{"product_id":"stellalyra-6-f-12-m-crf-classical-cassegrain-telescope-ota","title":"StellaLyra 6\" f\/12 M-CRF Classical Cassegrain Telescope OTA","description":"\u003cstyle\u003e\n.dcs-cc6{max-width:1120px;margin:0 auto;color:#243445;font:inherit;line-height:1.7;text-align:left;overflow-wrap:anywhere}\n.dcs-cc6 *{box-sizing:border-box}.dcs-cc6 h2,.dcs-cc6 h3{color:#091725;line-height:1.25;letter-spacing:normal;text-align:left}\n.dcs-cc6 h2{font-size:clamp(25px,3vw,34px);margin:0 0 18px}.dcs-cc6 h3{font-size:23px;margin:0 0 16px}\n.dcs-cc6 p{margin:0 0 16px}.dcs-cc6 figure{margin:0;background:#fff;border:1px solid #e0e5e9;border-radius:12px;overflow:hidden}\n.dcs-cc6 img{display:block;width:100%;height:auto;max-width:600px;margin:auto;object-fit:contain}\n.dcs-cc6 .cc6-feature,.dcs-cc6 .cc6-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-cc6 .cc6-intro{padding:24px;background:#091725;border-top:4px solid #c89524;border-radius:12px}\n.dcs-cc6 .cc6-intro h2,.dcs-cc6 .cc6-intro p{color:#fff!important}\n.dcs-cc6 .cc6-label{font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:700}\n.dcs-cc6 .cc6-panel{background:#f3f5f7;border-radius:12px;padding:24px;margin:0 0 32px}\n.dcs-cc6 ul{padding-left:22px;margin:0 0 16px}.dcs-cc6 li{margin-bottom:8px}\n.dcs-cc6 table{border-collapse:collapse;width:100%;table-layout:fixed;margin:16px 0 28px;font-size:15px}\n.dcs-cc6 th,.dcs-cc6 td{padding:10px 12px;border-bottom:1px solid #dce2e8;text-align:left;vertical-align:top;white-space:normal}\n.dcs-cc6 th{background:#f3f5f7;color:#091725}.dcs-cc6 th[scope=row]{width:42%}\n.dcs-cc6 details{border-bottom:1px solid #dce2e8;padding:16px 0}.dcs-cc6 summary{cursor:pointer;font-weight:700;color:#091725}.dcs-cc6 details p{margin:12px 0 0}\n.dcs-cc6 .cc6-note{border-left:3px solid #c89524;padding:14px 18px;background:#fff8e8;margin:28px 0}\n.dcs-cc6 .cc6-links{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}.dcs-cc6 .cc6-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-cc6 .cc6-links a:last-child{background:#f0f3f6}.dcs-cc6 a:focus-visible,.dcs-cc6 summary:focus-visible{outline:3px solid #2874aa;outline-offset:4px}\n@media(max-width:600px){.dcs-cc6 .cc6-intro,.dcs-cc6 .cc6-panel{padding:18px}.dcs-cc6 th,.dcs-cc6 td{padding:9px 7px;font-size:14px}}\n.dcs-cc6 figcaption{padding:12px 16px;color:#243445;background:#fff;font-size:14px;line-height:1.5}\u003c\/style\u003e\n\u003csection class=\"dcs-cc6\"\u003e\n\u003cdiv class=\"cc6-intro\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"cc6-label\"\u003eStellaLyra · 6-inch f\/12 M-CRF Classical Cassegrain\u003c\/p\u003e\n\u003ch2\u003eA closer look at the Moon, planets and double stars.\u003c\/h2\u003e\n\u003cp\u003eThe StellaLyra 6-inch Classical Cassegrain combines a 153mm aperture with an 1836mm focal length at f\/12. Its folded optical layout puts a long focal length into a relatively short tube, making it an appealing choice for observers who enjoy spending time on individual targets.\u003c\/p\u003e\n\u003cp\u003eBuild the observing kit around a steady mount, a suitable diagonal and a small selection of eyepieces. This is an optical tube assembly, with the freedom to choose those accessories for your own observing habits.\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-f12-classical-cassegrain-hero.jpg?v=1789820052\" alt=\"StellaLyra 6-inch f\/12 M-CRF Classical Cassegrain optical tube\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc6-panel\"\u003e\n\u003ch3\u003eChoose it for the detail within the field.\u003c\/h3\u003e\n\u003cp\u003eOn the Moon, explore how changing illumination reveals crater walls, ridges and shadows near the terminator. For planets and double stars, concentrate on accurate focus and moments of steady air rather than increasing magnification as far as possible.\u003c\/p\u003e\n\u003cp\u003eThe long focal length makes moderate and higher powers easy to obtain with ordinary eyepiece focal lengths. It also narrows the field compared with a shorter-focal-length telescope using the same eyepiece. Think about the targets you enjoy: a whole wide star field and a close study of a lunar feature ask for different kinds of framing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc6-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-6-f12-classical-cassegrain-optics.jpg?v=1789820064\" alt=\"Front of StellaLyra 6-inch Classical Cassegrain showing secondary support and internal baffles\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eGive the optical system time to settle.\u003c\/h3\u003e\n\u003cp\u003eThe open front shows the secondary support and internal baffling. Both mirrors are quartz, but the telescope still benefits from time to approach outdoor conditions before critical observing.\u003c\/p\u003e\n\u003cp\u003eJudge sharpness after cooling and careful focus, with the target well centred. If alignment needs attention, use a procedure appropriate to a Classical Cassegrain and confirm the result on a star. Make small, recorded adjustments so that you can identify what improved the image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003ePlan the mount and balance as part of the purchase.\u003c\/h3\u003e\n\u003cp\u003ePublished tube weight is 5.8kg, with a Vixen-style rail underneath. Add your diagonal, eyepiece or camera and any finder when assessing the complete working load.\u003c\/p\u003e\n\u003cp\u003eAt higher magnification, vibration after touching the focuser is particularly noticeable. Choose support that settles promptly, check the saddle fits securely and balance with your actual accessories attached. Equipment behind the tube changes the balance point, so confirm there is enough adjustment on the rail and clearance around the mount.\u003c\/p\u003e\n\u003cdiv class=\"cc6-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-6-f12-classical-cassegrain-focuser.jpg?v=1789820074\" alt=\"Dual-speed Crayford focuser and finder base on StellaLyra 6-inch Classical Cassegrain\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eFine focus with the primary mirror held fixed.\u003c\/h3\u003e\n\u003cp\u003eThe rotatable 2-inch dual-speed Crayford focuser moves the accessory position while the primary stays fixed. Coarse and fine controls help you approach focus and then refine it.\u003c\/p\u003e\n\u003cp\u003eSupport a heavy diagonal or camera while securing the connection. Check that cables do not pull on the focuser as the telescope moves, and allow any vibration to settle before judging the final adjustment. A motorised setup needs a compatible bracket and coupling; establish those details before choosing a motor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc6-panel\"\u003e\n\u003ch3\u003eA useful starting point for eyepiece choice.\u003c\/h3\u003e\n\u003cp\u003eDivide the telescope’s focal length by the eyepiece focal length to calculate magnification. For this telescope:\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\u003e25mm\u003c\/td\u003e\n\u003ctd\u003e73×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e15mm\u003c\/td\u003e\n\u003ctd\u003e122×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003ctd\u003e184×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThese are calculated examples; eyepieces are purchased separately. Begin at lower power to find and centre a target, then increase magnification while the view remains sharp and useful. A higher number does not ensure more visible detail when the atmosphere is unsteady.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cc6-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-6-f12-classical-cassegrain-extensions.jpg?v=1789820085\" alt=\"Focuser extension rings supplied with StellaLyra 6-inch Classical Cassegrain\" width=\"600\" height=\"600\" loading=\"lazy\"\u003e\u003cfigcaption\u003eExtension rings allow the focuser position to be configured for the accessory train.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eThree extension rings, chosen to suit your setup.\u003c\/h3\u003e\n\u003cp\u003eTwo 25mm rings and one 50mm ring are supplied. They let you position the focuser to accommodate different accessory arrangements.\u003c\/p\u003e\n\u003cp\u003eA diagonal and eyepiece occupy a different optical path from a camera attached directly at the rear. Select the arrangement you intend to use, then fit the extension combination needed to reach focus with adjustment remaining. Installing every ring is not the starting point for every configuration.\u003c\/p\u003e\n\u003cp\u003eKeep a note of the combination that works for each setup. That makes a change between visual observing and imaging easier to repeat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eMoving from visual observing to lunar or planetary imaging.\u003c\/h3\u003e\n\u003cp\u003eStart with the camera at the native focal length and practise acquiring the target on the sensor. An accurately aligned finder and steady tracking make a small field much easier to work with.\u003c\/p\u003e\n\u003cp\u003eUse short test captures to refine focus and exposure before recording a longer sequence. Choose any Barlow around the camera’s pixel size and the seeing; extra amplification increases the demands on tracking and focus and is not automatically an improvement.\u003c\/p\u003e\n\u003cp\u003eFor long-exposure deep-sky work, consider the narrow framing, f\/12 focal ratio and guiding requirements together. Compare the complete setup with other imaging designs if wide nebulae or a first deep-sky system are your main objective.\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\u003eClassical Cassegrain optical tube and focuser\u003c\/td\u003e\n\u003ctd\u003eCompatible mount and stable tripod or pier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVixen-style rail and finder base\u003c\/td\u003e\n\u003ctd\u003eFinder or pointing aid\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 and its required connection adapters\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 \/ 153mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFocal length \/ ratio\u003c\/th\u003e\n\u003ctd\u003e1836mm \/ 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\"\u003eFocuser\u003c\/th\u003e\n\u003ctd\u003e2-inch dual-speed rotatable Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePublished tube length \/ diameter\u003c\/th\u003e\n\u003ctd\u003e437mm \/ 193mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePublished tube weight\u003c\/th\u003e\n\u003ctd\u003e5.8kg\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 it arrive as a complete observing package?\u003c\/summary\u003e\u003cp\u003eNo. The telescope needs a separately chosen mount, diagonal and eyepieces for a visual setup. The fitted finder base is an attachment point; a finderscope is not included.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDo I need all three extension rings?\u003c\/summary\u003e\u003cp\u003eThat depends on the actual diagonal, eyepiece or camera arrangement. Use the combination that places focus within the focuser’s travel. If you are unsure, send Dark Clear Skies the exact accessory models before ordering.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow should I compare it with the smaller Mini?\u003c\/summary\u003e\u003cp\u003eCompare the complete kit’s size, mounting load and intended targets. The \u003ca href=\"\/products\/stellalyra-4-5-f-12-cf-mini-classical-cassegrain-carbon-fibre-telescope-ota\"\u003e4.5-inch Mini Classical Cassegrain\u003c\/a\u003e offers a smaller alternative. Include the mount and accessories in your storage and transport plan for either model.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"cc6-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=\"cc6-links\"\u003e\n\u003ca href=\"\/pages\/stellalyra\"\u003eCompare the StellaLyra range\u003c\/a\u003e\u003ca href=\"mailto:contact@darkclearskies.co.uk?subject=StellaLyra%206-inch%20Classical%20Cassegrain\"\u003ePlan your observing setup\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n","brand":"StellaLyra","offers":[{"title":"Default Title","offer_id":55665193648504,"sku":null,"price":429.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-6-f12-classical-cassegrain-hero.jpg?v=1789820052","url":"https:\/\/www.darkclearskies.co.uk\/products\/stellalyra-6-f-12-m-crf-classical-cassegrain-telescope-ota","provider":"Dark Clear Skies ","version":"1.0","type":"link"}