{"product_id":"takahashi-starbase-or-9mm-orthoscopic-eyepiece","title":"Takahashi Starbase OR-9mm Orthoscopic Eyepiece","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Starbase OR-9mm is a 9mm orthoscopic eyepiece from Takahashi's Starbase accessory line, built on the series' 4-elements-in-2-groups design for low center-field distortion. It has a 45° apparent field of view, 7mm of eye relief, weighs 52g, and Takahashi lists an overall body size of 33mm x 35mm (diameter x length) for this model — one of the shorter, higher-power focal lengths in the Starbase orthoscopic range.\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 a high-power eyepiece for planetary detail, lunar close-ups, or splitting tighter double stars, on nights when the seeing supports it.\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 planetary detail lives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e45° apparent field of view:\u003c\/strong\u003e steady framing even at high power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7mm eye relief:\u003c\/strong\u003e workable without glasses; tighter for eyeglass wearers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e52g weight:\u003c\/strong\u003e negligible load on the focuser.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAt short focal lengths, the correction an orthoscopic design holds at the center of the field matters more, not less — that's exactly where high-power planetary and lunar detail is formed. The 9mm OR keeps the same four-element, two-group layout as the rest of the Starbase orthoscopic series, scaled down for the shorter focal length and correspondingly higher magnification.\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-9mm gives about 100x, a solid all-around planetary magnification. On a Takahashi FS-60CB (355mm, f\/5.9) the same eyepiece yields roughly 39x, useful for brighter deep-sky objects at moderate power on a smaller travel scope. Divide any Takahashi tube's focal length by 9mm for the magnification on your own setup.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot parfocal with the rest of the range:\u003c\/strong\u003e expect to refocus when you swap eyepieces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e7mm eye relief is tighter than the longer Starbase focal lengths:\u003c\/strong\u003e workable bare-eyed; eyeglass wearers may find it easier to observe without glasses and adjust focus for their own correction instead.\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.\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 tighter double stars.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it compare to the OR-6mm?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame 4-element orthoscopic design and barrel convention; the OR-9mm's slightly longer focal length gives a somewhat lower magnification and more forgiving 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 9mm orthoscopic eyepiece with a 45° field, 7mm eye relief, and a 52g weight — a high-power option 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":54047075598447,"sku":"TAK-SBP08030","price":80.08,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sbp08030_3.jpg?v=1786912792","url":"https:\/\/ontariotelescope.com\/products\/takahashi-starbase-or-9mm-orthoscopic-eyepiece","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}