{"product_id":"svbony-sv158-2-extension-tube","title":"SVBONY SV158 2″ Extension Tube","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371470418533931716575265.jpg?v=1791670354\" alt=\"SVBONY SV158 2″ 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 SV158 is a 2″ extension tube that adds 75 mm of length between your focuser and a 2″ eyepiece, diagonal, camera or accessory. It is CNC-machined aluminium alloy, ø59 x 75 mm, in black. This listing is the 75 mm length (item W9119A).\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9119a_20250807154220_0665_20260820165505_5836.webp?v=1791670354\" alt=\"SVBONY SV158 2″ 75mm 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 your telescope has a 2″ focuser and an eyepiece, camera or accessory cannot reach focus without more outward travel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e75 mm of extension:\u003c\/strong\u003e extends the focusing range for 2″ accessories.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2″ barrel and holder.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC-machined aluminium alloy:\u003c\/strong\u003e durable, secure connection, black finish.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight and compact:\u003c\/strong\u003e easy to keep in an eyepiece case.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371470418533903883950782.jpg?v=1791670354\" alt=\"SVBONY SV158 extension tube feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eMechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eSVBONY's structure drawing below shows how the tube is built: a 2″ barrel at one end and a 2″ holder at the other, with the body between providing the 75 mm of extension.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373448948196714881336435.png?v=1791670354\" alt=\"SVBONY SV158 extension tube structure diagram\" 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 2″ eyepieces or cameras on telescopes with limited outward travel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging trains\u003c\/strong\u003e where extra length is needed in front of a camera or accessory.\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 2″ focusers; accepts 2″ eyepieces, diagonals and nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther length:\u003c\/strong\u003e SVBONY also makes the SV158 in 90 mm (W9119B); 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\/6371470428461615553914546.jpg?v=1791670354\" alt=\"SVBONY SV158 2″ extension tube detail\" 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 it helps when you run out of outward travel, not when a camera needs to come inward.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ only:\u003c\/strong\u003e a 1.25″ focuser needs the SV157 instead.\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 2″ focuser and lock it, then fit your eyepiece or camera into it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich length should I choose?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThat depends on how far short of focus you are. Send us your telescope and accessory and we will work out the length with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 75 mm aluminium 2″ extension tube that gives 2″ eyepieces and cameras the extra outward travel they need to reach focus.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"75mm","offer_id":67722277322863,"sku":"W9119A","price":19.37,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9119a_20250807154220_0665_20260820165505_5836.webp?v=1791670354","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv158-2-extension-tube","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}