{"product_id":"stellalyra-10-f-12-m-lrc-classical-cassegrain-carbon-truss-telescope-ota","title":"StellaLyra 10\" f\/12 M-LRC Classical Cassegrain Carbon Truss Telescope OTA","description":"\u003cstyle\u003e\n.dcs-cc10t{max-width:1120px;margin:0 auto;color:#243445;font:inherit;line-height:1.7;text-align:left;overflow-wrap:anywhere}\n.dcs-cc10t *{box-sizing:border-box}.dcs-cc10t h2,.dcs-cc10t h3{color:#091725;line-height:1.25;letter-spacing:normal;text-align:left}\n.dcs-cc10t h2{font-size:clamp(25px,3vw,34px);margin:0 0 18px}.dcs-cc10t h3{font-size:23px;margin:0 0 16px}\n.dcs-cc10t p{margin:0 0 16px}.dcs-cc10t figure{margin:0;background:#fff;border:1px solid #e0e5e9;border-radius:12px;overflow:hidden}\n.dcs-cc10t img{display:block;width:100%;height:auto;max-width:600px;margin:auto;object-fit:contain}\n.dcs-cc10t .cc10t-feature,.dcs-cc10t .cc10t-intro{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:clamp(20px,4vw,40px);align-items:center;margin:0 0 38px}\n.dcs-cc10t .cc10t-intro{padding:24px;background:#091725;border-top:4px solid #c89524;border-radius:12px}\n.dcs-cc10t .cc10t-intro h2,.dcs-cc10t .cc10t-intro p{color:#fff!important}\n.dcs-cc10t .cc10t-label{font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:700}\n.dcs-cc10t .cc10t-panel{background:#f3f5f7;border-radius:12px;padding:24px;margin:0 0 32px}\n.dcs-cc10t ul{padding-left:22px;margin:0 0 16px}.dcs-cc10t li{margin-bottom:8px}\n.dcs-cc10t table{border-collapse:collapse;width:100%;table-layout:fixed;margin:16px 0 28px;font-size:15px}\n.dcs-cc10t th,.dcs-cc10t td{padding:10px 12px;border-bottom:1px solid #dce2e8;text-align:left;vertical-align:top;white-space:normal}\n.dcs-cc10t th{background:#f3f5f7;color:#091725}.dcs-cc10t th[scope=row]{width:42%}\n.dcs-cc10t details{border-bottom:1px solid #dce2e8;padding:16px 0}.dcs-cc10t summary{cursor:pointer;font-weight:700;color:#091725}.dcs-cc10t details p{margin:12px 0 0}\n.dcs-cc10t .cc10t-note{border-left:3px solid #c89524;padding:14px 18px;background:#fff8e8;margin:28px 0}\n.dcs-cc10t .cc10t-links{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}.dcs-cc10t .cc10t-links a{padding:12px 18px;border-radius:6px;background:#c89524;color:#091725!important;font-weight:700;text-decoration:none!important;min-height:44px}\n.dcs-cc10t .cc10t-links a:last-child{background:#f0f3f6}.dcs-cc10t a:focus-visible,.dcs-cc10t summary:focus-visible{outline:3px solid #2874aa;outline-offset:4px}\n@media(max-width:600px){.dcs-cc10t .cc10t-intro,.dcs-cc10t .cc10t-panel{padding:18px}.dcs-cc10t th,.dcs-cc10t td{padding:9px 7px;font-size:14px}}\n.dcs-cc10t figcaption{padding:12px 16px;color:#243445;background:#fff;font-size:14px;line-height:1.5}\u003c\/style\u003e\n\u003csection class=\"dcs-cc10t\"\u003e\n\u003cdiv class=\"cc10t-intro\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"cc10t-label\"\u003eStellaLyra · 10-inch f\/12 M-LRC Classical Cassegrain\u003c\/p\u003e\n\u003ch2\u003eBuild a dedicated setup for close-up lunar and planetary work.\u003c\/h2\u003e\n\u003cp\u003eThe StellaLyra 10-inch carbon-truss Classical Cassegrain combines a 250mm aperture with a 3045mm focal length and nominal f\/12 focal ratio. It is a substantial optical tube for observers and imagers who want to concentrate on smaller targets and fine detail.\u003c\/p\u003e\n\u003cp\u003eChoose it as part of a complete system. A suitable mount, carefully selected rear accessories and a practical installation plan are central to enjoying a telescope of this size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-10-f12-truss-cassegrain-hero.jpg?v=1789824691\" alt=\"StellaLyra 10-inch f\/12 carbon-truss Classical Cassegrain optical tube\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc10t-panel\"\u003e\n\u003ch3\u003eMake three metres of focal length a deliberate choice.\u003c\/h3\u003e\n\u003cp\u003eA long focal length gives a target more space on the same camera sensor and higher magnification with the same eyepiece. That is useful for a close study of lunar terrain, planets or double stars, while a larger subject may need a different framing strategy.\u003c\/p\u003e\n\u003cp\u003eStart with the targets you actually want to observe or record. For imaging, check their size against your camera’s field of view. For visual use, plan a useful range of eyepieces and the tracking needed to keep a subject comfortably in view.\u003c\/p\u003e\n\u003cp\u003eExtra image scale only helps when seeing, focus and tracking support it. On an unsteady night, a smaller, sharper image can reveal more than a highly magnified blur.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc10t-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-10-f12-truss-cassegrain-truss.jpg?v=1789824712\" alt=\"Side view of StellaLyra 10-inch Classical Cassegrain showing carbon-fibre truss and mounting rails\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eAn open carbon-truss structure.\u003c\/h3\u003e\n\u003cp\u003eThe carbon-fibre truss connects the optical assemblies, with Losmandy-style mounting rails above and below.\u003c\/p\u003e\n\u003cp\u003ePlan protection for the exposed structure during storage and transport. Assess nearby lights and your observing environment when deciding whether additional light control is needed. Any accessory fitted around the open frame must remain clear of the optical path and moving equipment.\u003c\/p\u003e\n\u003cp\u003eCarbon construction does not remove the need to check focus as conditions change. Allow the complete telescope to settle outdoors before judging its best performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003ePlan the working load and handling together.\u003c\/h3\u003e\n\u003cp\u003ePublished tube weight is \u003cstrong\u003e17.2kg\u003c\/strong\u003e. Add the diagonal, eyepiece or camera, guiding equipment and other attached accessories when assessing mount suitability.\u003c\/p\u003e\n\u003cp\u003eCheck saddle compatibility, counterweight requirements and balance range before installation. Decide how the telescope will be supported while it is secured or removed, and whether a permanent setup would better suit your routine than repeated transport.\u003c\/p\u003e\n\u003cp\u003eBalance with the actual rear equipment attached. Check that the focuser, accessories and cables remain clear of the mount, tripod or pier throughout the intended pointing range.\u003c\/p\u003e\n\u003cdiv class=\"cc10t-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-10-f12-truss-cassegrain-focuser.jpg?v=1789824722\" alt=\"Rear focuser on StellaLyra 10-inch f\/12 M-LRC Classical Cassegrain\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eFine focusing with the primary held fixed.\u003c\/h3\u003e\n\u003cp\u003eThe 3.25-inch dual-speed linear-bearing Crayford focuser provides coarse and fine manual control while the primary mirror stays fixed.\u003c\/p\u003e\n\u003cp\u003eSupport the camera or diagonal during attachment, secure every connection and keep cable weight off the focuser. Assess the complete accessory train at different pointing angles. The focuser’s diameter alone does not specify an acceptable camera payload.\u003c\/p\u003e\n\u003cp\u003eIf you intend to automate focus, confirm the motor, bracket and coupling for the supplied focuser before buying. Record a useful starting focus position, then refine it on the target rather than assuming yesterday’s setting will be exact.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc10t-panel\"\u003e\n\u003ch3\u003ePractical eyepiece examples.\u003c\/h3\u003e\n\u003cp\u003eMagnification is the telescope’s focal length divided by the eyepiece focal length. At the native focal length:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eEyepiece focal length\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eApproximate magnification\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e30mm\u003c\/td\u003e\n\u003ctd\u003e102×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003ctd\u003e152×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003ctd\u003e254×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eEyepieces are separate purchases. These are calculated examples, not guaranteed usable powers on every night. Begin at lower power, centre the target and increase magnification while the view continues to improve.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc10t-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-10-f12-truss-cassegrain-rear.jpg?v=1789824702\" alt=\"Rear assembly of StellaLyra 10-inch carbon-truss Classical Cassegrain\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eConfigure the rear optical path.\u003c\/h3\u003e\n\u003cp\u003eTwo 25mm and one 50mm extension rings are supplied. Select the combination that positions the focuser appropriately for your diagonal or camera arrangement.\u003c\/p\u003e\n\u003cp\u003eInstalling every ring is not a universal setup. Assemble the intended accessories, establish where focus falls and leave useful focuser travel available. Keep notes of successful arrangements so a change between observing and imaging is repeatable.\u003c\/p\u003e\n\u003cp\u003eIf additional optical elements are fitted, check their own spacing and connection requirements separately from the telescope’s mechanical extension.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003ePrepare the system before a long imaging run.\u003c\/h3\u003e\n\u003cp\u003ePractise acquiring a target at the native focal length before adding amplification. A small camera sensor can give a very narrow field, so an accurately aligned finder and steady tracking are valuable.\u003c\/p\u003e\n\u003cp\u003eUse short test captures to establish focus and exposure. Choose a Barlow around the camera’s pixel size and the seeing. For long-exposure work, assess guiding and the full image field before committing to a sequence.\u003c\/p\u003e\n\u003cp\u003eThe supplier quotes a 55mm illuminated field. Illumination is not a guarantee of a flat, fully corrected image across a large sensor, and adapters can restrict the usable field. Check actual corner performance and the complete optical train for your proposed camera.\u003c\/p\u003e\n\u003ch3\u003eAlignment and cooling still matter.\u003c\/h3\u003e\n\u003cp\u003eAllow time for thermal settling and assess a well-centred star before making alignment changes. Use a procedure appropriate to a Classical Cassegrain, and distinguish focus, seeing and tracking problems from collimation.\u003c\/p\u003e\n\u003cp\u003eMake one adjustment at a time and keep a record. Avoid disturbing an already sound alignment simply because a low-altitude target is shimmering or the telescope has just been brought outside.\u003c\/p\u003e\n\u003ch3\u003eIncluded and purchased separately\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eSupplied with the OTA\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eChoose separately\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCarbon-truss Classical Cassegrain and focuser\u003c\/td\u003e\n\u003ctd\u003eSuitable mount and tripod or pier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpper and lower rails; finder base\u003c\/td\u003e\n\u003ctd\u003eFinder and any guiding equipment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2-inch to 1.25-inch adapter\u003c\/td\u003e\n\u003ctd\u003eDiagonal and eyepieces for visual use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTwo 25mm and one 50mm extension rings\u003c\/td\u003e\n\u003ctd\u003eCamera, connection adapters and any amplification optics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSpecifications at a glance\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDesign \/ aperture\u003c\/th\u003e\n\u003ctd\u003eClassical Cassegrain \/ 250mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFocal length \/ nominal ratio\u003c\/th\u003e\n\u003ctd\u003e3045mm \/ f\/12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eMirror material\u003c\/th\u003e\n\u003ctd\u003eQuartz primary and secondary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePublished length \/ end-ring diameter\u003c\/th\u003e\n\u003ctd\u003e690mm \/ 400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePublished tube weight\u003c\/th\u003e\n\u003ctd\u003e17.2kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eBefore ordering\u003c\/h3\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this a complete observing or imaging kit?\u003c\/summary\u003e\u003cp\u003eNo. It is an optical tube assembly. Choose the mount, finder, diagonal and eyepieces or camera separately, and budget for the adapters and support equipment needed by your actual setup.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes the truss make it an easy portable telescope?\u003c\/summary\u003e\u003cp\u003eAssess the size and total working weight against your own transport and installation arrangements. Plan secure support during fitting and removal, plus suitable protection for the open structure.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShould I compare it with the 8-inch model?\u003c\/summary\u003e\u003cp\u003eCompare target framing, mount requirements and the full kit’s handling. The \u003ca href=\"\/products\/stellalyra-8-f-12-m-lrs-classical-cassegrain-telescope-ota\"\u003e8-inch Classical Cassegrain\u003c\/a\u003e is a smaller option worth considering when storage and transport shape your observing routine.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"cc10t-note\"\u003e\n\u003cstrong\u003eSupplier-stock availability\u003c\/strong\u003e\u003cp\u003eAvailability reflects supplier stock and may change. Contact Dark Clear Skies to confirm dispatch timing if you need the telescope for a particular date.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc10t-links\"\u003e\n\u003ca href=\"\/pages\/stellalyra\"\u003eCompare the StellaLyra range\u003c\/a\u003e\u003ca href=\"mailto:contact@darkclearskies.co.uk?subject=StellaLyra%2010-inch%20truss%20Classical%20Cassegrain\"\u003eDiscuss your observing system\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n","brand":"StellaLyra","offers":[{"title":"Default Title","offer_id":55665193746808,"sku":null,"price":2799.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-10-f12-truss-cassegrain-hero.jpg?v=1789824691","url":"https:\/\/www.darkclearskies.co.uk\/products\/stellalyra-10-f-12-m-lrc-classical-cassegrain-carbon-truss-telescope-ota","provider":"Dark Clear Skies ","version":"1.0","type":"link"}