{"product_id":"svbony-sv158-90mm-extension-tube-2in","title":"SVBONY SV158 90mm Extension Tube - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds Critical Spacing to 2-inch Focusers\u003c\/li\u003e\n\u003cli\u003eSolves Focuser Travel Limitations\u003c\/li\u003e\n\u003cli\u003eCNC-Machined Aluminum Alloy Construction\u003c\/li\u003e\n\u003cli\u003eStandard 2-inch Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eBlack Anodized to Reduce Reflections\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\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 SV158 75mm Extension Tube 2 inch\u003c\/h2\u003e\n      \u003cp\u003eThe SVBONY SV158 Extension Tube adds critical spacing to any 2-inch focuser or visual back, solving common focus travel issues. This all-metal, black anodized tube is machined from a solid block of aluminum alloy to securely fit standard 2-inch accessories without introducing flexure.\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\u003eAdd Critical Spacing to Your 2-inch Focuser\u003c\/h3\u003e\n      \u003cp\u003eThis extension tube is essential when your focuser runs out of outward travel before achieving a sharp image. This often occurs when using imaging cameras, off-axis guiders, or certain eyepieces that require more back-focus. By inserting the SV158 into your 2-inch focuser, you physically extend the light path, pushing the focal plane outward to where your accessories can reach it.\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\u003eRigid, CNC-Machined 2-inch Aluminum Construction\u003c\/h3\u003e\n      \u003cp\u003eConstructed from black anodized aluminum alloy, the SV158 maintains a rigid and secure connection in your optical train. The robust build prevents flexure and tilt that can ruin an astrophoto, ensuring your camera or eyepiece remains perfectly aligned with the telescope's optical axis. The blackened interior surfaces also help to minimize stray light and improve image contrast.\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\"\u003eWhen would I need the SVBONY SV158 2-inch Extension Tube?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou need the \u003cstrong\u003eSVBONY SV158 Extension Tube\u003c\/strong\u003e when you cannot achieve focus because your focuser does not have enough \"out-travel.\" This is a common issue with astrophotography cameras, which often have a focal point further back than typical eyepieces, or with certain telescope and eyepiece combinations.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV158 Extension Tube work with my 2-inch diagonal and eyepieces?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The SVBONY SV158 is designed with a standard \u003cstrong\u003e2-inch barrel\u003c\/strong\u003e and receiver, making it compatible with all standard 2-inch diagonals, eyepieces, Barlow lenses, and other accessories.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV158 Extension Tube suitable for astrophotography?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. The SVBONY SV158 is ideal for astrophotography. Its rigid \u003cstrong\u003ealuminum alloy\u003c\/strong\u003e construction prevents flexure in the imaging train, and it provides the necessary spacing to bring cameras, filter wheels, and off-axis guiders into focus.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the SVBONY SV158 Extension Tube made of?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe tube is precision CNC-machined from a single piece of high-grade \u003cstrong\u003eAluminum Alloy\u003c\/strong\u003e and finished with a black anodization to increase durability and reduce internal reflections.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI can't reach focus with my DSLR on my 8\" SCT. Will the SVBONY SV158 Extension Tube help?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is a perfect use case. SCTs often require additional back-focus to reach focus with DSLR or dedicated astronomy cameras. The \u003cstrong\u003eSVBONY SV158 2-inch Extension Tube\u003c\/strong\u003e will add the necessary length to your optical path, allowing you to easily achieve sharp focus.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eMy new wide-field 2-inch eyepiece requires a lot of 'out-travel' on my Dobsonian. Is the SVBONY SV158 a good solution?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. If your Dobsonian's focuser is racked all the way out and you still can't focus your 2-inch eyepiece, the \u003cstrong\u003eSVBONY SV158 Extension Tube\u003c\/strong\u003e is the correct solution. It will provide the extra focuser travel you need to get a sharp, wide-field view.\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\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAluminum Alloy\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      \u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2''\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n  \u003c\/ul\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 Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861243588893,"sku":"SV-W9119B","price":21.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV158-75mm-Extension-Tube-2-inch-1-W9119B_23fcaed0-aa17-4db6-b849-3e6eb5553e61.jpg?v=1788660537","url":"https:\/\/davidastro.com\/fr\/products\/svbony-sv158-90mm-extension-tube-2in","provider":"David Astro","version":"1.0","type":"link"}