{"product_id":"starfield-optics-2-richey-chretien-r-p-focuser-eaf-compatable","title":"Starfield Optics 2\" Richey-Chretien R\u0026P focuser .  EAF Compatable","description":"\u003ch2 data-end=\"85\" data-start=\"0\" data-section-id=\"1enlynv\"\u003e2\" Linear-Bearing Crayford Focuser (ZWO EAF Mount-Ready) for 6\" \u0026amp; 8\" GSO RC\/CC\u003c\/h2\u003e\n\u003cp data-end=\"526\" data-start=\"87\"\u003eIf you’re upgrading the stock focuser on a GSO 6\" or 8\" Ritchey-Chrétien (or Classical Cassegrain) and you want smoother motion, better load handling, and straightforward motor-focuser mounting, this dual-speed linear-bearing Crayford is built for exactly that. It combines a rigid rail-guided drawtube with fine 10:1 control—great for heavy eyepieces or imaging trains where repeatable focus matters.\u003c\/p\u003e\n\u003ch3 data-end=\"560\" data-start=\"533\" data-section-id=\"16fwv6t\"\u003eWhat makes it different\u003c\/h3\u003e\n\u003cp data-end=\"971\" data-start=\"562\"\u003e\u003cstrong data-end=\"614\" data-start=\"562\"\u003eRail-guided stability (less tilt, less “wiggle”)\u003c\/strong\u003e\u003cbr data-end=\"617\" data-start=\"614\"\u003eInstead of relying only on the typical small roller contact points found in many Crayfords, this design uses a stainless linear-rail system that keeps the drawtube supported across its travel for improved rigidity—especially helpful when the scope is aimed low and the imaging payload is working the focuser hardest. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"1316\" data-start=\"973\"\u003e\u003cstrong data-end=\"1014\" data-start=\"973\"\u003eDual-speed control for critical focus\u003c\/strong\u003e\u003cbr data-end=\"1017\" data-start=\"1014\"\u003eYou get a standard coarse knob plus a \u003cstrong data-end=\"1074\" data-start=\"1055\"\u003e10:1 microfocus\u003c\/strong\u003e for tiny adjustments when stars are almost “there” but not quite. There’s also a \u003cstrong data-end=\"1173\" data-start=\"1156\"\u003edrawtube lock\u003c\/strong\u003e for holding focus once you’ve nailed it, and \u003cstrong data-end=\"1241\" data-start=\"1219\"\u003etension adjustment\u003c\/strong\u003e to match the weight you’re carrying. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"1645\" data-start=\"1318\"\u003e\u003cstrong data-end=\"1375\" data-start=\"1318\"\u003eZWO EAF-friendly housing (no custom bracket required)\u003c\/strong\u003e\u003cbr data-end=\"1378\" data-start=\"1375\"\u003eThis version is designed with a flat mounting surface and extra mounting points so a \u003cstrong data-end=\"1474\" data-start=\"1463\"\u003eZWO EAF\u003c\/strong\u003e can be attached using the \u003cstrong data-end=\"1545\" data-start=\"1501\"\u003estandard bracket that comes with the EAF\u003c\/strong\u003e—no third-party printed adapters needed. \u003cem data-end=\"1607\" data-start=\"1586\"\u003e(EAF not included.)\u003c\/em\u003e \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"1851\" data-start=\"1647\"\u003e\u003cstrong data-end=\"1693\" data-start=\"1647\"\u003eRotation for comfortable framing\/observing\u003c\/strong\u003e\u003cbr data-end=\"1696\" data-start=\"1693\"\u003eLoosen the rotation collar, turn the focuser to a better angle for viewing or camera framing, then lock it back down. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-end=\"1856\" data-start=\"1853\"\u003e\n\u003ch3 data-end=\"1879\" data-start=\"1858\" data-section-id=\"yvefr1\"\u003eTelescope fitment\u003c\/h3\u003e\n\u003cul data-end=\"2191\" data-start=\"1881\"\u003e\n\u003cli data-end=\"2057\" data-start=\"1881\" data-section-id=\"1cuoz63\"\u003e\n\u003cp data-end=\"2057\" data-start=\"1883\"\u003eThreads directly onto compatible \u003cstrong data-end=\"1960\" data-start=\"1916\"\u003eGSO-manufactured (Astro-tech, iOptron, Orion, etc...) 6\" and 8\" RC telescopes\u003c\/strong\u003e using the \u003cstrong data-end=\"1987\" data-start=\"1971\"\u003eM90x1 female\u003c\/strong\u003e thread on the telescope side.  \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2191\" data-start=\"2058\" data-section-id=\"j5zqe3\"\u003e\n\u003cp data-end=\"2191\" data-start=\"2060\"\u003eOften found under multiple brand labels (the underlying GSO rear-thread standard is the key). \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"2196\" data-start=\"2193\"\u003e\n\u003ch3 data-end=\"2223\" data-start=\"2198\" data-section-id=\"enxvqd\"\u003eIn the box \/ features\u003c\/h3\u003e\n\u003cul data-end=\"2645\" data-start=\"2225\"\u003e\n\u003cli data-end=\"2317\" data-start=\"2225\" data-section-id=\"17tci3n\"\u003e\n\u003cp data-end=\"2317\" data-start=\"2227\"\u003e2\" eyepiece barrel with \u003cstrong data-end=\"2277\" data-start=\"2251\"\u003ebrass compression ring\u003c\/strong\u003e \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2442\" data-start=\"2318\" data-section-id=\"13alxru\"\u003e\n\u003cp data-end=\"2442\" data-start=\"2320\"\u003e\u003cstrong data-end=\"2343\" data-start=\"2320\"\u003e2\" to 1.25\" adapter\u003c\/strong\u003e (with brass ring) and \u003cstrong data-end=\"2387\" data-start=\"2366\"\u003e2\" filter threads\u003c\/strong\u003e on the adapter \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2543\" data-start=\"2443\" data-section-id=\"puch0k\"\u003e\n\u003cp data-end=\"2543\" data-start=\"2445\"\u003e\u003cstrong data-end=\"2476\" data-start=\"2445\"\u003eLaser-marked drawtube scale\u003c\/strong\u003e for repeatable positioning \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2645\" data-start=\"2544\" data-section-id=\"1iifhsu\"\u003e\n\u003cp data-end=\"2645\" data-start=\"2546\"\u003ePackaged in a foam-fitted padded box; \u003cstrong data-end=\"2605\" data-start=\"2584\"\u003eno printed manual\u003c\/strong\u003e \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"2650\" data-start=\"2647\"\u003e\n\u003ch3 data-end=\"2711\" data-start=\"2652\" data-section-id=\"1gxe09z\"\u003eFocus travel note (important for eyepieces\/accessories)\u003c\/h3\u003e\n\u003cp data-end=\"3022\" data-start=\"2713\"\u003eCrayford units are often \u003cstrong data-end=\"2749\" data-start=\"2738\"\u003eshorter\u003c\/strong\u003e than some rack-and-pinion focusers. That usually \u003cem data-end=\"2806\" data-start=\"2799\"\u003ehelps\u003c\/em\u003e with gaining in-focus (nice for imaging\/binoviewers), but if you run out of \u003cstrong data-end=\"2896\" data-start=\"2883\"\u003eout-focus\u003c\/strong\u003e with certain eyepieces\/accessories, the common fix is adding a \u003cstrong data-end=\"2981\" data-start=\"2960\"\u003e2\" extension tube\u003c\/strong\u003e. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"526\" data-start=\"87\"\u003e \u003c\/p\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":44554055385199,"sku":"SF-RCFOC2","price":394.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/IMG_4022.jpg?v=1771711962","url":"https:\/\/ontariotelescope.com\/products\/starfield-optics-2-richey-chretien-r-p-focuser-eaf-compatable","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}