{"product_id":"svbony-sv165-40mm-f-4-mini-guide-scope","title":"SVBONY SV165 40mm f\/4 Mini Guide Scope","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327453447745001266222.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm f\/4 mini guide scope key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV165 40 mm is a compact f\/4 guide scope for autoguiding deep-sky imaging rigs. Its two-element, fully multi-coated objective gives a 160 mm focal length. Focus is set with a front-part focuser that has a scale and locking ring, with 15 mm of travel, and the camera end accepts 1.25″ nosepieces and T2 threads with 12.5 mm of back focus. The aluminium body measures 179 x 114 x 59 mm and weighs 449.8 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327455350751352047176.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope product overview\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327456996883403520596.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope overview for autoguiding\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327460209399597199415.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope overview for deep-sky imaging\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you image deep-sky targets with a telescope of up to 700 mm focal length and want a guide scope with a little more aperture than the 30 mm version, for more guide-star choice in sparse fields, while keeping weight under half a kilogram.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 mm f\/4 objective:\u003c\/strong\u003e two-element, fully multi-coated, 160 mm focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront focuser with scale and locking ring:\u003c\/strong\u003e 15 mm of travel; the scale lets you return to a known focus position.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ and T2 camera interface\u003c\/strong\u003e with 12.5 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSix-point guide ring:\u003c\/strong\u003e adjusts alignment of the guide scope relative to the main telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium body\u003c\/strong\u003e with a sandblasted, oxidized finish; 449.8 g.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327461724778903271809.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope key features and design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327463293662172879623.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope front focuser with scale and locking ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327464630691928962058.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope six-point guide ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA two-element, fully multi-coated 40 mm objective at f\/4 gives 160 mm of focal length. The extra aperture over a 30 mm guide scope collects more light per guide star, while the fast focal ratio keeps guide exposures short. SVBONY rates it for main telescopes with focal lengths up to 700 mm, a range where a 160 mm guide focal length keeps the guiding image scale close enough to the imaging scale for accurate corrections.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327466423697405197872.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm f\/4 guide scope optical design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327468437875912385236.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope two-element multi-coated objective\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327469841101124034156.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope 160 mm focal length guiding\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutoguiding\u003c\/strong\u003e deep-sky astrophotography with PHD2 or similar software.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuiding refractors and short reflectors\u003c\/strong\u003e up to 700 mm focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact imaging rigs\u003c\/strong\u003e where weight on the main telescope matters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327471357848308092657.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope recommended uses for autoguiding\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327481209681613042972.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope on a compact imaging rig\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327482965948628795181.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope guiding refractors up to 700 mm\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain telescope:\u003c\/strong\u003e SVBONY specifies it for telescopes with focal lengths within 700 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuide cameras:\u003c\/strong\u003e the 1.25″ and M42 interface accepts guide cameras such as the SVBONY SV305 Pro and ZWO, QHY and Orion models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocusing:\u003c\/strong\u003e SVBONY notes that T2 extension tubes can assist in reaching focus with some cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 12.5 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327484640307203064516.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope camera compatibility\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327485985944692052208.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope specifications and back focus\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381327487280810042364104.jpg?v=1791667876\" alt=\"SVBONY SV165 40mm guide scope dimensions\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuide camera sold separately:\u003c\/strong\u003e this listing is the guide scope alone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal-length range:\u003c\/strong\u003e it is specified for main telescopes up to 700 mm; longer focal lengths are usually better served by an off-axis guider. Get in touch if you would like help choosing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage contents:\u003c\/strong\u003e SVBONY does not publish a contents list for this model.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Mount the scope, insert or thread the guide camera, focus on a bright star using the front focuser, and lock it with the locking ring. The focus scale lets you return to the same position next session.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is it different from the SV165 30 mm?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt has 40 mm of aperture and 160 mm focal length versus 30 mm and 120 mm, and a front-part focuser with a scale instead of a helical focuser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat telescopes does it suit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY specifies main telescopes with focal lengths up to 700 mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich guide cameras fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eCameras with a 1.25″ nosepiece or T2\/M42 thread, including the SVBONY SV305 Pro and ZWO, QHY and Orion guide cameras.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 40 mm f\/4 guide scope with 160 mm focal length, a scaled front focuser and 1.25″\/T2 camera fit, for guiding imaging telescopes up to 700 mm focal length once a guide camera is added.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67721422995567,"sku":"W9125B","price":84.08,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9125b-1_20250908151840_0858_20260814153638_0182.webp?v=1791665185","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv165-40mm-f-4-mini-guide-scope","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}