{"product_id":"svbony-sv550-122-apo-refractor-ota","title":"SVBONY SV550 122mm f\/7 Triplet APO Refractor Telescope OTA","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/F9381C_20260116101751_8223.webp?v=1791669966\" alt=\"SVBONY SV550 122 APO triplet refractor for visual observation and astrophotography\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe SVBONY SV550 122 is a 122 mm, 854 mm focal length apochromatic triplet refractor working at f\/7. Its fully multi-coated objective uses an FPL51 ED centre element between two correcting elements, and the optical tube carries a 2.5″ rack-and-pinion dual-speed focuser with 1:10 fine focus and 87 mm of travel. SVBONY rates resolution at 1.15 arc seconds, a visual limiting magnitude of 12.3 and a highest useful magnification of 244x.\u003c\/p\u003e\n\u003cp\u003eThe aluminium tube is CNC machined, measures 154 mm in outer diameter and weighs 6440 g (14.18 lb) net. It rides in split tube rings with 26 screw holes and a carry handle on a 300 mm V-style dovetail, has a retractable dew shield, and ships in a protective carry case with shoulder and hand straps.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage galaxies, nebulae and clusters:\u003c\/strong\u003e 854 mm frames mid-sized targets, and the SV209 0.8x reducer\/flattener widens that to f\/5.6 for faster imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eObserve visually:\u003c\/strong\u003e 122 mm of colour-corrected aperture gives bright, high-contrast views of the Moon, planets and double stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWant aperture you can still travel with:\u003c\/strong\u003e SVBONY designed the SV550 122 as a compact travel refractor, and the retracted dew shield shortens it for its case.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAre moving up from an 80 mm refractor:\u003c\/strong\u003e the 122 adds light grasp and resolution with the same style of focuser and accessory threads as the SV550 80.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt suits a confident first large refractor as well as an experienced imager's main deep-sky scope.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e122 mm f\/7 triplet apochromat:\u003c\/strong\u003e 854 mm focal length, FPL51 ED centre element, fully multi-coated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5″ rack-and-pinion focuser:\u003c\/strong\u003e dual speed with 1:10 fine focus on coaxial knobs, 87 mm travel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSplit tube rings and handle:\u003c\/strong\u003e 26 screw holes for guide scopes, finders and accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300 mm V-style dovetail:\u003c\/strong\u003e room to balance a camera and guide scope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ front adapter and M63x1 thread:\u003c\/strong\u003e the 2″ adapter takes diagonals and cameras; the M63x1 female thread takes the SV209 reducer\/flattener.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEAF ready:\u003c\/strong\u003e SVBONY shows installation of an electronic auto focuser in place of the focus knob.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield\u003c\/strong\u003e and a finder shoe on the focuser.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385784897381725555232590.jpg?v=1791669966\" alt=\"SVBONY SV550 122 APO 300mm dovetail and tube rings with 26 screw holes\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385784906495488411926031.jpg?v=1791669967\" alt=\"SVBONY SV550 122 APO 2.5 inch rack-and-pinion dual-speed focuser\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe SV550 122 is an air-spaced apochromatic triplet: an FPL51 ED element sits between two correcting elements to bring red, green and blue light to a common focus and keep false colour off bright stars and the lunar limb. Full multi-coating on the air-glass surfaces controls reflections and keeps contrast up, and the tube interior is blackened against stray light.\u003c\/p\u003e\n\u003cp\u003eAt f\/7 the native field is well suited to visual work and to imaging with the SV209 reducer\/flattener, which SVBONY specifies at 0.8x for this telescope, taking 854 mm to about 683 mm at f\/5.6 with 55 mm of back focus.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6382336968295659233955405.jpg?v=1791669967\" alt=\"SVBONY SV550 122 APO overview with multifunctional tube rings\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky imaging:\u003c\/strong\u003e galaxies, nebulae and star clusters at 854 mm, or at f\/5.6 with the SV209.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e Moon, planets and double stars up to SVBONY's rated 244x, plus bright deep-sky objects at low power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel and outreach:\u003c\/strong\u003e a refractor that needs no collimation and packs into its own case.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual:\u003c\/strong\u003e the 2″ front adapter accepts 2″ diagonals; eyepieces and diagonal are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging:\u003c\/strong\u003e remove the 2″ adapter to reach the M63x1 female thread for the SV209 0.8x reducer\/flattener (55 mm back focus).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto focus:\u003c\/strong\u003e the focuser accepts an EAF; SVBONY shows the knob slide-off installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e 300 mm V-style (Vixen-style) dovetail. At 6440 g before camera and accessories, a mount with comfortable payload headroom keeps guiding smooth.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccessories:\u003c\/strong\u003e the tube rings' 26 screw holes and the focuser finder shoe take guide scopes and finders such as the SVBONY SV165.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you want to confirm a camera and filter train against the SV209's 55 mm back focus, send us your setup and we will work out the spacing with you.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385784908590904909764432.jpg?v=1791669966\" alt=\"SVBONY SV550 122 APO 2 inch interface and M63x1 thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6382336860672493845533977.jpg?v=1791669967\" alt=\"SVBONY SV550 122 APO tube ring lock screw\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385784911183663287134031.jpg?v=1791669967\" alt=\"SVBONY SV550 122 APO EAF installation steps\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x SV550 122 APO optical tube with tube rings, handle and 300 mm dovetail\u003c\/li\u003e\n\u003cli\u003e1 x protective carry case with removable shoulder strap and hand strap\u003c\/li\u003e\n\u003cli\u003eFinder shoe on the focuser and retractable dew shield (fitted)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical tube only:\u003c\/strong\u003e no mount, diagonal, eyepiece or reducer is included. SVBONY's bundle sets and the add-ons on this page cover those.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field imaging:\u003c\/strong\u003e full-field astrophotography uses the SV209 0.8x reducer\/flattener on the M63x1 thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 6440 g net for the tube; the packed shipment is 10000 g gross.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDew:\u003c\/strong\u003e on humid Ontario nights a dew heater around the dew shield keeps the objective clear.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The tube arrives assembled in its rings on the dovetail. Drop it into a Vixen-style saddle, add a 2″ diagonal and eyepiece, and it is ready to observe; for imaging, swap the 2″ adapter for the SV209.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich flattener does it use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe SV209 0.8x reducer\/flattener for the SV550 122, which threads to the M63x1 connection and needs 55 mm of back focus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it for visual or imaging?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBoth. SVBONY designed it for visual observing and astrophotography.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I fit an electronic focuser?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The focuser accepts an EAF in place of the coarse focus knob.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it come with a case?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, a protective carry case with shoulder and hand straps is included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the outer diameter of the tube?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e154 mm, the figure to use when choosing a dew heater strip.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: a 122 mm f\/7 FPL51 triplet apochromat with a 2.5″ dual-speed focuser, rings, handle, 300 mm dovetail and case, ready for visual observing and, with the SV209 0.8x reducer\/flattener, deep-sky imaging at f\/5.6. Add a mount and your visual or imaging accessories to complete it.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"OTA","offer_id":67722251108463,"sku":"F9381C","price":1936.58,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/SV550-Ff9381C-0_20251210140405_4985.webp?v=1791670220","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv550-122-apo-refractor-ota","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}