{"product_id":"svbony-sv106-50mm-guide-scope-with-helical-focuser","title":"SVBONY SV106 50mm Guide Scope with Helical Focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e50mm Aperture\u003c\/li\u003e\n\u003cli\u003e190mm Focal Length (F3.8)\u003c\/li\u003e\n\u003cli\u003eZero-Flexure Helical Focuser\u003c\/li\u003e\n\u003cli\u003e8mm Focuser Travel\u003c\/li\u003e\n\u003cli\u003eIncludes Mounting Rings and Dovetail\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 SV106 Guide Scope 50mm with Helical Focuser\u003c\/h2\u003e\n\u003cp\u003eWith a 50mm aperture and a fast 190mm focal length (F3.8), the SVBONY SV106 Guide Scope delivers bright, wide-field views essential for locating faint guide stars. Its helical focuser provides 8mm of precise, repeatable travel for achieving sharp focus, while the standard 1.25-inch connection and integrated T-threads ensure a rigid connection to modern guide cameras.\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\u003eFast F3.8 Optics: Finding Guide Stars at 50mm\u003c\/h3\u003e\n\u003cp\u003eThe SV106's optical design is centered on speed and a wide field of view. The fast F3.8 focal ratio of its 50mm achromatic objective gathers ample light, making dimmer stars visible and increasing your odds of finding a suitable guide star in any part of the sky. This combination is ideal for guiding wide-field refractors and astrographs where a broad view is necessary to match the imaging field.\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\u003eZero-Flexure Helical Focuser with 8mm of Travel\u003c\/h3\u003e\n\u003cp\u003eMechanical flexure is the primary enemy of accurate guiding. The SV106 guide scope uses a helical focuser that eliminates the sag and shift common in standard drawtube designs. You achieve focus by rotating the barrel, not by sliding it, which maintains perfect alignment. With 8mm of fine adjustment controlled by a knurled ring and a thumbscrew to lock it in place, your guide camera remains rigidly fixed all night.\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\u003eReady to Mount: Rings for the 54.5mm Tube\u003c\/h3\u003e\n\u003cp\u003eThe SV106 arrives ready for immediate integration into your imaging rig. It includes a set of sturdy tube rings for its 54.5mm tube and a dovetail rail compatible with most standard finder scope bases. Nylon-tipped metal thumbscrews allow for precise aiming of the guide scope without marring the tube's finish. For connecting your camera, the focuser accepts standard 1.25-inch nosepieces and features male T-threads for a direct, secure attachment.\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\u003eSV106 Guide Scope vs. an Off-Axis Guider (OAG)\u003c\/h3\u003e\n\u003cp\u003eChoosing between a guide scope and an OAG involves a fundamental trade-off. An OAG uses the main telescope's light path, making it immune to differential flexure between two separate optical tubes, which is its primary advantage for very long focal length systems.\u003c\/p\u003e\n\u003cp\u003eThe SV106 guide scope, however, offers a significant advantage in usability. Its independent, wide field of view makes finding a suitable guide star dramatically easier than searching for one in the narrow, dim periphery of an OAG's pick-off prism. For portable setups and telescopes under 1500mm focal length, a well-mounted guide scope like the SV106 provides a more straightforward and often more successful guiding experience.\u003c\/p\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 kind of cameras work with the SV106 50mm Guide Scope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV106 is compatible with nearly all dedicated astronomy guide cameras. You can connect a camera using either a standard \u003cstrong\u003e1.25-inch nosepiece\u003c\/strong\u003e or by threading it directly onto the focuser's \u003cstrong\u003emale T-threads (M42x0.75)\u003c\/strong\u003e for the most secure, flex-free connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the SV106 Guide Scope to my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV106 includes tube rings and a dovetail mounting rail. This rail is designed to fit into a standard finder scope base (like those from Vixen, Synta, or Orion). Simply slide the rail into your existing finder base and tighten the screws to secure it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV106's 190mm focal length suitable for guiding an 8\" SCT on the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice for that scenario. An 8\" SCT has a long focal length, which can make finding guide stars difficult with an OAG. The SV106's wide 190mm field of view makes it easy to find a bright guide star near M42. The key is to ensure the guide scope is mounted as rigidly as possible to the main telescope to prevent differential flexure during long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the SV106's helical focuser over a standard one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard drawtube focuser can tilt or sag as it extends, causing the guide star to shift and ruining your guiding accuracy. The \u003cstrong\u003ehelical focuser\u003c\/strong\u003e on the SV106 rotates to focus without changing its length, providing a \u003cstrong\u003ezero-flexure\u003c\/strong\u003e mechanism. This ensures that once you achieve sharp focus, your guide camera remains perfectly aligned with the guide scope's optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV106 50mm guide scope for visual observation?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. With a 1.25-inch eyepiece, the SV106 becomes a compact, fast F3.8 rich-field refractor. It's perfect for sweeping across the Milky Way or viewing large star clusters like the Pleiades (M45) and other expansive deep-sky objects from a dark site.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I choose the SV106 guide scope instead of an Off-Axis Guider (OAG)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou would choose the SV106 for its ease of use. Finding a suitable guide star with its wide, independent field of view is significantly simpler and faster than hunting for one with an OAG's small pick-off prism, especially on star-poor targets. While an OAG eliminates differential flexure, the SV106 offers a much more user-friendly experience for most imaging setups.\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\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e50mm \/ 1.97in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e190mm \/ 7.48in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003eF3.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAchromatic Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully multi-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Type\u003c\/td\u003e\n\u003ctd\u003eHelical Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003e1.25-inch \u0026amp; T-Threads (M42x0.75)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Diameter\u003c\/td\u003e\n\u003ctd\u003e54.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e240mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Use\u003c\/td\u003e\n\u003ctd\u003eDeep Sky Autoguiding\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e50mm F3.8 Guide Scope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDovetail Mounting Rail\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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":52861232644381,"sku":"SV-F9177A","price":57.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV106-Guide-Scope-50mm-with-Helical-Focuser-for-Astronomical-Telescope-1_d0abbe71-e749-4dec-a643-d3f231aba9e2.jpg?v=1788659863","url":"https:\/\/davidastro.com\/fr-us\/products\/svbony-sv106-50mm-guide-scope-with-helical-focuser","provider":"David Astro","version":"1.0","type":"link"}