{"product_id":"the-small-witness-sv165-30mm-guide-scope","title":"The Small Witness | SV165 30mm f\/4 Ultra-Mini Guide Scope with 120mm Focal Length","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp\u003eTracking Is the Whole Discipline. A mount can be perfectly polar aligned and a camera perfectly focused, and the image still walks if nothing is watching the stars while the shutter is open. Guiding is that watchman, and the guide scope is the eye it uses. The SV165 is built for the job rather than adapted to it: thirty millimetres of aperture, a 120mm focal length, an f\/4 light path that finds a guide star quickly in a crowded field.\u003c\/p\u003e\n\u003cp\u003eThe mechanical side is where small guide scopes usually fail, and this one is specified properly. The body is aluminium alloy and glass with a sandblasted oxidation finish, 92 by 56 by 78 millimetres and 342 grams on the scales, light enough that it does not strain a small mount or fight the imaging train for balance. Back focus is adjustable at 26mm, the helical focuser travels 45 millimetres, and the dovetail carries a 1\/4 inch screw hole for a standard shoe or bar.\u003c\/p\u003e\n\u003cp\u003eConnections cover the cameras people actually guide with. A 1.25 inch interface and an M42 by 0.75 male thread accept the SV305, ZWO, Orion, QYH and comparable auto guiding cameras, and the fully broadband multi-coated optics keep the star field bright enough for the guide software to hold a lock on a dim target. For a rig that images at a long focal length, this is the difference between round stars on a five minute exposure and a night of deleting frames.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eA guide scope does not take pictures. It decides whether the pictures are worth keeping.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr style=\"margin: 28px 0; border: 0; border-top: 1px solid #e6e6e6;\"\u003e\n\u003cdiv class=\"product-features\"\u003e\n\u003ch3 style=\"font-size: 19px; margin: 0 0 14px;\"\u003eWhat the Optics Give You\u003c\/h3\u003e\n\u003cul style=\"list-style: none; padding: 0; margin: 0 0 8px;\"\u003e\n\u003cli style=\"padding: 8px 0 8px 22px; border-bottom: 1px solid #f0f0f0; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #1a3a5c;\"\u003e✦\u003c\/span\u003e30mm aperture with a 120mm focal length and f\/4 light path for fast guide star acquisition\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0 8px 22px; border-bottom: 1px solid #f0f0f0; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #1a3a5c;\"\u003e✦\u003c\/span\u003eFully broadband multi-coated optics with an aluminium alloy and glass body\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0 8px 22px; border-bottom: 1px solid #f0f0f0; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #1a3a5c;\"\u003e✦\u003c\/span\u003eFront part helical focuser with 45mm of travel\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0 8px 22px; border-bottom: 1px solid #f0f0f0; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #1a3a5c;\"\u003e✦\u003c\/span\u003eAdjustable 26mm back focus for camera spacing\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0 8px 22px; border-bottom: 1px solid #f0f0f0; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #1a3a5c;\"\u003e✦\u003c\/span\u003e1.25 inch interface and M42 by 0.75 male thread for SV305, ZWO, Orion and QYH guide cameras\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0 8px 22px; border-bottom: 1px solid #f0f0f0; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #1a3a5c;\"\u003e✦\u003c\/span\u003e1\/4 inch dovetail screw hole for standard finder shoes and guide bars\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0 8px 22px; border-bottom: 1px solid #f0f0f0; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #1a3a5c;\"\u003e✦\u003c\/span\u003e342 gram weight and a 92 x 56 x 78 mm footprint that leaves mount capacity for the imaging train\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003chr style=\"margin: 28px 0; border: 0; border-top: 1px solid #e6e6e6;\"\u003e\n\u003cdiv class=\"product-specs\"\u003e\n\u003ch3 style=\"font-size: 19px; margin: 0 0 14px;\"\u003eOptical Record\u003c\/h3\u003e\n\u003cul style=\"list-style: none; padding: 0; margin: 0;\"\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eModel\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003eSV165\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eObjective lens diameter\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003e30mm\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eFocal length\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003e120mm\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eAperture ratio\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003ef\/4\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eCoating\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003eFMC, fully broadband multi-coated\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eBack focus\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003e26mm, adjustable\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eTube travel\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003e112.2mm, helical focus stroke 45mm\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eFocuser type\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003eFront part focuser\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eCamera interface\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003e1.25 inch or M42 x 0.75 mount\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eBody size\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003e92 x 56 x 78 mm\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eNet weight\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003e342g (0.75 lb)\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eMaterial and finish\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003eAluminium alloy and glass, sandblasted oxidation\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"display: flex; padding: 9px 0; border-bottom: 1px solid #f0f0f0; font-size: 15px;\"\u003e\n\u003cspan style=\"flex: 0 0 210px; color: #6a6a6a;\"\u003eDovetail\u003c\/span\u003e\u003cspan style=\"flex: 1; color: #232323;\"\u003e\u003cstrong\u003e1\/4 inch screw hole\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003chr style=\"margin: 28px 0; border: 0; border-top: 1px solid #e6e6e6;\"\u003e\n\u003cdiv class=\"product-applications\"\u003e\n\u003ch3 style=\"font-size: 19px; margin: 0 0 14px;\"\u003eWho Guides With This Scope\u003c\/h3\u003e\n\u003cp\u003eDeep sky imagers add a guide scope when their mount tracks well enough for the short exposures but not well enough for the long ones, which describes most portable set-ups. Narrowband photographers use a small guide scope because the guide camera has to hold a star for twenty minute sub-frames. Travelling astronomers choose it for the weight and the footprint, since every gram removed from the top of the rig buys tracking stability below it. It is also the sensible first guide scope for someone stepping up from unguided imaging, because the 1.25 inch and M42 interfaces accept the camera they probably already own, and the f\/4 optics make the search for a usable guide star quick rather than fiddly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr style=\"margin: 28px 0; border: 0; border-top: 1px solid #e6e6e6;\"\u003e\n\u003cdiv class=\"product-faq\"\u003e\n\u003ch3 style=\"font-size: 19px; margin: 0 0 16px;\"\u003eAstrophotography Questions\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: 600; color: #1a3a5c;\"\u003eQ: Which guide cameras will fit?\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #3a3a3a;\"\u003eA: The scope accepts 1.25 inch mounted cameras and cameras with an M42 by 0.75 thread, which covers the SV305, ZWO, Orion, QYH and comparable auto guiding models. Message us with your camera if you are unsure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: 600; color: #1a3a5c;\"\u003eQ: Do I need a separate guide scope at all?\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #3a3a3a;\"\u003eA: If your mount holds round stars for the exposure length you use, you do not. If you are deleting frames because the stars are elongated, guiding is the fix, and a guide scope is where it starts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: 600; color: #1a3a5c;\"\u003eQ: How do I focus it?\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #3a3a3a;\"\u003eA: Focus with the front part helical focuser, which provides 45mm of travel. Set back focus at 26mm and adjust from there, then lock it down before the session, because the focus point barely shifts once the camera is seated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: 600; color: #1a3a5c;\"\u003eQ: Will it fit my finder shoe?\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #3a3a3a;\"\u003eA: The dovetail includes a 1\/4 inch screw hole, so it mounts on a standard shoe or a guide bar. If your rig uses a different bracket, tell us what you are mounting to and we will confirm the fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: 600; color: #1a3a5c;\"\u003eQ: Is it suitable for guiding a long focal length scope?\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #3a3a3a;\"\u003eA: The 120mm focal length and 30mm aperture are designed for guiding rather than for imaging flexibility. For long focal length imaging, use the guide software settings to suit the guide scale, and keep the scope firmly mounted so flexure does not enter the system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: 600; color: #1a3a5c;\"\u003eQ: What is included in the box?\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #3a3a3a;\"\u003eA: The guide scope as listed. Send us a message with the model and we will confirm the exact contents for the variant you are ordering, so that nothing you need is a surprise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-gallery\" style=\"margin-top: 34px; text-align: center;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S43a98833cef04b839ed5da4f04e1ea26g.webp?v=1778376636\" alt=\"\" style=\"max-width: 100%; height: auto; margin: 0 0 14px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/H275b1755bd114a45a702dfdb4f933d2dS.webp?v=1778376636\" alt=\"\" style=\"max-width: 100%; height: auto; margin: 0 0 14px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/H6dc580c8606f4d419eee024d6bceea6fq.webp?v=1778376636\" alt=\"\" style=\"max-width: 100%; height: auto; margin: 0 0 14px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/H04dc5107e9d0411593fb1761741b902c0.webp?v=1778376636\" alt=\"\" style=\"max-width: 100%; height: auto; margin: 0 0 14px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Hcdd6474328974a1d9de988de1a0a19e6x.webp?v=1778376636\" alt=\"\" style=\"max-width: 100%; height: auto; margin: 0 0 14px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S55f0acfdab5a4bc09fa37d02a99101a3J.webp?v=1778376636\" alt=\"\" style=\"max-width: 100%; height: auto; margin: 0 0 14px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S07dc5850c28248408d111a26c7f7b5baB.webp?v=1778376636\" alt=\"\" style=\"max-width: 100%; height: auto; margin: 0 0 14px; display: block;\"\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-promise\" style=\"margin-top: 34px; padding: 22px 24px; background: #f7f8fa; border-left: 3px solid #1a3a5c;\"\u003e\n\u003ch3 style=\"font-size: 17px; margin: 0 0 12px; color: #1a3a5c;\"\u003eThe EastSupplier Promise\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 10px; color: #3a3a3a;\"\u003eEvery unit in this listing is inspected and packed by our own cross-border team in China before it leaves the warehouse. We hold the stock, we handle the export paperwork, and we answer technical questions directly rather than routing you through a marketplace resolution desk.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 10px; color: #3a3a3a;\"\u003eOrders ship with tracking, and quantities above ten units are quoted individually so that shipping and duties are confirmed before you pay. If you are buying for a workshop, a studio, a fleet, or a service bay, tell us what you need and we will confirm availability, lead time, and landed cost.\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #3a3a3a;\"\u003eWholesale, OEM, and multi-unit inquiries: \u003cstrong\u003eservice@eastsupplier.com\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\":\"https:\/\/schema.org\",\"@graph\":[\n{\"@type\":\"Product\",\"name\":\"The Small Witness | SV165 30mm f\/4 Ultra-Mini Guide Scope with 120mm Focal Length\",\"description\":\"SV165 30mm f\/4 ultra mini guide scope with 120mm focal length, 26mm adjustable back focus, 45mm helical focus travel and 1.25 inch and M42 interfaces for SV305, ZWO, Orion and QYH auto guiding cameras.\",\"sku\":\"4001016979552-SV165-CN\",\"brand\":{\"@type\":\"Brand\",\"name\":\"EastSupplier\"},\"image\":[\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S43a98833cef04b839ed5da4f04e1ea26g.webp?v=1778376636\", \"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/H275b1755bd114a45a702dfdb4f933d2dS.webp?v=1778376636\", \"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/H6dc580c8606f4d419eee024d6bceea6fq.webp?v=1778376636\"],\"url\":\"https:\/\/eastsupplier.com\/products\/the-small-witness-sv165-30mm-guide-scope\",\"offers\":{\"@type\":\"AggregateOffer\",\"priceCurrency\":\"USD\",\"lowPrice\":\"323.11\",\"highPrice\":\"323.11\",\"offerCount\":\"1\",\"availability\":\"https:\/\/schema.org\/InStock\",\"itemCondition\":\"https:\/\/schema.org\/NewCondition\",\"url\":\"https:\/\/eastsupplier.com\/products\/the-small-witness-sv165-30mm-guide-scope\",\"seller\":{\"@type\":\"Organization\",\"name\":\"EastSupplier\",\"url\":\"https:\/\/eastsupplier.com\"}},\"aggregateRating\":{\"@type\":\"AggregateRating\",\"ratingValue\":\"4.8\",\"reviewCount\":\"3\",\"bestRating\":\"5\",\"worstRating\":\"1\"}},\n{\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/eastsupplier.com\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"The Small Witness | SV165 30mm f\/4 Ultra-Mini Guide Scope with 120mm Focal Length\",\"item\":\"https:\/\/eastsupplier.com\/products\/the-small-witness-sv165-30mm-guide-scope\"}]}\n]}\n\u003c\/script\u003e","brand":"EastSupplier Platform","offers":[{"title":"SV165 \/ CN","offer_id":49130789568735,"sku":"4001016979552-SV165-CN","price":323.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S43a98833cef04b839ed5da4f04e1ea26g.webp?v=1778376636","url":"https:\/\/eastsupplier.com\/pt-fr\/products\/the-small-witness-sv165-30mm-guide-scope","provider":"EastSupplier Platform","version":"1.0","type":"link"}