{"product_id":"svbony-sv165-40mm-mini-guide-scope","title":"SVBONY SV165 40mm Mini Guide Scope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Aperture\u003c\/li\u003e\n\u003cli\u003e160mm Focal Length (f\/4)\u003c\/li\u003e\n\u003cli\u003eAccepts 1.25\" and T2-Threaded Cameras\u003c\/li\u003e\n\u003cli\u003e12.5mm Back Focus\u003c\/li\u003e\n\u003cli\u003eWeighs 449.8g (15.87oz)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSvbony SV165 Mini Guide Scope 40mm for Deep Sky\u003c\/h2\u003e\n\u003cp\u003eThe Svbony SV165 Mini Guide Scope combines a 40mm aperture with a fast f\/4 focal ratio to deliver bright guide star images for precise autoguiding. Its 160mm focal length provides a wide field of view suitable for most imaging setups, while the fully multi-coated 2-element lens ensures high light transmission. Weighing just 449.8g and built from durable aluminum, this guide scope adds minimal weight to your mobile astrophotography rig.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBright, Wide-Field Guiding with a 40mm f\/4 System\u003c\/h3\u003e\n\u003cp\u003eThe 40mm aperture gathers significantly more light than common 30mm guide scopes, allowing your guide camera to detect fainter stars. This expanded selection of potential guide stars is critical in star-poor regions of the sky. The fast f\/4 focal ratio keeps guide exposures short, enabling more rapid guide corrections for sharper final images.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e160mm Focal Length:\u003c\/strong\u003e Provides a wide field of view, making it easy to find a suitable guide star without having to re-point the main telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Multi-Coated Optics:\u003c\/strong\u003e The 2-element lens design with full multi-coatings maximizes contrast and light throughput, ensuring guide stars are sharp and distinct against the background sky.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecise Focusing and Solid Connections: 12.5mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eAchieving sharp focus on your guide camera is managed by the front-part focuser, which provides 15mm of travel. Once focused, the 12.5mm of back focus is compatible with many popular guide cameras that have a 1.25\" nosepiece or T2 threads.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Connection Options:\u003c\/strong\u003e Accepts standard 1.25\" nosepieces or a direct T2-thread connection for a more rigid, tilt-free imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminum Construction:\u003c\/strong\u003e The sandblasted aluminum body weighs only 449.8g, adding minimal flexure or strain to your primary focuser or mounting rings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSvbony SV165 vs. ZWO 30mm Mini Guide Scope: More Aperture for Fainter Stars\u003c\/h3\u003e\n\u003cp\u003eWhile both are excellent compact guide scopes, they serve slightly different priorities. Your choice depends on whether you prioritize absolute minimum weight or maximum light-gathering ability.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO 30mm Mini Guide Scope Advantage:\u003c\/strong\u003e The primary advantage of the ZWO 30mm is its lower weight (approx. 250g) and more compact form factor, making it an excellent choice for the most portable star trackers or setups where every gram counts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSvbony SV165 Advantage:\u003c\/strong\u003e The SV165's 40mm aperture gathers nearly 78% more light than the 30mm ZWO. This is a decisive factor when you need to find a guide star in sparse fields or when using narrowband filters that dim starlight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal Length:\u003c\/strong\u003e The SV165's longer 160mm focal length provides a slightly higher image scale, which can improve guiding precision with cameras that have smaller pixels, assuming good seeing conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Svbony SV165's 40mm aperture?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e40mm aperture\u003c\/strong\u003e gathers more light than smaller 30mm guide scopes. This allows your autoguider to detect and lock onto fainter stars, giving you more options for guiding in any part of the sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Svbony SV165 to guide a wide-field refractor imaging the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The Svbony SV165's \u003cstrong\u003e160mm focal length\u003c\/strong\u003e provides a wide field of view that is an excellent match for guiding wide-field refractors. When imaging a large target like the North American Nebula, you'll have no trouble finding a suitable guide star within the guide scope's field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I focus the Svbony SV165 Mini Guide Scope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV165 uses a \u003cstrong\u003efront-part focuser\u003c\/strong\u003e. You achieve rough focus by sliding the front section in or out, which has \u003cstrong\u003e15mm of travel\u003c\/strong\u003e, and then lock it in place. Fine adjustments can be made by rotating the objective assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of cameras can I connect to the Svbony SV165?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe guide scope is designed for cameras with either a standard \u003cstrong\u003e1.25\" nosepiece\u003c\/strong\u003e or female \u003cstrong\u003eT2 (M42x0.75) threads\u003c\/strong\u003e. With 12.5mm of back focus, it's compatible with most compact planetary and guide cameras from brands like ZWO, QHY, or Svbony.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 160mm focal length of the SV165 suitable for guiding an 8\" f\/10 SCT on planets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it can work, a 160mm focal length is very short for guiding a telescope with a 2000mm+ focal length. For planetary imaging, where you need extremely precise guiding to resolve fine detail, a longer focal length guide scope or an \u003cstrong\u003eoff-axis guider (OAG)\u003c\/strong\u003e is generally recommended to achieve a better image scale match.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the 449.8g weight of the Svbony SV165 pose a problem for small mounts?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWeighing just under one pound (\u003cstrong\u003e449.8g\u003c\/strong\u003e), the SV165 is very lightweight. However, it is heavier than ultra-compact 30mm guide scopes. For small star trackers or mounts operating near their payload limit, you should account for this weight plus the weight of your guide camera to ensure stable tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e40 mm \/ 1.57 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e160 mm \/ 6.30 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Design\u003c\/td\u003e\n\u003ctd\u003e2-Element, Fully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Type\u003c\/td\u003e\n\u003ctd\u003eFront Part Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e12.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" \u0026amp; T2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003eSandblasting oxidation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e449.8g \/ 15.87oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Size\u003c\/td\u003e\n\u003ctd\u003e179x114x59mm \/ 7.05x4.49x2.32 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861232742685,"sku":"SV-W9125B","price":59.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV165-Mini-Guide-Scope-40mm-for-Deep-Sky-1_b831f0f7-4331-4dc4-8c1b-a10f8f06cf56.jpg?v=1788883397","url":"https:\/\/davidastro.com\/en-us\/products\/svbony-sv165-40mm-mini-guide-scope","provider":"David Astro","version":"1.0","type":"link"}