{"product_id":"takahashi-starbase-or-6mm-orthoscopic-eyepiece","title":"Takahashi Starbase OR-6mm Orthoscopic Eyepiece","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Starbase OR-6mm is a 6mm orthoscopic eyepiece from Takahashi's Starbase accessory line, and the shortest, highest-power focal length in the series. It uses the same 4-elements-in-2-groups design as the rest of the OR range, with a 43° apparent field of view, 4mm of eye relief, and a 1.25” (31.7mm) barrel with fully multi-coated optics.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want the highest practical magnification in a Starbase orthoscopic eyepiece — for planetary detail, close double stars, and lunar close-ups on nights when the atmosphere holds steady.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrthoscopic 4-element, 2-group design:\u003c\/strong\u003e low distortion at the center of the field, where high-power detail is formed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e43° apparent field of view:\u003c\/strong\u003e slightly narrower than the rest of the Starbase OR line, typical at this short a focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4mm eye relief:\u003c\/strong\u003e tight — workable bare-eyed, demanding for eyeglass wearers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated optics:\u003c\/strong\u003e keeps contrast up despite the high element count for the size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25” (31.7mm) barrel:\u003c\/strong\u003e the Takahashi standard, fits existing focusers and diagonals.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eShort-focal-length orthoscopic eyepieces put the most demand on the four-element, two-group design's center-field correction, since that is where all the magnification and detail is concentrated. The OR-6mm holds the same design language as the rest of the Starbase orthoscopic line at a scale built specifically for high power, which is also why the eye relief tightens up and the apparent field narrows slightly compared to its longer siblings.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eOn a Takahashi TSA-120 (900mm, f\/7.5) the OR-6mm gives about 150x, useful for planetary detail and close double stars on a night of good seeing. On a Takahashi FS-60CB (355mm, f\/5.9) the same eyepiece yields roughly 59x, a solid high-power option for a small travel refractor. Divide any Takahashi tube's focal length by 6mm for the magnification on your own setup — and remember that atmospheric seeing, not the eyepiece, usually sets the practical ceiling on a given night.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 1.25” (31.7mm) barrel fits any Takahashi focuser, star diagonal, or 2″-to-1.25” adapter already in the current lineup, so it slots into an existing eyepiece case without extra hardware.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot parfocal:\u003c\/strong\u003e Takahashi lists this eyepiece as non-parfocal, so refocusing is needed when you switch to it from another eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e4mm eye relief is tight:\u003c\/strong\u003e comfortable without glasses; eyeglass wearers may prefer a longer-eye-relief eyepiece for this magnification range, or observing without glasses and adjusting focus to compensate.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads directly into a standard 1.25” focuser or diagonal. The tight eye relief takes a bit more care in positioning your eye than a longer-eye-relief eyepiece, but no tools or adjustment are involved.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigh-power visual observing — planetary detail, lunar close-ups, and close double stars, on nights with steady seeing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it compare to the OR-9mm?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame 4-element orthoscopic design; the OR-6mm's shorter focal length gives higher magnification, a narrower field, and tighter eye relief.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat telescopes does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAny Takahashi refractor or reflector with a standard 1.25” focuser or diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 6mm orthoscopic eyepiece with a 43° field and a 1.25” barrel — the highest-power option in the Starbase orthoscopic line, built for planetary and lunar detail. If you're building a full eyepiece set and want help matching focal lengths to your telescope, send us your setup and we'll work it out with you.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047075958895,"sku":"TAK-SBP08020","price":91.52,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sbp08020_3.jpg?v=1786912825","url":"https:\/\/ontariotelescope.com\/products\/takahashi-starbase-or-6mm-orthoscopic-eyepiece","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}