic design\u003c\/strong\u003e provides superior color correction compared to simpler 2-element Barlows. This minimizes chromatic aberration (color fringing) on high-contrast targets like the Moon and bright planets, resulting in a sharper and more natural-looking image at high magnification.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Svbony SV136 3x Barlow a good choice for my 8-inch f\/5 Dobsonian?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it's an excellent match. An 8-inch f\/5 Dobsonian has a focal length of about 1000mm. With a 25mm eyepiece, you get 40x magnification. Using the Svbony SV136 3x Barlow with that same eyepiece boosts the power to 120x, a great starting point for planetary detail, without requiring an uncomfortable short-focal-length eyepiece.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use the Svbony SV136 3x Barlow instead of a 2x for viewing Saturn?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eUse the \u003cstrong\u003eSvbony SV136 3x Barlow\u003c\/strong\u003e on nights of very steady atmospheric seeing. While a 2x Barlow provides a reliable power boost, the 3x is for pushing your telescope to its limit. If the air is stable, the 3x magnification can make the Cassini Division in Saturn's rings appear as a sharp, black gap, a detail that might be less distinct at 2x.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Svbony SV136 3x Barlow work with my existing 1.25\" eyepieces?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. The Svbony SV136 features a standard \u003cstrong\u003e1.25 inch barrel\u003c\/strong\u003e that is compatible with virtually all 1.25\" telescope eyepieces, diagonals, and focusers from any brand. It includes a set screw to securely hold your eyepiece in place.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do the coatings on the Svbony SV136 Barlow improve the view?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe lenses feature a \u003cstrong\u003emultilayer HD broadband green film\u003c\/strong\u003e. These advanced coatings increase light transmission and drastically reduce internal reflections and glare. This leads to a brighter, higher-contrast image, which is crucial for seeing faint details on planetary surfaces.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Svbony SV136 3x Barlow for planetary imaging?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it is very useful for planetary imaging. A 3x Barlow increases the effective focal length of your telescope, which enlarges the image of a planet on your camera's sensor. This allows you to capture more detail on small targets like Mars, Jupiter, and Saturn with a dedicated planetary camera.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e3x\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLens Structure\u003c\/td\u003e\n\u003ctd\u003e3-Elements \/ 2-Groups, Achromatic\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eMultilayer HD broadband green film\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861235495197,"sku":"SV-F9172C","price":30.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV136-Barlow-3x-1-25-inch-1_1248c580-3446-473c-904a-742a7daaaaf2.jpg?v=1788660096"},{"product_id":"svbony-sv137-2x-fmc-barlow-lens-with-m42-threads-125in","title":"SVBONY SV137 2X FMC Barlow Lens with M42 Threads - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eInstantly doubles the magnification of any 1.25\" eyepiece\u003c\/li\u003e\n\u003cli\u003eFully multi-coated (FMC) optics for bright, high-contrast views\u003c\/li\u003e\n\u003cli\u003eFeatures M42 x 0.75 T-threads for direct camera attachment\u003c\/li\u003e\n\u003cli\u003eBrass compression ring secures eyepieces without scratching barrels\u003c\/li\u003e\n\u003cli\u003eDurable, CNC-machined aluminum body\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSVBONY SV137 1.25\" 2X FMC Barlow Lens\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV137 2X Barlow Lens instantly doubles the power of any 1.25\" eyepiece, effectively expanding your magnification options without needing a separate set of high-power eyepieces. With integrated M42 x 0.75 T-threads, it also serves as a 2x amplifier for astrophotography, allowing direct connection to a DSLR T-ring for planetary and lunar imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2x Magnification Boost with Fully Multi-Coated Optics\u003c\/h3\u003e\n\u003cp\u003eThis Barlow lens doubles the magnification of your eyepiece, bringing out finer details on the Moon's surface, resolving the cloud bands of Jupiter, or splitting tight double stars. The fully multi-coated (FMC) lenses ensure that as magnification increases, light transmission remains high and contrast is preserved, preventing the washed-out images common with lesser Barlows. While any 2x Barlow narrows the field of view, the SV137's optical design maintains image sharpness and clarity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure Fit: 1.25\" Barrel with Brass Ring and M42 Threads\u003c\/h3\u003e\n\u003cp\u003eBuilt from CNC-machined aluminum, the SV137 is designed for durability in the field. Its 1.25\" barrel features a non-marring brass compression ring that provides a secure, concentric grip on your eyepiece without scratching the barrel, unlike simple thumbscrew designs. For imagers, the top of the Barlow unscrews to reveal standard M42 T-threads, creating a solid, threaded connection to your camera for stable, focused shots.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SVBONY SV137 2X Barlow affect the view of Jupiter in my 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT (around 2000mm focal length), a 10mm eyepiece yields 200x magnification. Adding the SVBONY SV137 Barlow will double this to 400x, which is near the practical limit for that aperture. This increased power will make Jupiter's Great Red Spot and individual cloud bands much larger and more distinct, assuming atmospheric seeing conditions are stable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV137 Barlow Lens for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SV137 is ideal for planetary, lunar, and solar (with a proper telescope filter) imaging. The top section unscrews to reveal \u003cstrong\u003eM42 x 0.75 T-threads\u003c\/strong\u003e. This allows you to connect a DSLR or dedicated astronomy camera directly using a T-ring, effectively doubling your telescope's focal length and image scale to capture more detail on small targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the brass compression ring on the SV137 Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe brass compression ring provides a superior way to secure your 1.25\" eyepieces. When you tighten the thumbscrew, it presses the soft brass ring gently and uniformly against the eyepiece barrel. This prevents the set screw from directly digging into and scratching the barrel, preserving the condition of your eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV137 work with a small 70mm refractor for viewing the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. A 70mm refractor is an excellent instrument for lunar observing. Using the SV137 Barlow will double the magnification of your existing eyepieces, allowing you to zoom in on specific craters, rilles, and mountain ranges on the Moon's surface for a more detailed and immersive view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the optics in the SV137 Barlow fully multi-coated?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the SVBONY SV137 features \u003cstrong\u003efully multi-coated (FMC)\u003c\/strong\u003e lenses. This means all air-to-glass surfaces have multiple layers of anti-reflection coatings applied, which maximizes light transmission and enhances image contrast and brightness compared to optics that are only single-coated or partially coated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV137 compatible with all 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the SV137 is designed to work with any standard 1.25\" telescope eyepiece. Its brass compression ring ensures a secure fit for eyepieces of varying weights and designs without causing damage to their barrels.\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\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated (FMC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Threads\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocking Mechanism\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eCNC-Machined Aluminum\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\"\u003eSV137 1.25\" 2X Barlow Lens\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861235888413,"sku":"SV-W9106B","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV137-1-25-2X-FMC-Barlow-Lens-with-Brass-Ring-for-Telescope-1_759b1f1e-4174-455b-b203-80b0140b53d7.jpg?v=1788660156"},{"product_id":"svbony-sv137-3x-fmc-barlow-lens-125in","title":"SVBONY SV137 3X FMC Barlow Lens - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDoubles the magnification of any 1.25\" eyepiece\u003c\/li\u003e\n\u003cli\u003eFully multi-coated (FMC) lenses for maximum light transmission\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" barrel diameter fits all standard focusers\u003c\/li\u003e\n\u003cli\u003eCNC-machined aluminum body for durability\u003c\/li\u003e\n\u003cli\u003eInternal brass ring to protect eyepiece barrels from scratches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSVBONY SV137 1.25\" 2X FMC Barlow Lens\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV137 1.25\" 2X FMC Barlow Lens doubles the magnification of any 1.25\" eyepiece, effectively expanding your collection without the cost of new eyepieces. This simple and robust optical accessory is an essential tool for getting closer views of the Moon, planets, and tight double stars through virtually any telescope.\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\u003e2X Magnification Boost with Fully Multi-Coated Lenses\u003c\/h3\u003e\n\u003cp\u003eBy placing the SV137 Barlow between your eyepiece and focuser, you instantly get a 2X power increase. The fully multi-coated (FMC) lenses ensure that as magnification increases, light transmission remains high, preserving the brightness and contrast of the original image for sharp, clear views.\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\u003e1.25\" CNC Body with Brass Compression Ring\u003c\/h3\u003e\n\u003cp\u003eBuilt from a single piece of CNC-machined aluminum, the SV137 is designed for durability and precise alignment. Unlike basic models that use a thumbscrew to directly contact the eyepiece, this Barlow features an internal brass compression ring that provides a secure, mar-free grip, protecting the barrels of your 1.25\" eyepieces from scratches and sleeking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SVBONY SV137 2X Barlow affect my view of Jupiter in a 4\" refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 4\" f\/7 refractor, a 10mm eyepiece yields 70x magnification. Adding the SVBONY SV137 2X Barlow increases this to 140x, a much better scale for resolving Jupiter's main cloud bands and the Galilean moons. The fully multi-coated optics help maintain image brightness at this higher power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the brass compression ring on the SV137 Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003ebrass compression ring\u003c\/strong\u003e provides a significant advantage over simple set-screw designs. When you tighten the thumbscrew, the soft brass ring gently and evenly tightens around your eyepiece barrel. This prevents the screw from digging into and scratching the barrel, preserving the condition of your eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV137 Barlow work with all my 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the SVBONY SV137 is designed to work with any standard 1.25\" format eyepiece. It also fits any telescope focuser, diagonal, or accessory that accepts 1.25\" barrels, making it a universally compatible accessory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use the SVBONY SV137 2X Barlow instead of just a higher-power eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Barlow lens is an economical way to double the number of magnifications you have available. It's particularly useful for a few key reasons:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintaining Eye Relief:\u003c\/strong\u003e It allows you to achieve high power while using a longer focal length eyepiece, which typically has more comfortable eye relief.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging:\u003c\/strong\u003e Barlows are essential for increasing the image scale for planetary and lunar photography with webcams or dedicated astronomy cameras.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do the SV137's multi-coated lenses help when observing the Moon's craters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Moon is a very bright object, and internal reflections can reduce contrast, washing out fine details. The \u003cstrong\u003efully multi-coated (FMC)\u003c\/strong\u003e lenses on the SVBONY SV137 suppress these reflections, resulting in a darker background sky and higher contrast, which makes subtle features along the lunar terminator and inside crater walls stand out more clearly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between this SVBONY SV137 2X Barlow and a 3X Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 2X Barlow is more versatile and can be used on more nights of average atmospheric seeing. A 3X Barlow provides much higher magnification but requires very stable seeing conditions to provide a sharp image. The 2X is an excellent all-around choice, while a 3X is a more specialized tool for nights of exceptional stability or for use with long focal length telescopes.\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\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated (FMC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eCNC-Machined Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861235953949,"sku":"SV-W9106D","price":22.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV137-1-25-2X-FMC-Barlow-Lens-with-Brass-Ring-for-Telescope-1-W9106D_9ebb4e5d-12a7-458f-ac80-eee37f0eb10d.jpg?v=1788660168"},{"product_id":"svbony-sv216-2x-4-element-barlow-lens-125in","title":"SVBONY SV216 2X 4-Element Barlow Lens - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2x Magnification Factor\u003c\/li\u003e\n\u003cli\u003e4-Element Optical Design\u003c\/li\u003e\n\u003cli\u003e1.25 inch Barrel Size\u003c\/li\u003e\n\u003cli\u003e3-Screw Coaxial Clamping System\u003c\/li\u003e\n\u003cli\u003eFully Multicoated Lenses\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSVBONY SV216 1.25\" 2X 4-Element Barlow Lens for Planetary Astronomy\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV216 1.25\" Barlow Lens doubles your telescope's effective focal length using an advanced 4-element optical design to maintain a flat, sharp field of view. Its coaxial clamp utilizes 3 M3x10 thumbscrews for precise optical alignment, and the barrel's M28.5x0.6 threads accept standard 1.25\" filters for enhanced planetary contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e4-Element Optics: A Flat Field for 2x Magnification\u003c\/h3\u003e\n\u003cp\u003eUnlike standard 2-element Barlows, the SV216 uses a 4-element lens group to deliver superior optical correction. This design significantly reduces chromatic aberration and flattens the field, ensuring stars remain sharp points even at the edge of wide-angle eyepieces. Fully multicoated surfaces on all elements maximize light transmission for bright, high-contrast views of planetary details like Jupiter's Great Red Spot or the Cassini Division in Saturn's rings.\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\u003eCoaxial Alignment: The 3-Screw Clamping Mechanism\u003c\/h3\u003e\n\u003cp\u003eThe SV216 replaces the single-screw standard with a robust 3-screw clamping system. This design allows you to apply even pressure from multiple points, forcing the eyepiece barrel to align perfectly with the Barlow's optical axis. This coaxial alignment is critical for high-magnification imaging and viewing, preventing optical tilt that can soften an entire side of the image. A brass compression ring prevents the stainless steel thumbscrews from marring your eyepiece barrels.\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\u003eSV216 4-Element vs. Standard 2-Element Barlows\u003c\/h3\u003e\n\u003cp\u003eA standard 2-element achromatic Barlow, like a Celestron Omni, is often lighter and more affordable, making it a common entry-level choice. However, the optical and mechanical design of the SVBONY SV216 provides distinct advantages for serious planetary observation and imaging.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Correction:\u003c\/strong\u003e The SV216's 4-element design provides a flatter field, crucial for keeping details sharp across the larger sensors of modern planetary cameras or when using wide-field eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor Fidelity:\u003c\/strong\u003e By better controlling chromatic aberration, the SV216 minimizes distracting color fringing on bright targets like the lunar limb, Venus, and Jupiter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Centering:\u003c\/strong\u003e The 3-screw clamp of the SV216 offers superior optical alignment compared to the single-screw design common on most 2-element Barlows, preventing image-degrading tilt. The trade-off is weight; at 7.72oz (219g), the SV216 is substantially heavier and may require rebalancing your telescope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the SVBONY SV216's 4-element design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage of the \u003cstrong\u003e4-element design\u003c\/strong\u003e is superior optical correction compared to simpler 2-element Barlows. It produces a flatter field of view, meaning stars stay sharp closer to the edge, and it significantly reduces chromatic aberration (color fringing) on bright objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 3-screw clamp on the SVBONY SV216 improve views?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e3-screw clamp\u003c\/strong\u003e ensures your eyepiece or camera is held perfectly on the optical axis (coaxially). A single thumbscrew can push the eyepiece slightly to one side, creating tilt that degrades sharpness, especially at high magnification. The SV216's design provides even pressure for a more precise, stable optical train.\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 SVBONY SV216 Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel is threaded with standard \u003cstrong\u003eM28.5x0.6\u003c\/strong\u003e threads, allowing you to attach any standard 1.25\" filter. This is ideal for using color filters to enhance planetary features or a UV\/IR cut filter for imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV216 work well for imaging Jupiter with my 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An 8\" SCT has a focal length around 2000mm. The \u003cstrong\u003eSVBONY SV216 2x Barlow\u003c\/strong\u003e will double this to 4000mm (f\/20), providing the ideal image scale for capturing fine detail in Jupiter's cloud bands with most modern planetary cameras. The flat-field 4-element design will keep the planet sharp across the entire sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV216 a good match for wide-angle eyepieces in my fast Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent match. Fast telescopes (f\/4-f\/5) and wide-angle eyepieces are very demanding on optics. The \u003cstrong\u003eSV216's 4-element design\u003c\/strong\u003e provides the necessary correction to control aberrations like coma and astigmatism at the edge of the field, which would be amplified by a simpler Barlow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to rebalance my telescope with the SVBONY SV216?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMost likely, yes. The SVBONY SV216 weighs \u003cstrong\u003e7.72oz (219g)\u003c\/strong\u003e, which is significantly heavier than a standard eyepiece or a lightweight Barlow. You should expect to adjust your counterweights or tube position to maintain proper balance, especially on smaller mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully multicoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression Ring\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Material\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Type\u003c\/td\u003e\n\u003ctd\u003eStraight Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThumbscrews\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThumbscrew Thread\u003c\/td\u003e\n\u003ctd\u003eM3x10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsertion Depth\u003c\/td\u003e\n\u003ctd\u003e1.55 inch \/ 39.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength of Upper Body\u003c\/td\u003e\n\u003ctd\u003e2.34 inch \/ 59.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Diameter\u003c\/td\u003e\n\u003ctd\u003e1.73 inch \/ 44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e7.72 oz \/ 219 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861236805917,"sku":"SV-W9168A","price":70.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV216-1-25-2X-4-Element-Barlow-Lens-for-Planetary-Astronomy-1_161fcb3c-059d-402a-82aa-b9880252a975.jpg?v=1788883577"},{"product_id":"baader-planetarium-ffc-all-in-one-t-2-set-3-4x-magnification-for-1-25-inch-and-t-2-cameras","title":"Baader Planetarium FFC All-in-One T-2 Set – 3–4x magnification for 1.25\" and T-2 cameras","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eVariable Magnification: 3x to 8x+\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-Element with 2x CaF2 Fluorite Lenses\u003c\/li\u003e\n\u003cli\u003eImage Circle: 90mm Flat Field at 4x Magnification\u003c\/li\u003e\n\u003cli\u003eSet Magnification Range: 3x to 4x\u003c\/li\u003e\n\u003cli\u003eConnectivity: Baader T-2 System\u003c\/li\u003e\n\u003cli\u003eCompatibility: 1.25\" Eyepieces and T-2 Threaded Cameras\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\u003eFFC All-in-One T-2 Set – 3–4x magnification for 1.25\" and T-2 cameras\u003c\/h2\u003e\n\u003cp\u003eThe Baader Fluorite-Flatfield-Converter (FFC) All-in-One T-2 Set is an uncompromising projection system, built around a 4-element optical core that includes two genuine fluorite (CaF2) crystals to achieve unparalleled sharpness. It delivers a variable magnification from 3x up to 8x, producing a perfectly flat field across a massive 90mm image circle at its optimal 4x setting. This complete set provides all the necessary T-2 adapters to achieve a 3x to 4x magnification range with both 1.25\" eyepieces and T-2 threaded cameras.\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 4-Element, Dual-Fluorite Design for Ultimate Sharpness\u003c\/h3\u003e\n\u003cp\u003eDeveloped in 1997 with a designer of the legendary Zeiss APQ lenses, the FFC was conceived as the ultimate projection system for high-resolution imaging. Its 4-element, 2-group design incorporates two calcium fluorite (CaF2) lenses—an extreme glass type that enables apochromatic correction across a very broad spectral range. The result is a uniquely transparent and sharp optical system with a claimed line resolution ten times that of a Zeiss Abbe eyepiece.\u003c\/p\u003e\n\u003cp\u003eWhile extremely difficult to produce and coat, the fluorite elements are the key to the FFC's performance. For planetary, lunar, and solar imagers, this design translates to the highest possible contrast and resolution, capturing details limited only by your telescope and atmospheric seeing.\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\u003eVariable 3x–8x Magnification Across a 90mm Flat Field\u003c\/h3\u003e\n\u003cp\u003eThe FFC's magnification is not fixed; it is determined by the distance between the optics and the focal plane of your eyepiece or camera sensor. This set includes the necessary T-2 extension tubes to achieve approximately 3x magnification at a 96mm distance and 4x at a 150mm distance. With additional T-2 extensions (sold separately), magnification can be pushed to 8x and beyond.\u003c\/p\u003e\n\u003cp\u003eAt its design-optimized 4x magnification, the FFC projects a tack-sharp, completely flat image across an enormous 90mm circle. This fully illuminates even the largest commercially available astronomy camera sensors without compromise, making it a definitive choice for imagers who require perfect edge-to-edge performance on large-format chips.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe All-in-One T-2 System for 1.25\" Eyepieces and Cameras\u003c\/h3\u003e\n\u003cp\u003eThis set integrates the FFC optic into Baader's Astro T-2 System, providing a complete solution for both visual and photographic use. Two included T-2 quick changers allow you to instantly switch between an eyepiece and a camera, or swap between different extension tube configurations for different magnifications. The system is built around these key components:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eT-2 Extension Tubes:\u003c\/strong\u003e These are used to precisely set the optical distance required to achieve your desired magnification between 3x and 4x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader ClickLock Clamp:\u003c\/strong\u003e Securely holds any 1.25\" eyepiece or accessory with a simple twist, preventing slippage or marring of barrels, even with heavy equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT-2 Quick Changers:\u003c\/strong\u003e Allow for rapid changes between imaging and visual setups and provide a point of rotation for camera framing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" Nosepiece:\u003c\/strong\u003e Provides the necessary optical path length to reach focus in most telescopes without requiring a star diagonal.\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\u003eHandling CaF2: Acclimatizing from +20°C to -20°C\u003c\/h3\u003e\n\u003cp\u003eThe FFC's exceptional optical properties are due to its genuine fluorite lenses, which are sensitive to thermal shock. Sudden, large temperature changes can cause stress within the crystal. You must not take the FFC directly from a warm +20°C house into an icy -20°C winter night without allowing it to acclimate slowly.\u003c\/p\u003e\n\u003cp\u003eTo prevent damage, the FFC's transport case is designed to act as a thermal buffer. When setting up your telescope, leave the FFC in its closed case for up to an hour to allow it to cool down gradually with the ambient air. This simple procedure protects the sensitive optics and ensures a lifetime of uncompromising performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Baader FFC different from a standard Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader FFC is a more complex optical system designed as a flat-field apochromatic projector, not a simple magnifier. It uses \u003cstrong\u003efour lens elements, including two fluorite (CaF2) crystals\u003c\/strong\u003e, to deliver exceptional sharpness across a very wide, flat 90mm image circle. Standard Barlows typically use two or three non-fluorite lenses and are not corrected for a large, flat field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I change the magnification with the FFC All-in-One T-2 Set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou change magnification by altering the distance from the FFC optics to your camera sensor or eyepiece. The \u003cstrong\u003eBaader FFC All-in-One T-2 Set includes a system of T-2 extension tubes\u003c\/strong\u003e to accomplish this. For approximately \u003cstrong\u003e3x magnification, you need a distance of 96mm\u003c\/strong\u003e, and for \u003cstrong\u003e4x, a distance of 150mm\u003c\/strong\u003e. The included T-2 quick changers allow you to easily swap between different extension tube combinations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader FFC All-in-One Set with my large-format camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The Baader FFC is specifically designed for this purpose. At its optimal 4x magnification, it produces a \u003cstrong\u003eperfectly flat, fully illuminated 90mm image circle\u003c\/strong\u003e. This is large enough to cover the biggest astronomy sensors on the market with no vignetting or loss of edge sharpness, making it an ideal choice for serious imagers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is there a special warning about temperature for the Baader FFC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader FFC's two \u003cstrong\u003efluorite (CaF2) lenses are sensitive to thermal shock\u003c\/strong\u003e. A rapid change in temperature (e.g., from a warm house to a freezing night) can cause internal stress in the lens elements. To protect the optics, you must allow the FFC to acclimate slowly inside its protective case for up to an hour before use in extreme temperature differences.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the T-2 quick changers in the FFC All-in-One Set allow me to do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe two T-2 quick changers provide significant operational flexibility. They allow you to:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstantly switch between a visual setup (with the 1.25\" ClickLock) and an imaging setup (with a T-2 camera).\u003c\/li\u003e\n\u003cli\u003eEasily rotate your camera for perfect framing without loosening any threaded connections.\u003c\/li\u003e\n\u003cli\u003eQuickly swap between pre-assembled stacks of extension tubes to change magnification factors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the Baader FFC All-in-One Set for high-resolution imaging of Jupiter with my T-2 planetary camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor imaging Jupiter with a planetary camera, you would assemble the Baader FFC and T-2 extension tubes to achieve a focal ratio between f\/20 and f\/25. You would start by inserting the 2\" nosepiece into your telescope's focuser, followed by the FFC housing. Then, you would add T-2 extension tubes to reach the ~150mm distance for 4x magnification (or adjust as needed) before attaching your T-2 camera. The T-2 quick changer allows you to easily rotate the camera to align with Jupiter's cloud belts.\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\u003eMagnification Range (System)\u003c\/td\u003e\n\u003ctd\u003e3x – 8x+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Range (Included Set)\u003c\/td\u003e\n\u003ctd\u003e3x – 4x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-Element \/ 2-Group Fluorite-Flatfield-Converter (FFC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKey Optical Elements\u003c\/td\u003e\n\u003ctd\u003e2x Calcium Fluorite (CaF2) Lenses\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIlluminated Field (at 4x)\u003c\/td\u003e\n\u003ctd\u003e90 mm (Flat Field)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Connectivity\u003c\/td\u003e\n\u003ctd\u003eBaader Astro T-2 System, 2\" Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003e1.25\" Eyepieces, T-2 Threaded Cameras\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eGermany\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e-54, 797 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003eHigh transmission multi-coated (HT-MC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreaded for filters\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm)\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\/Baader_Planetarium_FFC_All-in-One_T-2_Set_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\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_FFC_All-in-One_T-2_Set_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium FFC All-in-One T-2 Set Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":52913247093021,"sku":"BAA-2458281","price":1449.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-FFC-All-in-One-T-2-Set-3-4x-magnification-for-1-and-T-2-cameras-1_bb0cb326-81b5-48a5-a158-e986fad03e35.jpg?v=1789088679"},{"product_id":"daystar-combo-quark-4-3x-telecentric-barlow","title":"Daystar Combo QUARK 4.3X Telecentric Barlow","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e4.3X Telecentric Barlow\u003c\/li\u003e\n\u003cli\u003eOptimized for Daystar Combo Quark H-alpha Filters\u003c\/li\u003e\n\u003cli\u003eDesigned for F\/5 to F\/9 Refractors\u003c\/li\u003e\n\u003cli\u003eMaximizes Surface Contrast\u003c\/li\u003e\n\u003cli\u003eEnables Full-Disk Views on Scopes ~480mm or Shorter\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\u003eDaystar Combo QUARK 4.3X Telecentric Barlow\u003c\/h2\u003e\n\u003cp\u003eThe Daystar Combo QUARK 4.3X Telecentric Barlow is a custom-engineered optical amplifier designed to optimize Daystar's H-alpha filters for refractors from F\/5 to F\/9. By establishing a truly telecentric light path at a 4.3X magnification, it narrows the filter's effective bandpass to achieve maximum surface contrast, making it ideal for full-disk solar views in telescopes with focal lengths of approximately 480mm or shorter.\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 4.3X Telecentric Design for Optimal Quark Bandpass\u003c\/h3\u003e\n\u003cp\u003eA Hydrogen-alpha etalon performs best when fed with parallel light rays. This 4.3X barlow is a fully baffled, telecentric design engineered specifically for the Combo Quark, ensuring the light cone entering the filter is properly conditioned for the highest uniformity and contrast. Installation is direct: simply unscrew the silver snout from your Combo Quark and thread the 4.3X barlow in its place to transform your optical 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\u003eThe 480mm Full-Disk Limit: Trading Field for Surface Contrast\u003c\/h3\u003e\n\u003cp\u003eThis amplifier prioritizes solar surface detail above all else. The aggressive 4.3X magnification results in a narrower filter bandpass, which significantly enhances the visibility of fine structures like plage and filaments against the chromosphere. The trade-off for this heightened contrast is a dimmer image and a more restricted field of view, limiting full-disk captures to telescopes with focal lengths of around 480mm or less.\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\u003eDaystar 4.3X vs. 2.8X Barlow: Choosing Your Imaging Strategy\u003c\/h3\u003e\n\u003cp\u003eDaystar offers two telecentric options for the Combo Quark, each suited to different imaging goals. Your choice depends on your telescope's focal length and whether your priority is surface detail or prominence brightness.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.8X Telecentric Barlow:\u003c\/strong\u003e This is the preferred choice for a brighter image and for achieving full-disk views on longer focal length refractors. Its less aggressive amplification is better suited for capturing fainter prominence details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4.3X Telecentric Barlow:\u003c\/strong\u003e Select this model for maximum surface contrast with short focal length refractors (under 480mm). If your goal is to resolve the finest, high-contrast details within the solar disk itself, the 4.3X provides the narrowest bandpass.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the Daystar Combo QUARK 4.3X Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation is straightforward. You simply \u003cstrong\u003eunscrew the standard silver snout\u003c\/strong\u003e from the front of your Daystar Combo Quark H-alpha filter and then \u003cstrong\u003escrew the 4.3X Telecentric Barlow\u003c\/strong\u003e on in its place. No other adapters are needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I choose the Daystar Combo QUARK 4.3X Barlow instead of the 2.8X version?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose the \u003cstrong\u003e4.3X Barlow\u003c\/strong\u003e when your primary goal is achieving the highest possible \u003cstrong\u003esurface contrast\u003c\/strong\u003e on the Sun's disk, and you are using a short focal length refractor (around 480mm or less). The 2.8X version is better for brighter images, capturing faint prominences, and for use with longer focal length telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I get a full-disk view of the Sun with the Daystar 4.3X Barlow and my 700mm focal length refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it is unlikely. The Daystar 4.3X Barlow is designed to provide a full-disk view on telescopes with a focal length of approximately \u003cstrong\u003e480mm or shorter\u003c\/strong\u003e. On a 700mm telescope, this barlow would provide a high-magnification view of a smaller region of the solar surface, not the entire disk.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"telecentric\" mean for my Daystar QUARK filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA telecentric optical system produces parallel rays of light. Daystar's QUARK H-alpha filters require this parallel light to perform optimally, achieving a consistent and narrow filter bandpass across the entire field of view. Using a telecentric barlow like the 4.3X ensures your telescope's converging light cone is properly conditioned before it reaches the filter's sensitive etalon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Daystar 4.3X Barlow good for imaging solar prominences with my F\/8 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can image prominences, the 4.3X Barlow is optimized for high-contrast surface detail, which comes at the expense of image brightness. Since prominences are much fainter than the solar disk, the \u003cstrong\u003e2.8X Barlow\u003c\/strong\u003e is generally the better choice for capturing them, as it provides a brighter image. The 4.3X excels at revealing texture in filaments and plage on the disk itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Daystar Combo QUARK 4.3X Barlow make my solar image dimmer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Compared to the 2.8X telecentric barlow, the 4.3X version will produce a dimmer image. This is a direct trade-off for achieving a narrower filter bandpass, which is what enhances the visible contrast of surface features on the Sun.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/daystar-filters-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eDaystar Filters Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Daystar Filters","offers":[{"title":"Default Title","offer_id":52935164657949,"sku":"DAY-CC43B","price":419.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/DaystarFilters-Daystar-Combo-QUARK-4-3X-Telecentric-Barlow-1_67022a42-8522-4c68-acc5-45467035352c.jpg?v=1789520765"}],"url":"https:\/\/davidastro.com\/fr\/collections\/barlows-and-extenders.oembed?page=2","provider":"David Astro","version":"1.0","type":"link"}