{"product_id":"stellalyra-12-f-4-m-lrn-newtonian-reflector-with-3-focuser","title":"StellaLyra 12\" f\/4 M-LRN Newtonian Reflector with 3\" Focuser","description":"\u003cstyle\u003e\n.dcs-m12{max-width:1120px;margin:0 auto;color:#243445;font:inherit;line-height:1.7;text-align:left;overflow-wrap:anywhere}\n.dcs-m12 *{box-sizing:border-box}.dcs-m12 h2,.dcs-m12 h3{color:#091725;line-height:1.25;letter-spacing:normal;text-align:left}\n.dcs-m12 h2{font-size:clamp(25px,3vw,34px);margin:0 0 18px}.dcs-m12 h3{font-size:23px;margin:0 0 16px}\n.dcs-m12 p{margin:0 0 16px}.dcs-m12 figure{margin:0;background:#fff;border:1px solid #e0e5e9;border-radius:12px;overflow:hidden}\n.dcs-m12 img{display:block;width:100%;height:auto;max-width:600px;margin:auto;object-fit:contain}\n.dcs-m12 .m12-feature,.dcs-m12 .m12-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-m12 .m12-intro{padding:24px;background:#091725;border-top:4px solid #c89524;border-radius:12px}\n.dcs-m12 .m12-intro h2,.dcs-m12 .m12-intro p{color:#fff!important}\n.dcs-m12 .m12-label{font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:700}\n.dcs-m12 .m12-panel{background:#f3f5f7;border-radius:12px;padding:24px;margin:0 0 32px}\n.dcs-m12 ul{padding-left:22px;margin:0 0 16px}.dcs-m12 li{margin-bottom:8px}\n.dcs-m12 table{border-collapse:collapse;width:100%;table-layout:fixed;margin:16px 0 28px;font-size:15px}\n.dcs-m12 th,.dcs-m12 td{padding:10px 12px;border-bottom:1px solid #dce2e8;text-align:left;vertical-align:top;white-space:normal}\n.dcs-m12 th{background:#f3f5f7;color:#091725}.dcs-m12 th[scope=row]{width:42%}\n.dcs-m12 details{border-bottom:1px solid #dce2e8;padding:16px 0}.dcs-m12 summary{cursor:pointer;font-weight:700;color:#091725}.dcs-m12 details p{margin:12px 0 0}\n.dcs-m12 .m12-note{border-left:3px solid #c89524;padding:14px 18px;background:#fff8e8;margin:28px 0}\n.dcs-m12 .m12-links{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}.dcs-m12 .m12-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-m12 .m12-links a:last-child{background:#f0f3f6}.dcs-m12 a:focus-visible,.dcs-m12 summary:focus-visible{outline:3px solid #2874aa;outline-offset:4px}\n@media(max-width:600px){.dcs-m12 .m12-intro,.dcs-m12 .m12-panel{padding:18px}.dcs-m12 th,.dcs-m12 td{padding:9px 7px;font-size:14px}}\n\u003c\/style\u003e\n\u003csection class=\"dcs-m12\"\u003e\n\u003cdiv class=\"m12-intro\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"m12-label\"\u003eStellaLyra · 12-inch f\/4 M-LRN Newtonian\u003c\/p\u003e\n\u003ch2\u003eBuild a large-aperture imaging system with purpose.\u003c\/h2\u003e\n\u003cp\u003eThe StellaLyra 12-inch f\/4 combines a 305mm parabolic mirror with a 1220mm focal length and a 3-inch dual-speed linear Crayford focuser. It is a substantial optical tube for a carefully planned deep-sky rig.\u003c\/p\u003e\n\u003cp\u003eChoose it when your imaging goals, mount and observing space are ready for a larger Newtonian, and you want to select the camera and correction system yourself.\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-f4-mlrn-newtonian.jpg?v=1789723183\" alt=\"StellaLyra 12-inch f\/4 M-LRN Newtonian; any supporting mount is not included\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"m12-note\"\u003e\n\u003cstrong\u003eOptical tube package only.\u003c\/strong\u003e\u003cp\u003eMount, tripod or pier, camera and coma corrector are purchased separately. The published tube-package weight is 23kg with rings, rail and finder, before adding imaging equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"m12-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-12-f4-metal-detail-1.jpg?v=1789815487\" alt=\"StellaLyra 12-inch f\/4 Newtonian on an illustrative mount; mount and pier not included\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003cfigcaption style=\"padding:12px;font-size:14px\"\u003eMount, counterweights and pier shown for illustration; not included.\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eMake the mounting plan first.\u003c\/h3\u003e\n\u003cp\u003eAt 1170mm long and 356mm in diameter, this tube needs more than a check against a mount’s headline payload. Consider the complete load, tube length, balance range, wind exposure and clearance throughout the mount’s movement.\u003c\/p\u003e\n\u003cp\u003eAllow for the camera, corrector, filters, guiding equipment and cabling. Check the saddle connection and counterweight requirements with the mount supplier. Plan how the tube will be supported while it is fitted or removed, and arrange assistance where needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"m12-panel\"\u003e\n\u003ch3\u003eThink beyond the space occupied by the telescope.\u003c\/h3\u003e\n\u003cp\u003eMeasure the route from storage to the mount, including doorways, steps and turning space. Leave room to work around the mounted tube, reach adjustment points and manage cables without disturbing the balance.\u003c\/p\u003e\n\u003cp\u003eIf you dismantle everything after every session, consider that whole routine before committing to this size. A fixed observing position can make a larger system more practical, but it still needs suitable storage and protection between uses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"m12-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-12-f4-metal-detail-2.jpg?v=1789815500\" alt=\"Front aperture and secondary mirror assembly of StellaLyra 12-inch f\/4 Newtonian\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eCheck how 1220mm frames your targets.\u003c\/h3\u003e\n\u003cp\u003eWith a given camera sensor, a longer focal length places a smaller area of sky in the frame. This can suit targets that look too small in a shorter setup, while larger subjects may require a mosaic.\u003c\/p\u003e\n\u003cp\u003eUse a field-of-view planner with your actual camera and several intended subjects. Check both the object and the surrounding sky you want to capture. Choose the system because that framing serves your projects, rather than expecting a larger mirror alone to deliver a better finished image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"m12-feature\"\u003e\n\u003cfigure\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-12-f4-metal-detail-3.jpg?v=1789815512\" alt=\"3-inch dual-speed focuser and 8x50 finder on StellaLyra 12-inch f\/4 Newtonian\" width=\"800\" height=\"800\" loading=\"lazy\"\u003e\u003c\/figure\u003e\u003cdiv\u003e\n\u003ch3\u003eFine manual focus, with the camera system chosen separately.\u003c\/h3\u003e\n\u003cp\u003eThe fitted 3-inch linear Crayford focuser provides coarse and fine adjustment. Use short exposures and a repeatable focus measurement to refine focus, then revisit it as conditions change.\u003c\/p\u003e\n\u003cp\u003eSupport the camera while securing it and keep cables from pulling on the assembly. Focuser diameter alone does not establish a payload rating or corrected sensor coverage. Confirm the complete camera, corrector and adapter arrangement before buying, including motor compatibility if you plan autofocus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eA coma corrector belongs in the initial budget.\u003c\/h3\u003e\n\u003cp\u003eA compatible corrector is required for optimum photographic results. Select it for the intended camera sensor and mechanical connections, then follow its specified corrector-to-sensor spacing.\u003c\/p\u003e\n\u003cp\u003eInclude filter equipment in the spacing calculation and check that the assembled system reaches focus. These are separate requirements: moving the focuser does not replace correct spacing. Keep a record of the adapter sequence so it can be rebuilt accurately after removing the camera.\u003c\/p\u003e\n\u003ch3\u003eAllow time for cooling and alignment.\u003c\/h3\u003e\n\u003cp\u003eAn integrated fan assists mirror cooling, and the mirrors have collimation adjustment. Set up early enough for the tube to approach outdoor conditions and check alignment with an appropriate tool after transport.\u003c\/p\u003e\n\u003cp\u003eBefore starting a long sequence, inspect a short star-field exposure at the centre and corners. Work through focus, alignment, spacing, tilt and tracking one factor at a time if the result is uneven. Establishing a repeatable baseline makes later sessions easier to diagnose and more productive.\u003c\/p\u003e\n\u003ch3\u003eIncluded equipment and separate purchases\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eSupplied\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eRequired separately for imaging\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical tube, fitted focuser and cooling fan\u003c\/td\u003e\n\u003ctd\u003eSuitable tracking mount and tripod or pier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube rings and Vixen-style mounting rail\u003c\/td\u003e\n\u003ctd\u003eCamera and compatible coma corrector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8×50 straight-through finder\u003c\/td\u003e\n\u003ctd\u003eAdapters, filters and any guiding equipment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e35mm 2-inch extension and 1.25-inch adapter\u003c\/td\u003e\n\u003ctd\u003ePower, control equipment and collimation tool\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDesign \/ aperture\u003c\/th\u003e\n\u003ctd\u003eParabolic Newtonian \/ 305mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFocal length \/ ratio\u003c\/th\u003e\n\u003ctd\u003e1220mm \/ f\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFocuser\u003c\/th\u003e\n\u003ctd\u003e3-inch dual-speed linear Crayford\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFinder\u003c\/th\u003e\n\u003ctd\u003e8×50 straight-through\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eTube length \/ outside diameter\u003c\/th\u003e\n\u003ctd\u003e1170mm \/ 356mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWeight with rings, rail and finder\u003c\/th\u003e\n\u003ctd\u003e23kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3\u003eBefore choosing the 12-inch\u003c\/h3\u003e\n\u003cdetails\u003e\u003csummary\u003eWill my existing mount carry it?\u003c\/summary\u003e\u003cp\u003eAssess the complete imaging load and the mount’s suitability for a long tube. Send us the exact mount model, camera and accessories so the combination can be reviewed. The optical tube’s weight alone is not enough to establish suitability.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs it suitable for visual observing?\u003c\/summary\u003e\u003cp\u003eIt can be used with appropriate eyepieces and a suitable mount, purchased separately. If visual observing is your main priority, compare the handling and mounting arrangement of the Dobsonian range before deciding.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes the finder provide autoguiding?\u003c\/summary\u003e\u003cp\u003eNo. It is an optical pointing aid. Guiding requires a guide camera and suitable connections or another guiding arrangement matched to the rig.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"m12-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=\"m12-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%20f4%20setup\"\u003eDiscuss your mount and camera\u003c\/a\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"StellaLyra","offers":[{"title":"Default Title","offer_id":55665191911800,"sku":null,"price":799.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/stellalyra-12-f4-mlrn-newtonian.jpg?v=1789723183","url":"https:\/\/www.darkclearskies.co.uk\/products\/stellalyra-12-f-4-m-lrn-newtonian-reflector-with-3-focuser","provider":"Dark Clear Skies ","version":"1.0","type":"link"}