{"product_id":"stellalyra-6-f-9-m-crf-ritchey-chretien-telescope-ota","title":"StellaLyra 6\" f\/9 M-CRF Ritchey-Chrétien Telescope OTA","description":"\u003cstyle\u003e\n.dcs-rc6{max-width:1120px;margin:0 auto;color:#243445;font:inherit;line-height:1.7;text-align:left;overflow-wrap:anywhere}\n.dcs-rc6 *{box-sizing:border-box}.dcs-rc6 h2,.dcs-rc6 h3{color:#091725;line-height:1.25;letter-spacing:normal;text-align:left}\n.dcs-rc6 h2{font-size:clamp(25px,3vw,34px);margin:0 0 18px}.dcs-rc6 h3{font-size:23px;margin:0 0 16px}\n.dcs-rc6 p{margin:0 0 16px}.dcs-rc6 figure{margin:0;background:#fff;border:1px solid #e0e5e9;border-radius:12px;overflow:hidden}\n.dcs-rc6 img{display:block;width:100%;height:auto;max-width:600px;margin:auto;object-fit:contain}\n.dcs-rc6 .rc6-feature,.dcs-rc6 .rc6-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-rc6 .rc6-intro{padding:24px;background:#091725;border-top:4px solid #c89524;border-radius:12px}\n.dcs-rc6 .rc6-intro h2,.dcs-rc6 .rc6-intro p{color:#fff!important}\n.dcs-rc6 .rc6-label{font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:700}\n.dcs-rc6 .rc6-panel{background:#f3f5f7;border-radius:12px;padding:24px;margin:0 0 32px}\n.dcs-rc6 ul{padding-left:22px;margin:0 0 16px}.dcs-rc6 li{margin-bottom:8px}\n.dcs-rc6 table{border-collapse:collapse;width:100%;table-layout:fixed;margin:16px 0 28px;font-size:15px}\n.dcs-rc6 th,.dcs-rc6 td{padding:10px 12px;border-bottom:1px solid #dce2e8;text-align:left;vertical-align:top;white-space:normal}\n.dcs-rc6 th{background:#f3f5f7;color:#091725}.dcs-rc6 th[scope=row]{width:42%}\n.dcs-rc6 details{border-bottom:1px solid #dce2e8;padding:16px 0}.dcs-rc6 summary{cursor:pointer;font-weight:700;color:#091725}.dcs-rc6 details p{margin:12px 0 0}\n.dcs-rc6 .rc6-note{border-left:3px solid #c89524;padding:14px 18px;background:#fff8e8;margin:28px 0}\n.dcs-rc6 .rc6-links{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}.dcs-rc6 .rc6-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-rc6 .rc6-links a:last-child{background:#f0f3f6}.dcs-rc6 a:focus-visible,.dcs-rc6 summary:focus-visible{outline:3px solid #2874aa;outline-offset:4px}\n@media(max-width:600px){.dcs-rc6 .rc6-intro,.dcs-rc6 .rc6-panel{padding:18px}.dcs-rc6 th,.dcs-rc6 td{padding:9px 7px;font-size:14px}}\n\u003c\/style\u003e\n\u003csection class=\"dcs-rc6\"\u003e\n\u003cdiv class=\"rc6-intro\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"rc6-label\"\u003eStellaLyra · 6-inch f\/9 M-CRF Ritchey–Chrétien\u003c\/p\u003e\n\u003ch2\u003eA closer view of smaller deep-sky targets.\u003c\/h2\u003e\n\u003cp\u003eThe StellaLyra 6-inch RC combines a 153mm aperture and 1370mm focal length in a short metal tube. Its two hyperbolic mirrors form a Ritchey–Chrétien optical system, with a fixed primary mirror and a separate rear focuser.\u003c\/p\u003e\n\u003cp\u003eChoose it when you want a tighter camera view of smaller targets and are ready to build a tracking, focusing and alignment routine around a longer focal length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-6-f9-mcrf-rc-ota.jpg?v=1789723211\" alt=\"StellaLyra 6-inch f\/9 M-CRF metal Ritchey-Chretien optical tube\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rc6-panel\"\u003e\n\u003ch3\u003eChoose it for framing, not simply more magnification.\u003c\/h3\u003e\n\u003cp\u003eWith the same sensor, a longer focal length places a smaller area of sky in the image. That can help when a galaxy or compact nebula looks too small in your current wide-field setup.\u003c\/p\u003e\n\u003cp\u003eCheck your favourite targets in a field-of-view planner using your actual camera. Some will fit well; larger subjects may need a mosaic. Consider your camera’s pixel size and local seeing alongside the framing, because a closer image scale also makes tracking and focus errors more noticeable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rc6-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-6-f9-metal-rc-detail-2.jpg?v=1789815720\" alt=\"Front aperture, secondary mirror and internal baffles of StellaLyra 6-inch RC\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eAn RC optical system, with internal baffling.\u003c\/h3\u003e\n\u003cp\u003eThe design corrects coma without the Newtonian-style coma corrector used by the f\/4 and f\/5 reflector range. Internal baffles help control stray light.\u003c\/p\u003e\n\u003cp\u003eThat does not guarantee a perfectly flat, corrected image across every sensor. Assess the camera and any RC-compatible field-correction optics together. A corrector bought for a Newtonian should not be assumed suitable simply because its barrel fits the focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rc6-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-6-f9-metal-rc-detail-1.jpg?v=1789815708\" alt=\"Rear Crayford focuser on StellaLyra 6-inch f\/9 metal Ritchey-Chretien\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eFocus at the rear while the primary stays fixed.\u003c\/h3\u003e\n\u003cp\u003eThe 2-inch dual-speed rotatable Crayford focuser moves the camera or eyepiece to focus. The primary mirror remains fixed, avoiding the focusing movement of the primary used in some other telescope designs.\u003c\/p\u003e\n\u003cp\u003eUse coarse adjustment to approach focus, then refine it with the fine control and short test exposures. Support your camera while attaching it and check that the complete assembly remains secure as the telescope points higher in the sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eThree extension rings help position your imaging train.\u003c\/h3\u003e\n\u003cp\u003eTwo 25mm rings and one 50mm ring are supplied. Select the combination needed for your particular camera arrangement; do not assume every ring must be installed.\u003c\/p\u003e\n\u003cp\u003eThese rings provide mechanical extension. If you add a reducer or flattener, its required distance to the camera sensor is a separate measurement. Account for the camera’s sensor recess, filter hardware and adapters, then check that the complete setup can reach focus with useful adjustment remaining.\u003c\/p\u003e\n\u003cdiv class=\"rc6-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-6-f9-metal-rc-detail-3.jpg?v=1789815734\" alt=\"Vixen-style mounting rail on StellaLyra 6-inch Ritchey-Chretien tube\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eShort tube, with rear-mounted equipment to balance.\u003c\/h3\u003e\n\u003cp\u003eThe published tube length is 391mm and diameter is 193mm including end rings. Weight with the supplied accessories is 5.61kg, and a Vixen-style rail provides the mounting connection.\u003c\/p\u003e\n\u003cp\u003eThe camera and extensions add length and weight behind the tube. Balance with the actual imaging train fitted, check saddle travel and verify clearance around the mount. Include guiding equipment, filters and cabling when assessing the complete load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"rc6-panel\"\u003e\n\u003ch3\u003ePlan tracking and alignment as carefully as the optics.\u003c\/h3\u003e\n\u003cp\u003eA compact tube does not make long-focal-length imaging insensitive to mount performance. Choose the tracking and guiding arrangement for the image scale and exposure times you intend to use.\u003c\/p\u003e\n\u003cp\u003eCheck collimation with a method appropriate to an RC, then inspect a star field before starting a long sequence. If alignment is already good, avoid making unnecessary adjustments. Keep notes and change one factor at a time when investigating uneven stars, so focus, tilt and alignment are not confused with one another.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat is supplied?\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eIncluded\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\u003eRC optical tube with fitted focuser and Vixen-style rail\u003c\/td\u003e\n\u003ctd\u003eTracking mount and tripod or pier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2-inch to 1.25-inch adapter\u003c\/td\u003e\n\u003ctd\u003eCamera and suitable camera connections\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTwo 25mm and one 50mm extension rings\u003c\/td\u003e\n\u003ctd\u003eAny reducer or field-correction optics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVixen\/Synta-style finder base\u003c\/td\u003e\n\u003ctd\u003eFinder, guiding equipment and power as required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eA finder is not included. Eyepieces and any diagonal for visual use are also separate purchases.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eOptical design\u003c\/th\u003e\n\u003ctd\u003eRitchey–Chrétien, hyperbolic primary and secondary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eAperture \/ focal length\u003c\/th\u003e\n\u003ctd\u003e153mm \/ 1370mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFocal ratio\u003c\/th\u003e\n\u003ctd\u003eNominal f\/9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFocusing\u003c\/th\u003e\n\u003ctd\u003eFixed primary; 2-inch dual-speed rotatable Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eTube length \/ outside diameter\u003c\/th\u003e\n\u003ctd\u003e391mm \/ 193mm including end rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWeight with included accessories\u003c\/th\u003e\n\u003ctd\u003e5.61kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eBefore choosing the 6-inch RC\u003c\/h3\u003e\n\u003cdetails\u003e\u003csummary\u003eIs a reducer included?\u003c\/summary\u003e\u003cp\u003eNo. Select an RC-compatible reducer separately if it suits your camera and target framing. Check the specified spacing and supported sensor size before assembling the imaging train.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use my existing Newtonian coma corrector?\u003c\/summary\u003e\u003cp\u003eDo not assume compatibility. The RC has a different optical design and does not require a Newtonian coma corrector. Tell us the exact accessory and camera models so the proposed combination can be checked.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I observe through an eyepiece?\u003c\/summary\u003e\u003cp\u003eYes, with the appropriate eyepiece and focus arrangement. If visual observing is your main priority, compare the complete mounting and accessory requirements with the Dobsonian and Classical Cassegrain ranges before deciding.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"rc6-note\"\u003e\n\u003cstrong\u003eSupplier-stock availability\u003c\/strong\u003e\u003cp\u003eAvailability reflects supplier stock and can 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=\"rc6-links\"\u003e\n\u003ca href=\"\/pages\/stellalyra\"\u003eExplore StellaLyra telescope types\u003c\/a\u003e\u003ca href=\"mailto:contact@darkclearskies.co.uk?subject=StellaLyra%206-inch%20RC%20setup\"\u003eCheck your camera setup\u003c\/a\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"StellaLyra","offers":[{"title":"Default Title","offer_id":55665192567160,"sku":null,"price":459.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-6-f9-mcrf-rc-ota.jpg?v=1789723211","url":"https:\/\/www.darkclearskies.co.uk\/products\/stellalyra-6-f-9-m-crf-ritchey-chretien-telescope-ota","provider":"Dark Clear Skies ","version":"1.0","type":"link"}