{"product_id":"svbony-sv157-1-25-extension-tube","title":"SVBONY SV157 1.25″ Extension Tube","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371470145729105069146136.jpg?v=1791670353\" alt=\"SVBONY SV157 1.25″ extension tube key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV157 is a 1.25″ extension tube that adds 56 mm of length between your focuser or diagonal and an eyepiece or 1.25″ camera. It is all-metal aluminium alloy, ø39 x 56 mm, with a fully threaded interior to reduce reflected light, and its end is threaded to take a standard 1.25″ filter. This listing is the 56 mm length (item W9118A).\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9118a-1_20250807154413_8456_20260820160531_0272.webp?v=1791670353\" alt=\"SVBONY SV157 1.25″ 56mm extension tube\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if an eyepiece, camera or accessory on your telescope cannot travel far enough outward to reach focus and needs extra length in the 1.25″ train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e56 mm of extension:\u003c\/strong\u003e moves the focal plane position outward to bring an eyepiece or camera to focus.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1.25″ barrel and holder.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter thread at the end:\u003c\/strong\u003e takes standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully threaded interior:\u003c\/strong\u003e reduces internal reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC-machined aluminium alloy:\u003c\/strong\u003e all-metal, black.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371470145729958486207623.jpg?v=1791670353\" alt=\"SVBONY SV157 extension tube feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371470145729077709957342.jpg?v=1791670353\" alt=\"SVBONY SV157 extension tube detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReaching focus\u003c\/strong\u003e with eyepieces or 1.25″ cameras on telescopes with limited outward travel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpacing\u003c\/strong\u003e in a 1.25″ imaging or visual train.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 1.25″ focusers and diagonals; accepts 1.25″ eyepieces and nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther length:\u003c\/strong\u003e SVBONY also makes the SV157 in 70 mm (W9118B); ask us if you need that length.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371470145741775165860520.jpg?v=1791670353\" alt=\"SVBONY SV157 extension tube dimensions\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoves focus outward only:\u003c\/strong\u003e an extension tube helps when you run out of outward travel; if your eyepiece needs to come inward, it adds to the problem rather than fixing it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e this listing is 56 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Insert it into the focuser like an eyepiece, then put the eyepiece or camera into the tube.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need one?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIf you rack the focuser all the way out and the image still is not sharp, extra length is what you need. Send us your telescope and eyepiece and we will check the length for you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I add a filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The end is threaded for standard 1.25″ filters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 56 mm all-metal 1.25″ extension tube with a threaded, reflection-reducing interior for bringing eyepieces and cameras to focus.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"56mm","offer_id":67722276864111,"sku":"W9118A","price":15.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9118a-1_20250807154413_8456_20260820160531_0272.webp?v=1791670353","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv157-1-25-extension-tube","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}