{"product_id":"stellalyra-10-f-8-m-lrs-ritchey-chretien-telescope-ota","title":"StellaLyra 10\" f\/8 M-LRS Ritchey-Chrétien Telescope OTA","description":"\u003cstyle\u003e\n.dcs-rc10m{max-width:1120px;margin:0 auto;color:#243445;font:inherit;line-height:1.7;text-align:left;overflow-wrap:anywhere}\n.dcs-rc10m *{box-sizing:border-box}.dcs-rc10m h2,.dcs-rc10m h3{color:#091725;line-height:1.25;letter-spacing:normal;text-align:left}\n.dcs-rc10m h2{font-size:clamp(25px,3vw,34px);margin:0 0 18px}.dcs-rc10m h3{font-size:23px;margin:0 0 16px}\n.dcs-rc10m p{margin:0 0 16px}.dcs-rc10m figure{margin:0;background:#fff;border:1px solid #e0e5e9;border-radius:12px;overflow:hidden}\n.dcs-rc10m img{display:block;width:100%;height:auto;max-width:600px;margin:auto;object-fit:contain}\n.dcs-rc10m .rc10m-feature,.dcs-rc10m .rc10m-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-rc10m .rc10m-intro{padding:24px;background:#091725;border-top:4px solid #c89524;border-radius:12px}\n.dcs-rc10m .rc10m-intro h2,.dcs-rc10m .rc10m-intro p{color:#fff!important}\n.dcs-rc10m .rc10m-label{font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:700}\n.dcs-rc10m .rc10m-panel{background:#f3f5f7;border-radius:12px;padding:24px;margin:0 0 32px}\n.dcs-rc10m ul{padding-left:22px;margin:0 0 16px}.dcs-rc10m li{margin-bottom:8px}\n.dcs-rc10m table{border-collapse:collapse;width:100%;table-layout:fixed;margin:16px 0 28px;font-size:15px}\n.dcs-rc10m th,.dcs-rc10m td{padding:10px 12px;border-bottom:1px solid #dce2e8;text-align:left;vertical-align:top;white-space:normal}\n.dcs-rc10m th{background:#f3f5f7;color:#091725}.dcs-rc10m th[scope=row]{width:42%}\n.dcs-rc10m details{border-bottom:1px solid #dce2e8;padding:16px 0}.dcs-rc10m summary{cursor:pointer;font-weight:700;color:#091725}.dcs-rc10m details p{margin:12px 0 0}\n.dcs-rc10m .rc10m-note{border-left:3px solid #c89524;padding:14px 18px;background:#fff8e8;margin:28px 0}\n.dcs-rc10m .rc10m-links{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}.dcs-rc10m .rc10m-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-rc10m .rc10m-links a:last-child{background:#f0f3f6}.dcs-rc10m a:focus-visible,.dcs-rc10m summary:focus-visible{outline:3px solid #2874aa;outline-offset:4px}\n@media(max-width:600px){.dcs-rc10m .rc10m-intro,.dcs-rc10m .rc10m-panel{padding:18px}.dcs-rc10m th,.dcs-rc10m td{padding:9px 7px;font-size:14px}}\n.dcs-rc10m figcaption{padding:12px 16px;color:#243445;background:#fff;font-size:14px;line-height:1.5}\u003c\/style\u003e\n\u003csection class=\"dcs-rc10m\"\u003e\n\u003cdiv class=\"rc10m-intro\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"rc10m-label\"\u003eStellaLyra · 10-inch f\/8 M-LRS Ritchey–Chrétien\u003c\/p\u003e\n\u003ch2\u003eFrame smaller deep-sky targets at 2000mm.\u003c\/h2\u003e\n\u003cp\u003eThe StellaLyra 10-inch M-LRS combines a 250mm aperture with a 2000mm, f\/8 optical system in a solid metal tube. It is a purposeful choice for an experienced imager building a setup around smaller galaxies, compact nebulae and tighter compositions.\u003c\/p\u003e\n\u003cp\u003eChoose it when your mount, camera and observing conditions can support the longer focal length. A complete, well-matched imaging system is the route to useful extra detail.\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-f8-metal-rc-hero.jpg?v=1789817776\" alt=\"StellaLyra 10-inch f\/8 M-LRS metal-tube RC; pictured mount is not included\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003cfigcaption\u003eOptical tube assembly only. The pictured mount is not included.\u003c\/figcaption\u003e\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rc10m-panel\"\u003e\n\u003ch3\u003eSee what the focal length means for your camera.\u003c\/h3\u003e\n\u003cp\u003eA longer focal length gives the same target more room on the sensor and narrows the surrounding field. That is useful for some projects, but it can turn a large nebula into a mosaic.\u003c\/p\u003e\n\u003cp\u003eAs a planning example, a 23.5 × 15.7mm sensor at the native focal length covers approximately \u003cstrong\u003e40 × 27 arcminutes\u003c\/strong\u003e. This is a geometric field-of-view estimate, not a claim that every part of that sensor will be fully corrected or illuminated.\u003c\/p\u003e\n\u003cp\u003eCheck your actual camera dimensions and target framing before buying. Pixel size and local seeing also matter: a very fine image scale makes tracking and focus errors easier to see without necessarily recording more resolved detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rc10m-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-10-f8-metal-rc-front.jpg?v=1789817800\" alt=\"Front of StellaLyra 10-inch metal-tube Ritchey-Chretien showing secondary support and internal baffles\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eAn RC optical system for a planned imaging train.\u003c\/h3\u003e\n\u003cp\u003eThe Ritchey–Chrétien design corrects coma, while the primary stays fixed during focusing. This provides a useful starting point for a dedicated camera setup.\u003c\/p\u003e\n\u003cp\u003eComa correction does not guarantee a flat image plane across every sensor. Select any flattener or reducer for the RC design, the intended camera and the required connections. A Newtonian coma corrector is not a substitute simply because its barrel fits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eChoose the mount for the whole working assembly.\u003c\/h3\u003e\n\u003cp\u003eThe published tube weight is \u003cstrong\u003e15.9kg\u003c\/strong\u003e. Add the camera, filters, guiding equipment, correction optics and attached accessories before assessing the load. Check counterweight needs and the complete system’s balance as well as the mount’s quoted payload.\u003c\/p\u003e\n\u003cp\u003eAt this focal length, accurate tracking matters throughout an exposure. Consider guiding arrangements, the stiffness of each connection and your likely exposure lengths when deciding whether an existing mount is suitable. Plan how to support the tube securely during fitting and removal.\u003c\/p\u003e\n\u003cdiv class=\"rc10m-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-10-f8-metal-rc-rear.jpg?v=1789817787\" alt=\"Rear and side of StellaLyra 10-inch metal-tube RC with focuser and cooling vents; mount not included\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003cfigcaption\u003eRear and side view. Mount shown for illustration and sold separately.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eBuild a repeatable setup around the solid tube.\u003c\/h3\u003e\n\u003cp\u003eUpper and lower Losmandy-style rails provide mounting interfaces, and the telescope includes a cooling-fan system.\u003c\/p\u003e\n\u003cp\u003eCheck saddle engagement before releasing the tube. Fit the complete imaging train before balancing, and make sure cables remain free throughout the intended pointing range. Leave clearance for the rear equipment near a tripod or pier.\u003c\/p\u003e\n\u003cp\u003eAllow cooling time before judging star shape. Use the interval for balance, cable and guiding checks, then take short test exposures before beginning a long sequence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rc10m-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-10-f8-metal-rc-focuser.jpg?v=1789817813\" alt=\"Dual-speed rear focuser and cooling fans on StellaLyra 10-inch f\/8 M-LRS RC\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eFine focus and a secure camera connection.\u003c\/h3\u003e\n\u003cp\u003eThe rotatable 3.25-inch dual-speed linear-bearing Crayford focuser provides coarse and fine manual control.\u003c\/p\u003e\n\u003cp\u003eSupport the camera while attaching it, secure every joint and check the train at different pointing angles. Keep cable weight off the focuser. If you intend to automate focus, establish the correct motor bracket and coupling for the supplied focuser before ordering.\u003c\/p\u003e\n\u003cp\u003eRecord a useful starting position, but recheck focus as conditions change. The apparent size of the focuser alone does not specify a safe camera payload or corrected sensor coverage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rc10m-panel\"\u003e\n\u003ch3\u003eGet extension and sensor spacing right.\u003c\/h3\u003e\n\u003cp\u003eThe supplied rings let you position the focuser to suit the assembled camera train. Use the combination that brings the system to focus with adjustment remaining, rather than fitting every ring automatically.\u003c\/p\u003e\n\u003cp\u003eA reducer or flattener introduces a separate requirement: its specified distance to the camera sensor. Count the sensor recess, adapters and filter equipment in that measurement. Establish those optical distances first, then confirm that the complete arrangement reaches focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eCheck the field before committing to a night’s imaging.\u003c\/h3\u003e\n\u003cp\u003eInspect short exposures at the centre and corners. If star shapes differ across the image, investigate focus, tracking, camera tilt, spacing and collimation methodically.\u003c\/p\u003e\n\u003cp\u003eUse an alignment procedure appropriate to an RC, with a star-field check as the final assessment. Change one factor at a time and keep notes. This makes it easier to identify the cause of a problem and return to a known arrangement after transport or an accessory change.\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\u003eMetal-tube RC optical assembly and focuser\u003c\/td\u003e\n\u003ctd\u003eTracking mount and tripod or pier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpper and lower rails; cooling fans\u003c\/td\u003e\n\u003ctd\u003eCamera, filters, guiding and power equipment\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 adapters and any RC-compatible correction optics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2-inch holder and 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\u003eFinder base; primary and secondary dust covers\u003c\/td\u003e\n\u003ctd\u003eFinder and transport protection if needed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eDimensions for installation\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePublished tube length\u003c\/th\u003e\n\u003ctd\u003e610mm, excluding the focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePublished outside diameter\u003c\/th\u003e\n\u003ctd\u003e297mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eAllow additional room for the rear imaging train, cables and access to the controls. Tube dimensions alone do not establish the clearance needed for a complete mounted system.\u003c\/p\u003e\n\u003ch3\u003eBefore ordering\u003c\/h3\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this ready to take photographs on its own?\u003c\/summary\u003e\u003cp\u003eNo. It is an optical tube assembly. Budget for the mount, camera, adapters, guiding and any correction optics as a complete system. The mount in the photographs is not supplied.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWill a larger camera need a flattener?\u003c\/summary\u003e\u003cp\u003eAssess the specific sensor and your expectations for the image corners. RC optics correct coma, but field curvature and mechanical alignment still matter. Confirm the proposed combination before buying correction optics or adapters.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I also use it visually?\u003c\/summary\u003e\u003cp\u003eWith suitable separately purchased accessories and a mount, visual observing is possible. Check the diagonal, eyepiece and extension arrangement reaches focus. Choose this telescope principally around the imaging work you intend to do.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"rc10m-note\"\u003e\n\u003cstrong\u003eAwaiting stock\u003c\/strong\u003e\u003cp\u003eThis model currently has no supplier stock allocated in our listing. Contact Dark Clear Skies for a confirmed availability update before planning delivery; no dispatch date is promised here.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rc10m-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%20metal-tube%20RC\"\u003eDiscuss your imaging system\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n","brand":"StellaLyra","offers":[{"title":"Default Title","offer_id":55665192862072,"sku":null,"price":2199.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-10-f8-metal-rc-hero.jpg?v=1789817776","url":"https:\/\/www.darkclearskies.co.uk\/products\/stellalyra-10-f-8-m-lrs-ritchey-chretien-telescope-ota","provider":"Dark Clear Skies ","version":"1.0","type":"link"}