{"product_id":"svbony-sv181-1-25-newtonian-rack-pinion-focuser","title":"SVBONY SV181 1.25″ Rack and Pinion Newtonian Reflector Focuser","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385787024238121473859676.jpg?v=1791670533\" alt=\"SVBONY SV181 Newtonian focuser 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 SV181 is a 1.25″ rack and pinion focuser for Newtonian reflector telescopes from 114 mm to 150 mm aperture. It has a 105 mm focuser tube with 65 mm of travel, geared focusing for fine adjustment, and a 1.25″ eyepiece adapter with an internal brass ring so the set screw does not mark eyepiece barrels. The interior is fully threaded to minimise reflections, and the body is metal.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9140a-1_20250807102008_2400_20260820163527_2093.webp?v=1791670532\" alt=\"SVBONY SV181 1.25″ rack and pinion Newtonian focuser\" 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 you have a 114 mm to 150 mm Newtonian with a worn, damaged or rough 1.25″ focuser and want a metal rack and pinion replacement.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack and pinion:\u003c\/strong\u003e geared focusing with fine adjustment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e65 mm travel\u003c\/strong\u003e on a 105 mm focuser tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ eyepiece adapter with brass ring:\u003c\/strong\u003e the set screw presses on the ring, not the eyepiece barrel.\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\u003eMetal construction:\u003c\/strong\u003e CNC-machined aluminium for a secure fit.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385787024272453855953953.jpg?v=1791670533\" alt=\"SVBONY SV181 Newtonian focuser specifications panel\" 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\u003eReplacement focuser\u003c\/strong\u003e for 114–150 mm Newtonian reflectors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing\u003c\/strong\u003e with 1.25″ eyepieces.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9140a-2_20250807102008_6699.jpg?v=1791670532\" alt=\"SVBONY SV181 focuser side view\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for:\u003c\/strong\u003e 114 mm to 150 mm Newtonian reflectors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepieces:\u003c\/strong\u003e 1.25″.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting:\u003c\/strong\u003e mounting-hole pattern and tube curvature vary between telescope makers, so it is worth confirming the fit. Send us your telescope model and we will check it with you.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385787024302862616004879.jpg?v=1791670533\" alt=\"SVBONY SV181 Newtonian focuser detail panel\" 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\u003e1.25″ only:\u003c\/strong\u003e it does not take 2″ eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement part:\u003c\/strong\u003e fitting it means removing the existing focuser from the tube.\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\u003eIt is a straightforward swap: remove the old focuser's screws, fit the SV181 in its place, and re-collimate if the secondary mirror needs it afterwards. We are happy to talk you through it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit my reflector?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY designs it for 114 mm to 150 mm Newtonians. Send us your telescope model and we will confirm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for imaging?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is a 1.25″ visual focuser; with 65 mm of travel it suits eyepieces and light 1.25″ cameras.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a metal 1.25″ rack and pinion focuser with 65 mm of travel and a brass-ring eyepiece holder, built as a replacement for 114–150 mm Newtonian reflectors.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722319757423,"sku":"W9140A","price":44.16,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9140a-1_20250807102008_2400_20260820163527_2093.webp?v=1791670532","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv181-1-25-newtonian-rack-pinion-focuser","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}