{"product_id":"explore-scientific-3-inch-self-centering-focuser-es-foc3","title":"3-inch Self-Centering Focuser","description":"\u003c!--start tab--\u003e\n\u003cp\u003eWith its ability to support heavy imaging trains without sacrificing stability, precision or smooth rotation, the robust Explore Scientific 3-inch Self-Centering Focuser is designed to meet the demanding requirements of astrophotography.\u003c\/p\u003e\n\u003cp\u003eThis heavy-duty focuser has a self-centering compression system that applies pressure equally to the draw tube, guaranteeing a tight, secure fit. This uniform pressure creates a stable base for an imaging setup and prevents flex, tilt and image shift. The draw tube, which is long enough to eliminate the need for extension tubes, is moved by a helical rack-and-pinion system lubricated with marine-grade PTFE silicone for an easy glide with maximum precision and minimal backlash. The interior of the draw tube has a diameter of 3 inches that is lined with multiple baffles to reduce reflection.\u003c\/p\u003e\n\u003cp\u003eThe draw tube, which has a travel of 84.5mm, is supported by a locking clutch system. The focusing system has a lifting capacity of 17 pounds. Moderate tightening offers an infinite range of tension to best suit the application.\u003c\/p\u003e\n\u003cp\u003eWeighing in at 5.7 pounds, the focuser is made of black anodized aluminum. It has a 9:1 focus system with stainless-steel ball bearings and stainless-steel focus shaft. This system works as a clutch to prevent damage to the focusing mechanism. The focusing system is compatible with popular after-market electric focuser devices.\u003c\/p\u003e\n\u003cp\u003eA back cell adapter with no-tool knobs attaches the focuser at four contact points to select Explore Scientific refractors with apertures ranging from 120mm to 140mm. The knobs on the adapter can be hand turned, eliminating the need for a hex key. This makes it easy to adjust the rotation of the focuser with minimal observing or imaging interruption. A Teflon ring on the focuser adds to the smooth rotation.\u003c\/p\u003e\n\u003cp\u003eFor versatility, the focuser can hold 2-inch or 3-inch visual or camera accessories and comes standard with twist-lock. In addition to allowing accessories to be secured with a compression fitting, this draw tube’s M82 x 1.25 pitch thread accepts adapters with a variety of uses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNOTE: Explore Scientific white-tube telescopes with threaded back cells\u003c\/strong\u003e\u003cstrong\u003e \u003cspan style=\"text-decoration: underline;\"\u003eMUST BE SHIPPED to Explore Scientific\u003c\/span\u003e for installation of the back cell adapter. This will be arranged by customer service.\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNOTE: FPL53-165CF telescopes require the purchase of a new back cell adapter.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003eNOTE:\u003c\/strong\u003e The Explore Scientific \u003cspan data-mce-fragment=\"1\"\u003eTED15208CF telescope does \u003c\/span\u003enot require a back cell adapter. The 3-inch Self-Centering Focuser fits perfectly into the back cells.\u003c\/em\u003e\u003c\/p\u003e\n\u003c!--end tab--\u003e\u003c!--start tab--\u003e\n\u003cp\u003e\u003ciframe width=\"693\" height=\"390\" src=\"https:\/\/www.youtube.com\/embed\/_yj14Pqx2no\" title='Exclusive! The all new Explore Scientific 3\" Self Centering Focuser Upgrade - You WILL want one!'\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003c!--end tab--\u003e\u003c!--start tab--\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eItem Number\u003c\/span\u003e \u003cspan class=\"speccell\"\u003eES-FOC3\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eLifting Capacity\u003c\/span\u003e \u003cspan class=\"speccell\"\u003e17 lbs\/37.4 kg\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eDraw Tube Thread\u003c\/span\u003e \u003cspan class=\"speccell\"\u003eM82 x 1.25\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eDraw Tube Travel\u003c\/span\u003e \u003cspan class=\"speccell\"\u003e84.5 mm\/3.32 inches\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eDraw Tube Clear Interior Diameter\u003c\/span\u003e \u003cspan class=\"speccell\"\u003e76.2 mm\/3 inches\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eDraw Tube Baffles\u003c\/span\u003e \u003cspan class=\"speccell\"\u003e14\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eFocus System\u003c\/span\u003e \u003cspan class=\"speccell\"\u003eHelical rack \u0026amp; pinion\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eReduction Ratio\u003c\/span\u003e \u003cspan class=\"speccell\"\u003e9:1 with stainless steel ball bearings and shaft\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eAttachment mechanisms\u003c\/span\u003e \u003cspan class=\"speccell\"\u003eSelf-centering compression\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eWeight of focuser\u003c\/span\u003e \u003cspan class=\"speccell\"\u003e5.7 pounds including the 3-inch to 2-inch twist-lock adapter\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eCompatible with electric focusers\u003c\/span\u003e \u003cspan class=\"speccell\"\u003eYes\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spanrow\"\u003e\n\u003cspan class=\"speccell speccell-left\"\u003eTelescope compatibility\u003c\/span\u003e \u003cspan class=\"speccell\"\u003eExplore Scientific refractor telescopes 120 mm and larger; custom back cells available on request for other brands of refractor telescopes 120 mm and larger\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c!--end tab--\u003e\u003c!--start tab--\u003e","brand":"Explore Scientific","offers":[{"title":"3-inch Self-Centering Focuser for 152mm ES Refractors \/ Other Brand Refractors (No Back Cell Adapter)","offer_id":45643729109233,"sku":"ES-FOC3","price":599.99,"currency_code":"USD","in_stock":true},{"title":"3-inch Self-Centering Focuser with Back Cell Adapter for FCD100 127CF","offer_id":45643729142001,"sku":"ES-FOC3-BC100127","price":749.99,"currency_code":"USD","in_stock":false},{"title":"3-inch Self-Centering Focuser with Back Cell Adapter for White Tube ED127 and FCD-100.","offer_id":45643729174769,"sku":"ES-FOC3-BC100127T","price":749.99,"currency_code":"USD","in_stock":false},{"title":"3-inch Self-Centering Focuser with Back Cell Adapter for FPL53 165mm Refractor","offer_id":46191663972593,"sku":"ES-FOC3-BC53165","price":999.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0570\/5711\/6312\/files\/ES-FOC3_1.jpg?v=1736428898","url":"https:\/\/villohome.com\/products\/explore-scientific-3-inch-self-centering-focuser-es-foc3","provider":"Villohome","version":"1.0","type":"link"}