{"title":"Accessoires de porte-oculaire TeleVue","description":"\u003cp\u003eLes accessoires de porte-oculaire TeleVue aident à atteindre la mise au point avec différents oculaires, caméras et renvois coudés. Les tubes allonges 2\" de 2\" et 3.5\" de long et la rallonge de coulant 2\" ajoutent du tirage quand un accessoire n'arrive pas au point.\u003c\/p\u003e\u003cp\u003eL'adaptateur 2.4\" pour accessoires 2\" permet d'utiliser du matériel 2\" standard sur un porte-oculaire TeleVue 2.4\", et le Focusmate Driver 10:1 offre une mise au point plus fine pour le fort grossissement et l'imagerie.\u003c\/p\u003e","products":[{"product_id":"tele-vue-extension-tube-2-inch","title":"Tele Vue 2\" Extension Tube - 2\" Length","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eExtension Length: 2 inches (50.8mm)\u003c\/li\u003e\n\u003cli\u003eBarrel Diameter: 2 inches\u003c\/li\u003e\n\u003cli\u003eLocking Mechanism: Brass clamp ring with single thumbscrew\u003c\/li\u003e\n\u003cli\u003eSafety Feature: Undercut groove\u003c\/li\u003e\n\u003cli\u003eMaterial: Anodized aluminum body, brass ring\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\u003eReach Focus with Confidence: The Tele Vue 2\" Extension Tube\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 2\" Extension Tube (TV-X2C-0008) is a fundamental problem-solver for observers and imagers who need to add extra outward travel to their 2-inch focuser. It provides a fixed 2-inch (50.8mm) path extension, enabling you to achieve a sharp focus with accessories that have a long back-focus requirement or when using a telescope with limited focuser travel.\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\u003eAchieve Necessary Outward Focuser Travel\u003c\/h3\u003e\n\u003cp\u003eMany modern accessories, particularly coma correctors, focal reducers, and certain long focal length eyepieces, require the focuser to be racked further out than some telescopes allow. This extension tube provides the precise 2-inch spacing needed to bring these accessories into the focal plane. Its fixed length is a simple, rigid solution that introduces no flexure or alignment issues into your optical train.\u003c\/p\u003e\n\u003cp\u003eFor visual observers, this means you can finally use that favorite low-power, 2-inch eyepiece that just wouldn't come to focus in your reflector. For imagers, it provides the critical distance needed to place a camera sensor at the correct operational distance from a flattener or reducer, ensuring a sharp, well-corrected field from edge to edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure, Non-Marring Brass Clamp Ring\u003c\/h3\u003e\n\u003cp\u003eThe core of the Tele Vue extension tube's design is its non-marring brass clamp ring. When you tighten the thumbscrew, it presses on this soft, continuous ring rather than digging directly into the barrel of your eyepiece or camera nosepiece. This mechanism distributes the pressure evenly around the barrel for a more secure, centered lock.\u003c\/p\u003e\n\u003cp\u003eThe direct benefit is the complete elimination of gouges and scratches on your expensive accessories. The single, oversized thumbscrew is easy to manipulate even with gloves on, providing a firm grip without requiring excessive force. This preserves the value and cosmetic condition of your gear while ensuring a solid connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUndercut Safety Groove for Equipment Security\u003c\/h3\u003e\n\u003cp\u003eA common point of failure in any optical train is an accessory slipping out of a focuser or diagonal. Tele Vue addresses this with a machined undercut safety groove on the barrel. This groove provides a catch for the thumbscrew of your focuser, preventing the extension tube, and anything attached to it, from falling to the ground if the screw loosens slightly.\u003c\/p\u003e\n\u003cp\u003eThis small detail provides significant peace of mind, especially when you have a heavy eyepiece or a valuable camera attached. It’s a simple mechanical feature that protects your investment against an accidental slip, letting you observe or image with greater confidence.\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 a Lifetime of Use\u003c\/h3\u003e\n\u003cp\u003eLike all Tele Vue accessories, the TV-X2C-0008 is built to a standard, not a price. The main body is machined from solid aluminum and anodized for a durable, scratch-resistant finish. The internal surfaces are blackened to absorb stray light, which helps maintain maximum contrast in your field of view by preventing off-axis reflections.\u003c\/p\u003e\n\u003cp\u003eThis isn't an accessory you'll need to replace. Its robust construction ensures that it will maintain perfect alignment and function reliably for years, session after session. It's a small but essential part of the imaging or observing chain that upholds the quality of the components around it.\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\"\u003eWhen do I need a 2-inch extension tube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need an extension tube when your eyepiece or camera cannot reach focus because your telescope's focuser runs out of outward travel. This is common in Newtonian reflectors when switching from visual use to imaging, or when using accessories like Barlows or coma correctors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this extension tube cause vignetting?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its 2-inch clear aperture, the Tele Vue extension tube is designed to prevent vignetting with most eyepieces and sensors up to full-frame size (35mm format). Its internal baffling further ensures that off-axis light does not reduce image contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy use a fixed extension tube instead of a variable one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA fixed extension tube like the Tele Vue TV-X2C-0008 provides superior rigidity and maintains perfect optical alignment. Variable extensions can sometimes introduce flex or tilt, which can degrade image quality, especially in demanding imaging applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the brass clamp ring work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe thumbscrew pushes against a soft brass ring inside the barrel, which then gently and evenly grips your accessory. This prevents the screw from directly scarring the barrel of your eyepiece or camera nosepiece, preserving its condition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this compatible with 1.25\" accessories?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can use 1.25\" accessories with this extension tube by inserting a standard 2\" to 1.25\" adapter into it. The brass clamp ring will securely hold the adapter in place.\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 Number\u003c\/td\u003e\n\u003ctd\u003eTV-X2C-0008\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\u003eExtension Length\u003c\/td\u003e\n\u003ctd\u003e2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocking Mechanism\u003c\/td\u003e\n\u003ctd\u003eBrass Clamp Ring with Single Thumbscrew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e4.8 oz (136g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized Aluminum, Brass\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\" Extension Tube\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\/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":51223880499485,"sku":"TV-X2C-0008","price":109.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Extension_Tube_2in_1.jpg?v=1777515021"},{"product_id":"tele-vue-extension-tube-3-5-inch","title":"Tele Vue 2\" Extension Tube - 3.5\" Length","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eExtension Length: 3.5\" (89mm)\u003c\/li\u003e\n\u003cli\u003eTelescope Connection: 2\" Barrel\u003c\/li\u003e\n\u003cli\u003eAccessory Connection: 2\" Barrel\u003c\/li\u003e\n\u003cli\u003eMaterial: Anodized Aluminum\u003c\/li\u003e\n\u003cli\u003eInternal Finish: Matte Black, Baffled\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\u003eAchieve Perfect Focus with this 3.5\" Extension Tube\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Extension Tube - 3.5\" is a precision-machined 2-inch barrel extender designed to solve common back-focus issues in complex imaging and visual setups. It provides a rigid, non-flexing 89mm extension, allowing you to reach focus when your focuser's drawtube travel is insufficient for your accessory train. This component is essential for observers and imagers who use accessories like Barlows, focal reducers, or off-axis guiders that alter the focal plane.\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\u003eFixed 3.5\" (89mm) Optical Extension\u003c\/h3\u003e\n\u003cp\u003eThis extension tube provides a fixed 3.5 inches (89mm) of outward travel for your focuser. This specific length is often required when using certain accessories, like a Tele Vue Paracorr with a DSLR or specific eyepiece combinations on refractors that have limited focuser travel. Using a fixed tube provides a more rigid and stable connection than stacking multiple smaller extenders, which can introduce flexure and tilt into the optical path.\u003c\/p\u003e\n\u003cp\u003eThe primary benefit is achieving focus where it was previously impossible. For imagers, this means bringing your camera sensor to the precise focal plane required for sharp stars across the frame. For visual observers, it allows the use of long focal length eyepieces or Barlow lenses that would otherwise remain blurry.\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\u003eStandard 2\" Barrel Interfaces for Universal Fit\u003c\/h3\u003e\n\u003cp\u003eThe Tele Vue X3C-0009 is engineered for broad compatibility across the Tele Vue ecosystem and with standard 2-inch accessories. The male end is a standard 2-inch barrel that inserts securely into your telescope's focuser or diagonal, held in place by your existing compression rings or setscrews. The female end accepts any standard 2-inch accessory, from eyepieces to camera nosepieces.\u003c\/p\u003e\n\u003cp\u003eThis universal fit eliminates guesswork. You can confidently integrate it into your existing collection of 2-inch gear without worrying about proprietary threads or adapters. The machined shoulders ensure that accessories seat squarely, which is critical for maintaining optical alignment and preventing image degradation.\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\u003eInternal Baffling for Maximum Image Contrast\u003c\/h3\u003e\n\u003cp\u003eAn extension tube is more than just a spacer; it is an active part of your optical train. The interior of the Tele Vue 3.5\" Extension Tube is machined with anti-reflection threads and finished in a deep matte black. This treatment acts as a light baffle, trapping off-axis stray light that could otherwise reflect off the inner walls and reach your eyepiece or sensor.\u003c\/p\u003e\n\u003cp\u003eThe direct visual consequence is higher contrast. By preventing internal reflections, the background sky in your images remains darker, and subtle details in faint nebulae or galaxies are not washed out. This commitment to stray light control is a core principle of Tele Vue design and ensures that adding this extender does not compromise the performance of your primary optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Critical Note on Telescope Balance\u003c\/h3\u003e\n\u003cp\u003eWhile providing a crucial function, adding an 89mm extension and a heavy accessory to the back of your telescope significantly shifts the center of gravity. This is the product's main trade-off. Before use, you must ensure your telescope is properly re-balanced on its mount to prevent tracking errors or, in extreme cases, unwanted slewing.\u003c\/p\u003e\n\u003cp\u003eFor observers with smaller mounts, this added leverage may require additional counterweights or shifting the optical tube assembly forward in its rings. Properly balancing the system is not just a recommendation; it is essential for maintaining the stability and tracking accuracy of your entire setup, particularly for long-exposure 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\u003eIs This the Right Extension Tube For You?\u003c\/h3\u003e\n\u003cp\u003eThis 3.5\" extension tube is the right choice when you have a significant focus shortfall, typically encountered when adapting imaging systems or using specific Barlow\/eyepiece combinations. It is for the observer who needs a robust, single-piece solution to bridge a large gap in focuser travel without introducing flex.\u003c\/p\u003e\n\u003cp\u003eIf you only need a small amount of extension (less than 2 inches), Tele Vue offers shorter tubes that may be a better fit and have less impact on balance. However, when your camera or eyepiece simply won't come to focus and you have inches to go, the X3C-0009 is the specific, high-quality tool designed to solve that exact problem.\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\"\u003eWhen do I need a 3.5\" extension tube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need an extension tube when your focuser runs out of outward travel before your eyepiece or camera reaches focus. This often happens with refractors when observing straight-through (no diagonal) or when adding accessories like a focal reducer or off-axis guider to an imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this extension tube cause vignetting?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its 2-inch diameter, this tube is designed to pass the full light cone for sensors up to full-frame (35mm format) and any 2-inch eyepiece without causing vignetting. It will not be the limiting factor in your optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs it better to use one long tube or stack several short ones?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOne long, rigid tube is always better. Stacking multiple shorter extension tubes creates more connection points, which can lead to flexure and tilt in the optical path, degrading image quality. The 3.5\" tube provides a single, solid connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this affect my telescope's balance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAdding this tube pushes your eyepiece or camera further back, shifting the center of gravity. You will need to re-balance your telescope by sliding the optical tube forward in its rings or by adding more counterweights to ensure proper tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Tele Vue 3.5\" extension have filter threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this extension tube does not typically have threads for 2-inch filters. Filters should be placed on the nosepiece of your camera or on the barrel of your eyepiece before inserting them into the extension tube.\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 Number\u003c\/td\u003e\n\u003ctd\u003eX3C-0009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtension Length\u003c\/td\u003e\n\u003ctd\u003e3.5 inches (89mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Diameter\u003c\/td\u003e\n\u003ctd\u003e2 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003e2\" Male Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Side Connection\u003c\/td\u003e\n\u003ctd\u003e2\" Female Barrel with compression lock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Design\u003c\/td\u003e\n\u003ctd\u003eAnti-reflection threaded and blackened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApprox. 6.4 oz (181 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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 3.5\" Extension Tube - 2\"\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\/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":51223880532253,"sku":"TV-X3C-0009","price":109.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Extension_Tube_3.5in_1.jpg?v=1777515021"},{"product_id":"tele-vue-eyepiece-barrel-extension-2-inch","title":"Tele Vue 2\" Eyepiece Barrel Extension - 1.2\" Length","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds 1.2\" (30.5mm) of Extension\u003c\/li\u003e\n\u003cli\u003eFor 2\" Focusers and Accessories\u003c\/li\u003e\n\u003cli\u003eNon-Marring Brass Clamp Ring\u003c\/li\u003e\n\u003cli\u003eDual Thumbscrews for Secure Lock\u003c\/li\u003e\n\u003cli\u003eAccepts Standard 2\" (48mm) Filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\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\u003eSolve Focuser Travel Issues with the Tele Vue 2\" Barrel Extension\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 2\" Eyepiece Barrel Extension (EBX-2120) is a precision-machined component designed for a single, critical task: solving the problem of insufficient focuser out-travel. When your telescope's focuser cannot extend far enough to bring an eyepiece or camera to a sharp focus, this extension provides the 1.2 inches of additional path length needed to achieve a perfect image. It is an essential tool for observers who use a variety of eyepieces or engage in imaging with different optical trains.\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\u003eAchieve Focus Where It Was Previously Impossible\u003c\/h3\u003e\n\u003cp\u003eCertain eyepiece designs, particularly those with focal planes deep inside their barrels, may require more outward travel than your telescope's focuser can provide. This is a common scenario in Newtonian reflectors and some refractors when switching between different accessory families. The EBX-2120 provides a fixed, rigid 1.2\" (30.5mm) of extension, bridging that gap and bringing otherwise unusable eyepieces into sharp, clear view across the entire field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eProtect Your Equipment with a Brass Clamp Ring\u003c\/h3\u003e\n\u003cp\u003eStandard extension tubes often use a simple set screw that bites directly into the barrel of your expensive eyepieces, leaving unsightly and damaging marks. Tele Vue avoids this entirely by incorporating a non-marring brass clamp ring. As you tighten the thumbscrews, this internal ring compresses evenly around your accessory, providing a secure, centered grip without ever scratching the barrel's surface, preserving the condition and value of your optical 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\u003eEliminate Tilt with a Dual-Screw Design\u003c\/h3\u003e\n\u003cp\u003eA single set screw can push an eyepiece or camera slightly off-axis, introducing tilt that degrades edge-of-field performance. The EBX-2120 uses two large, knurled thumbscrews positioned opposite each other. This dual-screw system applies uniform pressure to the internal brass ring, ensuring your eyepiece or imaging sensor remains perfectly centered and parallel to the optical axis for the sharpest possible 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\u003eIntegrate Filters Seamlessly into Your Optical Path\u003c\/h3\u003e\n\u003cp\u003eAdding an extension to your setup shouldn't complicate your workflow for using filters. The base of the EBX-2120 is threaded to accept standard 2\" (48mm) astronomy filters. This allows you to add a nebula, light pollution, or color filter to the optical train without needing a separate filter cell or changing the spacing you have carefully established, keeping your setup simple and efficient.\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\u003eFrom Frustration to Perfect Focus\u003c\/h3\u003e\n\u003cp\u003eImagine you are hunting for the Veil Nebula, and you insert a low-power, wide-field eyepiece to frame the view. You turn the focus knob outwards, and it hits its physical stop just before the stars snap into focus. Instead of a night of compromise, you insert the Tele Vue Barrel Extension. The focuser now has ample range, and with a small adjustment, the faint, ghostly filaments of the nebula resolve into sharp, delicate threads against a dark background, turning a moment of frustration into a successful observation.\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\u003eAn Essential and Targeted Solution\u003c\/h3\u003e\n\u003cp\u003eWhile this component is a definitive solution for a known spacing issue, its fixed length is its primary trade-off. It is not designed to be a variable or tunable extender for complex imaging trains where precise, unknown back-focus distances must be dialed in. The EBX-2120 is for the observer who knows they need about an inch of extra travel to make their favorite eyepiece or simple imaging setup work perfectly with their telescope.\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\"\u003eWhen do I actually need an eyepiece extension tube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need an extension tube when your telescope's focuser runs out of outward travel before your eyepiece can reach focus. This often happens in Newtonian reflectors with low-profile focusers or when using certain eyepieces or accessories that have a long inward focal position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Tele Vue extension cause my eyepiece to tilt?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it is specifically designed to prevent tilt. The dual thumbscrews and internal brass clamp ring work together to apply even, centered pressure, holding your eyepiece securely and parallel to the optical axis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is this better than just not pushing my eyepiece in all the way?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLeaving an eyepiece partially seated in the focuser creates a sloppy, insecure connection that is prone to tilting and can easily fall out. The EBX-2120 provides a solid, rigid, and perfectly aligned extension of the focuser barrel for a secure and optically precise setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with the EBX-2120?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the bottom of the extension tube is threaded to accept standard 48mm filters, commonly known as 2\" filters. You can attach your filter directly to the extension before inserting it into the focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this work for imaging with my DSLR or planetary camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, if your camera requires more out-travel to reach focus, this extension will work perfectly. The secure, non-tilting grip is especially important for imaging to maintain a flat, evenly focused field.\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 Number\u003c\/td\u003e\n\u003ctd\u003eEBX-2120\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\u003eExtension Length\u003c\/td\u003e\n\u003ctd\u003e1.2\" (30.5mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping Mechanism\u003c\/td\u003e\n\u003ctd\u003eBrass Clamp Ring with Dual Thumbscrews\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\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized 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\"\u003eTele Vue 2\" Eyepiece Barrel Extension\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\/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":51223880565021,"sku":"TV-EBX-2120","price":55.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Eyepiece_Barrel_Extension_2in_1.jpg?v=1777515022"},{"product_id":"tele-vue-2-4-inch-adapter-for-2-inch-accessories","title":"Tele Vue 2.4\" Adapter for 2\" Accessories","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnection Side 1: 2.4\" Female Thread for Tele Vue NPis Focusers\u003c\/li\u003e\n\u003cli\u003eConnection Side 2: 2\" Accessory Barrel with Brass Clamp Ring\u003c\/li\u003e\n\u003cli\u003eMaterial: Anodized Aluminum\u003c\/li\u003e\n\u003cli\u003eThumbscrews: Two for secure locking\u003c\/li\u003e\n\u003cli\u003eOptical Length: 1.2\" (30.5mm)\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\u003eUnlock Your Tele Vue Imaging System with 2\" Accessories\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue A2A-1107 2.4\" Adapter for 2\" Accessories is the essential component for connecting standard 2-inch diagonals, eyepieces, and accessories to your Tele Vue NP101is or NP127is telescope. This meticulously machined adapter provides a secure, non-marring connection, ensuring your optical train remains perfectly aligned while preserving precious back focus for imaging configurations.\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 Rock-Solid Focuser Connection\u003c\/h3\u003e\n\u003cp\u003eThis adapter features a large 2.4-inch female thread designed to mate directly and securely with the drawtube of Tele Vue's \"is\" series imaging system focusers. This robust, wide-diameter connection provides a significant advantage over standard 2-inch nosepieces by eliminating the potential for tilt or flexure. The result is a more rigid and reliable foundation for both heavy visual accessories and demanding imaging trains.\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\u003eBarrel Protection with a Brass Clamp Ring\u003c\/h3\u003e\n\u003cp\u003eInside the adapter, a soft brass clamp ring provides the actual grip on your 2-inch accessories. When you tighten the thumbscrews, this ring compresses evenly around the barrel of your eyepiece or diagonal. This mechanism prevents the deep scratches and gouges that can be caused by adapters where the steel thumbscrew makes direct contact, preserving the value and finish of your premium accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDual Thumbscrews for Secure Locking\u003c\/h3\u003e\n\u003cp\u003eTwo large, knurled thumbscrews are positioned to apply balanced pressure to the internal brass clamp ring. This dual-screw design ensures that your accessory is held firmly and centered within the adapter. For heavy components like a 2-inch diagonal with a large eyepiece, or a full-frame camera setup, this provides an extra measure of security against rotation or slippage as the telescope moves across the sky.\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\u003ePlanning Your Back Focus\u003c\/h3\u003e\n\u003cp\u003eEvery millimeter of back focus is critical in an imaging setup, and the A2A-1107 is engineered with this reality in mind. It takes up 1.2 inches (30.5mm) of path length, so include it when you work out the spacing for filter wheels, off-axis guiders and other imaging components. This efficiency makes it the primary choice for observers who switch between visual observing and astrophotography with their NPis 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\u003eSeamless Integration into the Tele Vue Ecosystem\u003c\/h3\u003e\n\u003cp\u003eThis adapter is more than just a mechanical part; it is a key that unlocks the full versatility of your Tele Vue NPis telescope. It allows you to use the finest 2-inch accessories from any manufacturer, from wide-field eyepieces for sweeping views of the Milky Way to planetary cameras for high-magnification imaging. The precise machining ensures that the optical axis is maintained, a critical factor for achieving the sharp, field-wide performance these telescopes are known for.\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\u003eLimitations and Best Use Case\u003c\/h3\u003e\n\u003cp\u003eWhile essential for using 2-inch accessories, this adapter is a dedicated component for Tele Vue's 2.4-inch imaging system focusers found on NPis models. It is not a universal adapter and will not fit standard SCT threads or other focuser types. It is the right choice specifically for NPis owners who need to integrate 2-inch diagonals, eyepieces, or imaging components that use a standard 2-inch nosepiece into their setup.\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\"\u003eWill this adapter fit my non-Tele Vue telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is designed specifically for the 2.4-inch thread on Tele Vue NP101is and NP127is telescope focusers. It is not compatible with standard 2-inch focusers or Schmidt-Cassegrain threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy use this adapter instead of a standard 2\" visual back?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe A2A-1107's large 2.4-inch threaded connection provides a more rigid and secure attachment to the focuser drawtube, preventing tilt that can be an issue with slip-fit adapters, especially with heavy equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the adapter prevent scratches on my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. It uses an internal brass clamp ring that tightens around the accessory barrel. This prevents the steel thumbscrews from directly touching and marring the surface of your eyepieces or camera nosepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this the right adapter for imaging with my NP101is?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is for connecting accessories that have a 2-inch barrel. For connecting Tele Vue's dedicated imaging system accessories like reducers or camera adapters, you will need the specific threaded components for that system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much back focus does this adapter use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe A2A-1107 takes up 1.2 inches (30.5mm) of path length. It is a critical component for enabling the use of 2-inch accessories on the \"is\" series 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\u003eProduct Code\u003c\/td\u003e\n\u003ctd\u003eA2A-1107\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003e2.4\" Female Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Side Connection\u003c\/td\u003e\n\u003ctd\u003e2\" Barrel Receptacle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocking Mechanism\u003c\/td\u003e\n\u003ctd\u003eDual Thumbscrews with Brass Clamp Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eTele Vue NP101is, NP127is, and other focusers with a 2.4\" male thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized Aluminum, Brass\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\"\u003e2.4\" Adapter for 2\" Accessories\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\/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":51223884202269,"sku":"TV-A2A-1107","price":111.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_2.4in_Adapter_for_2in_Accessories_1.jpg?v=1777515017"},{"product_id":"tele-vue-focusmate-driver","title":"Tele Vue Focusmate Driver 10:1","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eMechanism: 10:1 Planetary Ball Reduction\u003c\/li\u003e\n\u003cli\u003eControl: Dual-Speed Coarse and Fine Knobs\u003c\/li\u003e\n\u003cli\u003eCompatibility: Tele Vue Refractors with 2-inch Rack-and-Pinion Focusers\u003c\/li\u003e\n\u003cli\u003eInstallation: Direct Bolt-On Replacement\u003c\/li\u003e\n\u003cli\u003eConstruction: Machined Aluminum and Stainless Steel\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\u003eFind Critical Focus at Any Power with the Tele Vue Focusmate Driver\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Focusmate Driver 10:1 is a dual-speed focuser upgrade that replaces the standard pinion block on Tele Vue refractors, delivering the mechanical precision required for high-magnification planetary viewing and critical astrophotography. It translates every turn of the fine-focus knob into a minuscule, repeatable movement of the drawtube, allowing you to snap the image into perfect focus without overshoot or backlash. This isn't a luxury, it's a fundamental tool for accessing the full resolution of your 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 10:1 Planetary Ball Reduction System\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Focusmate is a planetary ball reduction gear. Turning the fine focus knob engages this system, reducing the movement by a factor of ten compared to the coarse knob. This mechanism is essential for high-power observing where the critical focus zone, the tiny range where an image is perfectly sharp, can be just a few microns deep.\u003c\/p\u003e\n\u003cp\u003eThe practical result is the elimination of focusing frustration. When observing Jupiter at 250x, you can move from a soft edge to a perfectly defined limb with a slow, deliberate touch. For imagers, this allows for precise V-curve analysis in focusing software, ensuring you nail the point of sharpest stars across the entire frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Complete Dual-Speed Pinion Block Assembly\u003c\/h3\u003e\n\u003cp\u003eUnlike simple add-on knobs, the Focusmate Driver is a complete replacement for your telescope's stock pinion assembly. This integrated design ensures perfect alignment and zero-slop engagement with the focuser rack from the start. The entire block is machined for a direct fit, maintaining the robust, stable feel Tele Vue focusers are known for.\u003c\/p\u003e\n\u003cp\u003eBy replacing the entire unit, you gain a system that was designed from the ground up for dual-speed operation. This prevents the flexure and play that can be introduced by less integrated solutions, a critical factor when supporting the weight of a heavy eyepiece or a full 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\u003eIntuitive Coarse and Fine Control Knobs\u003c\/h3\u003e\n\u003cp\u003eThe Focusmate retains the familiar large, rubber-gripped knobs for coarse focusing, allowing you to find initial focus quickly. Concentric to the right-side knob is the smaller, finely knurled fine-focus knob. This ergonomic arrangement allows you to make large and small adjustments without ever moving your hand from the focuser.\u003c\/p\u003e\n\u003cp\u003eThis workflow becomes second nature in the dark. You can rack the focuser out to switch eyepieces with the coarse knob, then place your fingers on the fine knob to dial in the focus as your eye adapts to the new magnification. There is no fumbling, just a seamless transition from rough to critical 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\u003eAdjustable Tension for Heavy Loads\u003c\/h3\u003e\n\u003cp\u003eA key feature of the pinion block is an adjustable tension screw. This allows you to set the amount of drag on the drawtube, tailoring the focuser's feel to your preference and equipment load. You can add just enough tension to prevent a heavy eyepiece or camera from causing the focuser to drift, without making adjustments feel stiff.\u003c\/p\u003e\n\u003cp\u003eThis is the system's primary limitation and a point of deliberate design. The tensioner provides friction to hold a position, but for very heavy, long-exposure imaging setups, it may not provide an absolute lock against minute creep. It is designed for the loads of typical visual accessories and light-to-medium weight imaging cameras used with Tele Vue's smaller 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\u003eEngineered for a Seamless Retrofit on Your Tele Vue Telescope\u003c\/h3\u003e\n\u003cp\u003eThe Focusmate Driver is not a universal-fit accessory. It is specifically engineered as a drop-in upgrade for Tele Vue refractors that use their 2-inch rack-and-pinion focuser, including the TV-76, TV-85, and NP101is models. The installation is straightforward, requiring only a few minutes and the included hex wrench.\u003c\/p\u003e\n\u003cp\u003eThis model-specific design ensures that the gear pitch, screw-hole pattern, and block dimensions are a perfect match for your optical tube. It preserves the original mechanics and feel of the telescope while adding a layer of precision that transforms its high-power performance, making it feel like a completely new instrument.\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\"\u003eWill the Focusmate Driver fit my non-Tele Vue telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the Focusmate Driver is designed specifically as a direct replacement for the pinion assembly on certain Tele Vue refractors with 2-inch rack-and-pinion focusers. It is not a universal fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Focusmate Driver difficult to install?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation is straightforward for most users. It involves removing the original focuser block with a hex wrench and bolting the new Focusmate assembly in its place. Instructions are included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I switch the fine-focus knob to the left side?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe standard configuration places the fine-focus knob on the right side of the focuser. While it can be switched to the left, this is a more involved process that requires disassembling the unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of a 10:1 focuser for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt high magnifications (150x and above), the depth of field becomes extremely shallow. A 10:1 fine focuser allows you to make tiny, controlled adjustments to hit that critical point of focus without overshooting it, which is common with single-speed focusers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this necessary for wide-field, low-power viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is less critical for low-power observing where the focus zone is more generous. The primary benefit is seen during high-magnification planetary, lunar, and double-star observation, and for critical focusing in astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this compare to a Crayford-style focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Focusmate upgrades a rack-and-pinion focuser, which uses a gear to move the drawtube. Rack-and-pinions have high load capacities. Crayford focusers use friction and can feel smoother, but may slip under very heavy loads if not properly adjusted.\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 Type\u003c\/td\u003e\n\u003ctd\u003eDual-Speed Focuser Pinion Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Ratio\u003c\/td\u003e\n\u003ctd\u003e10:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMechanism\u003c\/td\u003e\n\u003ctd\u003ePlanetary Ball Reduction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eTele Vue 2-inch Rack-and-Pinion Focusers (TV-76, TV-85, NP101, etc.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControls\u003c\/td\u003e\n\u003ctd\u003eRight-side concentric fine-focus knob, dual coarse-focus knobs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized Aluminum, Stainless Steel hardware\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation Tools\u003c\/td\u003e\n\u003ctd\u003eHex Wrench (included)\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\"\u003eFocusmate 10:1 Pinion Assembly\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\"\u003eHex Wrench for Installation\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_FocusMate_Driver_10-to-1_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":51223885054237,"sku":"TV-FDF-2004","price":347.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Focusmate_Driver_10to1_1.jpg?v=1777515023"}],"url":"https:\/\/davidastro.com\/fr\/collections\/televue-focuser-accessories.oembed","provider":"David Astro","version":"1.0","type":"link"}