{"product_id":"svbony-sv181-rack-and-pinion-newtonian-reflector-focuser-125in","title":"SVBONY SV181 Rack and Pinion Newtonian Reflector Focuser - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e65mm Focuser Travel\u003c\/li\u003e\n\u003cli\u003e105mm Focuser Tube Length\u003c\/li\u003e\n\u003cli\u003eAccepts 1.25'' Eyepieces\u003c\/li\u003e\n\u003cli\u003eFits 114mm-150mm Newtonian Reflectors\u003c\/li\u003e\n\u003cli\u003eDurable All-Metal Rack \u0026amp; Pinion Design\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\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 SV181 1.25'' Rack Pinion Newtonian Reflector Focuser\u003c\/h2\u003e\n      \u003cp\u003eThe Svbony SV181 is a 1.25'' rack and pinion focuser designed as a robust metal upgrade for 114mm to 150mm Newtonian reflectors. Its 105mm focuser tube provides a generous 65mm of travel, ensuring you can bring a wide range of eyepieces to a sharp, stable focus without the flexure common in stock plastic focusers.\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\u003eRack \u0026amp; Pinion Mechanism with 65mm of Travel\u003c\/h3\u003e\n      \u003cp\u003eThe SV181 uses a classic rack and pinion design, prized for its reliability and positive, slip-free action. With 65mm of total focus travel, you have ample range to achieve focus with standard eyepieces, Barlow lenses, and other 1.25\" accessories. The all-metal construction prevents the cracking and flexure that plagues plastic focusers included with many entry-level telescopes.\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\u003eA Drop-in Upgrade for 114mm-150mm Newtonian Reflectors\u003c\/h3\u003e\n      \u003cp\u003eThis focuser is engineered to be a direct replacement for the stock units on Newtonian telescopes with apertures from 114mm (4.5\") to 150mm (6\"). Upgrading to the SV181's metal body and precise mechanism provides a noticeable improvement in stability and focusing accuracy, making your observing sessions more productive. The standard 1.25\" eyepiece holder is compatible with the vast majority of astronomy eyepieces and accessories.\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\u003eSV181 Rack \u0026amp; Pinion vs. Crayford Focusers: A 1.25\" Workhorse\u003c\/h3\u003e\n      \u003cp\u003eWhile Crayford focusers are known for their smooth feel, the rack and pinion system of the SV181 offers a key advantage: zero slippage. The geared teeth provide a direct, mechanical engagement that won't lose its grip, even with heavier 1.25\" eyepieces. For visual observation on smaller Newtonians, this simple reliability often outweighs the finer touch of more complex designs.\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\"\u003eWill the Svbony SV181 focuser fit my telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe SV181 is designed as a drop-in replacement for many \u003cstrong\u003eNewtonian reflector telescopes\u003c\/strong\u003e with optical tube apertures between \u003cstrong\u003e114mm and 150mm\u003c\/strong\u003e. You should measure the mounting hole pattern on your telescope tube to ensure compatibility before purchasing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the SV181's rack and pinion design?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary benefit is \u003cstrong\u003ereliability and positive engagement\u003c\/strong\u003e. Unlike friction-based focusers that can slip under load, the SV181's geared rack and pinion system ensures a direct, slip-free connection. This is especially useful for maintaining focus when swapping eyepieces.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow much focus travel does the Svbony SV181 provide?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe SV181 offers a generous \u003cstrong\u003e65mm of focuser travel\u003c\/strong\u003e. This range is sufficient to bring most standard 1.25\" eyepieces, Barlows, and other visual accessories to a sharp focus.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV181 on my 130mm f\/5 Newtonian to view the Orion Nebula (M42)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, absolutely. A 130mm Newtonian is well within the 114mm-150mm compatibility range. The SV181's all-metal construction will provide a stable platform for your 1.25\" eyepieces, allowing you to make fine focus adjustments to resolve the Trapezium stars at the heart of M42.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV181 compatible with a standard set of 1.25\" Plössl eyepieces?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The Svbony SV181 features a standard \u003cstrong\u003e1.25\" eyepiece adapter\u003c\/strong\u003e, making it fully compatible with all standard 1.25\" eyepieces, including Plössls, Kellners, and wide-field designs, as well as 1.25\" Barlow lenses and filters.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan the SV181 focuser hold a heavy DSLR camera for astrophotography?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe SV181 is primarily designed for visual use with 1.25\" eyepieces. While its metal construction is robust, a single-speed rack and pinion focuser is not ideal for the weight and precision focus requirements of DSLR astrophotography. For serious imaging, a dual-speed Crayford or a more robust rack and pinion focuser is recommended.\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\u003eFocuser Type\u003c\/td\u003e\n\u003ctd\u003eRack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocuser Tube Length\u003c\/td\u003e\n\u003ctd\u003e105mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e65mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEyepiece Adapter\u003c\/td\u003e\n\u003ctd\u003e1.25''\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTelescope Compatibility\u003c\/td\u003e\n\u003ctd\u003e114mm-150mm Newtonian Reflectors\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    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eSV181 1.25'' Rack Pinion Focuser Assembly\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\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSvbony 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861263380765,"sku":"SV-W9140A","price":43.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV181-1-25-Rack-Pinion-Newtonian-Reflector-Focuser-1_e04f7315-c2a3-4c2e-a623-0415bb855cd9.jpg?v=1788883407","url":"https:\/\/davidastro.com\/fr\/products\/svbony-sv181-rack-and-pinion-newtonian-reflector-focuser-125in","provider":"David Astro","version":"1.0","type":"link"}