{"product_id":"astronomy-plus-sct-2-dual-speed-rack-bearing-focuser","title":"Astronomy Plus 2\" Precision  Dual-Speed Rack \u0026 Bearing Focuser for SCT","description":"\u003ch1 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAstronomy Plus 2\" SCT Dual-Speed Rack \u0026amp; Bearing Focuser\u003c\/h1\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003ePrecision focusing is the foundation of a great observing experience, and this 2-inch dual-speed focuser was engineered from the ground up to deliver exactly that. Developed after years of dedicated research, it combines a patented bearing-and-rack system that sets it apart from conventional focusers.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eA unique approach to stability\u003c\/strong\u003e Eight evenly distributed bearings share the load in every direction, eliminating play and flex while supporting heavy eyepieces and camera setups with ease. Unlike traditional designs where the focuser tube bears the mechanical load, the rack here handles transmission only — meaning force applied during focusing never introduces drift or shifts your optical axis. The result is exceptional light-path stability, surpassing that of premium focusers in its class.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eSmooth, confident control\u003c\/strong\u003e The dual-speed fine adjustment mechanism delivers a silky, feather-light feel at the fingertips. Whether you're doing a rough focus pass or dialing in critical sharpness for high-magnification planetary work or astrophotography, each movement is precise and predictable. The fine-adjustment gear is also compatible with synchronous belt drives for motorized setups.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong data-start=\"833\" data-end=\"854\"\u003ePayload Capacity:\u003c\/strong\u003e Supports heavy accessories such as cameras, filter wheels, coma correctors, and imaging trains up to approximately \u003cstrong data-start=\"970\" data-end=\"980\"\u003e5.2 kg\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch4 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSpecifications at a glance\u003c\/h4\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBarrel size: 2 inches\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eClear height: 40 mm\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eAvailable focusing stroke: 35 mm or 60 mm\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBody weight: approx. 600 g\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBearing preload: fully adjustable for zero-clearance fit\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDual-speed fine adjustment \u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003ePayload: 5.2 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWhether you're a visual observer demanding a rock-solid platform or an imager chasing razor-sharp stars, this focuser offers the build quality and tactile refinement to match your ambitions.\u003c\/p\u003e\n\u003ch2 data-end=\"53\" data-start=\"0\" data-section-id=\"18jmm50\"\u003eChoosing Between the 35mm and 60mm Travel Versions\u003c\/h2\u003e\n\u003cp data-end=\"206\" data-start=\"55\"\u003eThis focuser is available in both a compact 35mm travel version and a longer 60mm travel version to better match different observing and imaging needs.\u003c\/p\u003e\n\u003ch4 data-end=\"231\" data-start=\"208\" data-section-id=\"1u2ocsi\"\u003e35mm Travel Version\u003c\/h4\u003e\n\u003cp data-end=\"572\" data-start=\"232\"\u003eThe 35mm version is ideal for astrophotography setups where rigidity, compactness, and reduced flexure are important.\u003cbr data-end=\"352\" data-start=\"349\"\u003eIts shorter travel helps keep the imaging train more stable while reducing overall weight and profile. This version is generally recommended for users with a well-optimized imaging setup and known backfocus requirements.\u003c\/p\u003e\n\u003cp data-end=\"590\" data-start=\"574\"\u003eRecommended for:\u003c\/p\u003e\n\u003cul data-end=\"699\" data-start=\"591\"\u003e\n\u003cli data-end=\"609\" data-start=\"591\" data-section-id=\"r0qu6i\"\u003eAstrophotography\u003c\/li\u003e\n\u003cli data-end=\"634\" data-start=\"610\" data-section-id=\"147sgih\"\u003eCompact imaging setups\u003c\/li\u003e\n\u003cli data-end=\"667\" data-start=\"635\" data-section-id=\"xbc8nv\"\u003eUsers wanting maximum rigidity\u003c\/li\u003e\n\u003cli data-end=\"699\" data-start=\"668\" data-section-id=\"1qavo06\"\u003ePermanent or optimized setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 data-end=\"724\" data-start=\"701\" data-section-id=\"16xdggy\"\u003e60mm Travel Version\u003c\/h4\u003e\n\u003cp data-end=\"970\" data-start=\"725\"\u003eThe 60mm version offers additional focus travel, making it more versatile for visual observing and mixed-use setups.\u003cbr data-end=\"844\" data-start=\"841\"\u003eIt is especially useful when using multiple accessories, diagonals, reducers, or eyepieces requiring larger focus adjustments.\u003c\/p\u003e\n\u003cp data-end=\"988\" data-start=\"972\"\u003eRecommended for:\u003c\/p\u003e\n\u003cul data-end=\"1121\" data-start=\"989\"\u003e\n\u003cli data-end=\"1007\" data-start=\"989\" data-section-id=\"1nwlspv\"\u003eVisual observing\u003c\/li\u003e\n\u003cli data-end=\"1038\" data-start=\"1008\" data-section-id=\"12tu4qz\"\u003eMixed visual and imaging use\u003c\/li\u003e\n\u003cli data-end=\"1072\" data-start=\"1039\" data-section-id=\"9zwvni\"\u003eUsers with multiple accessories\u003c\/li\u003e\n\u003cli data-end=\"1121\" data-start=\"1073\" data-section-id=\"1p9a2wm\"\u003eSituations requiring greater focus flexibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"1314\" data-start=\"1123\"\u003eIf you are unsure which version to choose, the 60mm version is typically the safest and most versatile option, while experienced astrophotographers often prefer the more compact 35mm version.\u003c\/p\u003e\n\u003ch3 data-section-id=\"n92gac\" data-start=\"0\" data-end=\"21\"\u003eWide Compatibility\u003c\/h3\u003e\n\u003cp data-start=\"23\" data-end=\"147\"\u003eFeatures a standard 2\" SCT thread (2\"-24) and is compatible with many Schmidt-Cassegrain and Maksutov telescopes, including:\u003c\/p\u003e\n\u003cul data-start=\"149\" data-end=\"373\"\u003e\n\u003cli data-section-id=\"14vgzc0\" data-start=\"149\" data-end=\"168\"\u003eSCT 5\" and SCT 6\"\u003c\/li\u003e\n\u003cli data-section-id=\"cfj5ch\" data-start=\"169\" data-end=\"200\"\u003eSCT 8\" and Celestron EdgeHD  8\"\u003c\/li\u003e\n\u003cli data-section-id=\"xdz184\" data-start=\"201\" data-end=\"320\"\u003eSCT and Celestron EdgeHD 9.25 \/ 11\" \/ 14\"\u003cbr data-start=\"244\" data-end=\"247\"\u003e(using the Large SCT to 2\" reducer adapter included with the telescope)\u003c\/li\u003e\n\u003cli data-section-id=\"1bcfmpi\" data-start=\"321\" data-end=\"373\"\u003eMaksutov telescopes featuring standard SCT threads\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"375\" data-end=\"492\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong\u003eConfirmed compatible with models:\u003c\/strong\u003e\u003cbr\u003e11069 \/ 12091 \/ 12096 \/ 12092 \/ 91024 \/ 91027 \/ 91036 \/ 91038 \/ 91030 \/ 91040 \/ 91050 \/ 91060\u003c\/p\u003e\n\u003cp data-start=\"375\" data-end=\"492\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong\u003eFocuser is equipped with a micrometric reduction of 1:10 and can be motorised with one of the many systems available on the market (e.g. EAF ZWO).\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"375\" data-end=\"492\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong\u003ePlease note\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"375\" data-end=\"492\"\u003eThe \u003cstrong\u003eCelestron SCT\u003c\/strong\u003e only works with a \u003cstrong\u003e35mm focus stroke.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"375\" data-end=\"492\"\u003eThe \u003cstrong\u003eGSO RC \u003c\/strong\u003etelescope \u003cstrong\u003erequires a 60mm\u003c\/strong\u003e focus stroke.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel diameter\u003c\/td\u003e\n\u003ctd\u003e2 inches (50.8 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear height\u003c\/td\u003e\n\u003ctd\u003e40 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocusing stroke\u003c\/td\u003e\n\u003ctd\u003e35 mm or 60 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePayload capacity\u003c\/td\u003e\n\u003ctd\u003eUp to approximately 5.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody weight\u003c\/td\u003e\n\u003ctd\u003e≈ 600 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive system\u003c\/td\u003e\n\u003ctd\u003eRack \u0026amp; Pinion \/ Bearing (patented)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of bearings\u003c\/td\u003e\n\u003ctd\u003e8 (evenly distributed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBearing preload\u003c\/td\u003e\n\u003ctd\u003eFully adjustable \/ zero clearance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeed adjustment\u003c\/td\u003e\n\u003ctd\u003eDual-speed (coarse + fine)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotorisation compatibility\u003c\/td\u003e\n\u003ctd\u003eYes, ZWO EAF and synchronous belt drive ready\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRack type\u003c\/td\u003e\n\u003ctd\u003eToothed \/ transmission only (load-independent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended use\u003c\/td\u003e\n\u003ctd\u003eVisual observation \u0026amp; astrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility (with adapter)\u003c\/td\u003e\n\u003ctd\u003eStandard telescope adapter systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eDiagram\u003c\/h4\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/O1CN01Q1GtvX1M2huhPGNVc__49501377_cfd95847-3fe4-4f93-9bb6-bac3f2da7ae9_1024x1024.webp?v=1778703229\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e \u003c\/p\u003e\n\u003ch3 class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e2\" Dual-Speed Rack \u0026amp; Bearing Focuser, selected travel length : 35mm or 60 mm\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eSCT Adapter \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astronomyplus.com\/pages\/astronomy-plus-products-warranty\" rel=\"noopener\" target=\"_blank\"\u003eAstronomy Plus limited Warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"Astronomy Plus","offers":[{"title":"35mm \/ Image circle adapted for M42 imaging train","offer_id":49020885565669,"sku":"AP-F2-35T-RD+F2-SCT-42","price":431.0,"currency_code":"CAD","in_stock":true},{"title":"35mm \/ Image circle adapted for M54 imaging train","offer_id":49039025537253,"sku":null,"price":431.0,"currency_code":"CAD","in_stock":true},{"title":"60mm \/ Image circle adapted for M42 imaging train","offer_id":49021993418981,"sku":"AP-F2-60T-RD+F2-SCT-42","price":431.0,"currency_code":"CAD","in_stock":true},{"title":"60mm \/ Image circle adapted for M54 imaging train","offer_id":49039025570021,"sku":null,"price":431.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/20260513_154528.jpg?v=1778701943","url":"https:\/\/astronomyplus.com\/products\/astronomy-plus-sct-2-dual-speed-rack-bearing-focuser","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}