{"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","url":"https:\/\/davidastro.com\/products\/tele-vue-eyepiece-barrel-extension-2-inch","provider":"David Astro","version":"1.0","type":"link"}