{"product_id":"stellalyra-12-f-12-m-lrc-classical-cassegrain-carbon-truss-telescope-ota","title":"StellaLyra 12\" f\/12 M-LRC Classical Cassegrain Carbon Truss Telescope OTA","description":"\u003cstyle\u003e\n.dcs-cc12t{max-width:1120px;margin:0 auto;color:#243445;font:inherit;line-height:1.7;text-align:left;overflow-wrap:anywhere}\n.dcs-cc12t *{box-sizing:border-box}.dcs-cc12t h2,.dcs-cc12t h3{color:#091725;line-height:1.25;letter-spacing:normal;text-align:left}\n.dcs-cc12t h2{font-size:clamp(25px,3vw,34px);margin:0 0 18px}.dcs-cc12t h3{font-size:23px;margin:0 0 16px}\n.dcs-cc12t p{margin:0 0 16px}.dcs-cc12t figure{margin:0;background:#fff;border:1px solid #e0e5e9;border-radius:12px;overflow:hidden}\n.dcs-cc12t img{display:block;width:100%;height:auto;max-width:600px;margin:auto;object-fit:contain}\n.dcs-cc12t .cc12t-feature,.dcs-cc12t .cc12t-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-cc12t .cc12t-intro{padding:24px;background:#091725;border-top:4px solid #c89524;border-radius:12px}\n.dcs-cc12t .cc12t-intro h2,.dcs-cc12t .cc12t-intro p{color:#fff!important}\n.dcs-cc12t .cc12t-label{font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:700}\n.dcs-cc12t .cc12t-panel{background:#f3f5f7;border-radius:12px;padding:24px;margin:0 0 32px}\n.dcs-cc12t ul{padding-left:22px;margin:0 0 16px}.dcs-cc12t li{margin-bottom:8px}\n.dcs-cc12t table{border-collapse:collapse;width:100%;table-layout:fixed;margin:16px 0 28px;font-size:15px}\n.dcs-cc12t th,.dcs-cc12t td{padding:10px 12px;border-bottom:1px solid #dce2e8;text-align:left;vertical-align:top;white-space:normal}\n.dcs-cc12t th{background:#f3f5f7;color:#091725}.dcs-cc12t th[scope=row]{width:42%}\n.dcs-cc12t details{border-bottom:1px solid #dce2e8;padding:16px 0}.dcs-cc12t summary{cursor:pointer;font-weight:700;color:#091725}.dcs-cc12t details p{margin:12px 0 0}\n.dcs-cc12t .cc12t-note{border-left:3px solid #c89524;padding:14px 18px;background:#fff8e8;margin:28px 0}\n.dcs-cc12t .cc12t-links{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}.dcs-cc12t .cc12t-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-cc12t .cc12t-links a:last-child{background:#f0f3f6}.dcs-cc12t a:focus-visible,.dcs-cc12t summary:focus-visible{outline:3px solid #2874aa;outline-offset:4px}\n@media(max-width:600px){.dcs-cc12t .cc12t-intro,.dcs-cc12t .cc12t-panel{padding:18px}.dcs-cc12t th,.dcs-cc12t td{padding:9px 7px;font-size:14px}}\n.dcs-cc12t figcaption{padding:12px 16px;color:#243445;background:#fff;font-size:14px;line-height:1.5}\u003c\/style\u003e\n\u003csection class=\"dcs-cc12t\"\u003e\n\u003cdiv class=\"cc12t-intro\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"cc12t-label\"\u003eStellaLyra · 12-inch f\/12 M-LRC Classical Cassegrain\u003c\/p\u003e\n\u003ch2\u003eA 304mm Cassegrain for detailed lunar and planetary work.\u003c\/h2\u003e\n\u003cp\u003eThe StellaLyra 12-inch carbon-truss Classical Cassegrain combines a 304mm aperture with a 3648mm focal length at f\/12. It is a substantial optical assembly for a dedicated observing or imaging system, particularly when your subjects benefit from a close view.\u003c\/p\u003e\n\u003cp\u003ePlan the telescope, mount and rear accessories together. Its long focal length and physical size make installation, target acquisition and tracking important parts of the buying decision.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-12-f12-truss-cassegrain-hero.jpg?v=1789825795\" alt=\"StellaLyra 12-inch f\/12 carbon-truss Classical Cassegrain optical tube\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc12t-panel\"\u003e\n\u003ch3\u003eCheck the framing before choosing the camera.\u003c\/h3\u003e\n\u003cp\u003eAt this focal length, even a familiar camera can show a surprisingly small part of the sky. As a calculated example, a 23.5 × 15.7mm sensor covers approximately \u003cstrong\u003e22.1 × 14.8 arcminutes\u003c\/strong\u003e at the native focal length. Covering the whole lunar disc would require more than one frame in that example.\u003c\/p\u003e\n\u003cp\u003eThis is a geometric field-of-view estimate, not a promise of corrected or fully illuminated coverage. Use your actual sensor dimensions and intended targets when planning a setup. For planets or small lunar regions, tight framing can be useful; larger subjects may call for a mosaic or a different optical arrangement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc12t-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-12-f12-truss-cassegrain-rear.jpg?v=1789825807\" alt=\"Rear and side view of StellaLyra 12-inch carbon-truss Classical Cassegrain\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eBuild the installation around the complete load.\u003c\/h3\u003e\n\u003cp\u003eThe published tube weight is \u003cstrong\u003e24kg\u003c\/strong\u003e. Upper and lower Losmandy-style rails provide mounting interfaces.\u003c\/p\u003e\n\u003cp\u003eInclude the camera or diagonal, eyepieces, guiding equipment, adapters and other attached accessories when assessing the working load. Check the mount saddle, counterweight requirements and balance range as part of the same decision.\u003c\/p\u003e\n\u003cp\u003ePlan how the telescope will be supported while being fitted or removed. A permanent installation may suit your routine better than repeated transport, but either approach needs enough space to handle the complete assembly securely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eLeave room for the rear equipment.\u003c\/h3\u003e\n\u003cp\u003eThe focuser, extensions and camera or diagonal project behind the optical assembly. Establish the actual configuration before checking clearance around a tripod, pier or observatory structure.\u003c\/p\u003e\n\u003cp\u003eBalance with the intended equipment attached, then check the pointing range and cable routing. Avoid letting a cable become tight as the telescope moves, and keep connectors accessible for changes made in the dark.\u003c\/p\u003e\n\u003cdiv class=\"cc12t-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-12-f12-truss-cassegrain-optics.jpg?v=1789825829\" alt=\"Front optical assembly and carbon-fibre truss of StellaLyra 12-inch Classical Cassegrain\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eAn open structure needs a practical storage plan.\u003c\/h3\u003e\n\u003cp\u003eCarbon-fibre truss members connect the optical assemblies. The primary and secondary mirrors are quartz.\u003c\/p\u003e\n\u003cp\u003eProtect exposed parts during storage and transport, and assess nearby lighting when deciding whether additional light control is needed. Anything fitted around the truss must remain clear of the optical path and moving equipment.\u003c\/p\u003e\n\u003cp\u003eAllow the telescope time to approach outdoor conditions before evaluating fine detail. Tube construction does not remove the need to check focus, cooling and alignment during a demanding session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc12t-panel\"\u003e\n\u003ch3\u003eUseful eyepiece magnifications.\u003c\/h3\u003e\n\u003cp\u003eDivide the telescope’s focal length by the eyepiece focal length to calculate magnification. Three examples at the native focal length are:\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\u003e122×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003ctd\u003e182×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003ctd\u003e304×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eEyepieces are separate purchases. These figures help plan a set; they do not establish the useful upper power on a particular night. Start lower, centre the subject and increase magnification only while the image remains sharp and informative.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc12t-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-12-f12-truss-cassegrain-focuser.jpg?v=1789825818\" alt=\"Rear focuser assembly of StellaLyra 12-inch f\/12 M-LRC Classical Cassegrain\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eFine focus with the primary mirror held stationary.\u003c\/h3\u003e\n\u003cp\u003eThe 3.25-inch dual-speed linear-bearing Crayford focuser provides coarse and fine adjustment while the primary stays fixed.\u003c\/p\u003e\n\u003cp\u003eSupport a camera or diagonal while attaching it and check each connection before releasing its weight. Keep cable loads off the focuser and assess the complete train at the pointing angles you expect to use.\u003c\/p\u003e\n\u003cp\u003eFor motorised focus, confirm the motor bracket and coupling against the supplied focuser. Focuser diameter alone does not define a safe camera payload, and a saved focus position remains a starting point rather than a guarantee for every session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eSelect extensions around the actual accessory train.\u003c\/h3\u003e\n\u003cp\u003eTwo 25mm and one 50mm extension rings are supplied. Use the combination that positions the focuser appropriately for the diagonal or camera, with useful adjustment remaining.\u003c\/p\u003e\n\u003cp\u003eA visual arrangement and a directly attached camera occupy different optical paths. Establish those connections first rather than automatically installing all three rings. If extra optical elements are introduced, check their spacing requirements separately and record the finished arrangement for repeatable setup.\u003c\/p\u003e\n\u003ch3\u003eMake short tests part of the imaging routine.\u003c\/h3\u003e\n\u003cp\u003ePractise target acquisition at the native focal length before adding a Barlow. An aligned finder and steady tracking help keep a small subject on the sensor while you refine focus and exposure.\u003c\/p\u003e\n\u003cp\u003eInspect short test captures before committing to longer sequences. Choose amplification around the camera’s pixel size and the seeing. Investigate soft images methodically: focus, thermal settling, atmospheric steadiness, tracking and collimation each need a different response.\u003c\/p\u003e\n\u003cp\u003eThe quoted illuminated field is 55mm across. That describes illumination, not a guaranteed flat, sharp field on every sensor. Check actual corner performance and the clear apertures of the complete accessory train when planning a large-camera setup.\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\"\u003eOptical design \/ aperture\u003c\/th\u003e\n\u003ctd\u003eClassical Cassegrain \/ 304mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFocal length \/ ratio\u003c\/th\u003e\n\u003ctd\u003e3648mm \/ f\/12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePublished length without focuser\u003c\/th\u003e\n\u003ctd\u003e841mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eAdditional length of supplied focuser\u003c\/th\u003e\n\u003ctd\u003e133mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePublished tube weight\u003c\/th\u003e\n\u003ctd\u003e24kg\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\u003eDoes the price include a mount or observing accessories?\u003c\/summary\u003e\u003cp\u003eNo. This is an optical tube assembly. Budget for a suitable mount, finder, diagonal and eyepieces or camera, plus the adapters required by the intended setup.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs the open truss a reason to choose it for regular transport?\u003c\/summary\u003e\u003cp\u003eAssess the complete weight, size and installation process against your own circumstances. Plan protection for the exposed structure and support during fitting and removal before deciding how often you will move it.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShould I compare it with the 10-inch model?\u003c\/summary\u003e\u003cp\u003eCompare target framing, total mounting load and the space available for the working setup. The \u003ca href=\"\/products\/stellalyra-10-f-12-m-lrc-classical-cassegrain-carbon-truss-telescope-ota\"\u003e10-inch carbon-truss Classical Cassegrain\u003c\/a\u003e is a smaller alternative to include in that decision.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"cc12t-note\"\u003e\n\u003cstrong\u003eAwaiting stock\u003c\/strong\u003e\u003cp\u003eThis listing currently has no stock available. Contact Dark Clear Skies for a confirmed availability update and dispatch estimate before planning delivery.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc12t-links\"\u003e\n\u003ca href=\"\/pages\/stellalyra\"\u003eCompare the StellaLyra range\u003c\/a\u003e\u003ca href=\"mailto:contact@darkclearskies.co.uk?subject=StellaLyra%2012-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":55665193812344,"sku":null,"price":3299.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-12-f12-truss-cassegrain-hero.jpg?v=1789825795","url":"https:\/\/www.darkclearskies.co.uk\/products\/stellalyra-12-f-12-m-lrc-classical-cassegrain-carbon-truss-telescope-ota","provider":"Dark Clear Skies ","version":"1.0","type":"link"}