{"product_id":"takahashi-toe-10mm-eyepiece","title":"Takahashi TOE 10mm Eyepiece","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOE 10 mm sits at the long end of Takahashi's TOE planetary eyepiece line. It gives a 58° apparent field with 15 mm of eye relief, from six elements arranged in four groups — more glass than a classic orthoscopic, used to widen the field and push the eye point further back without giving up the contrast that makes an ortho worth using on planets.\u003c\/p\u003e\u003cp\u003eAt 10 mm it is the eyepiece you reach for when you want detail without pushing to the seeing limit: 35x on an FS-60CB, 76x on an FC-76D, 110x on a Mewlon 210.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe planets, the Moon and double stars and want an eyepiece whose contrast keeps up with a good apochromat. The 58° field is deliberately moderate — wide enough that the target does not drift out of view quickly on an undriven mount, narrow enough that the design can stay simple and well corrected.\u003c\/p\u003e\u003cp\u003eThe 15 mm eye relief is the practical difference from a traditional orthoscopic. Short-focal-length orthos put your eye almost against the lens; 15 mm gives room to observe comfortably, including over glasses in many cases.\u003c\/p\u003e\u003cp\u003eIt is a visual eyepiece. Imaging trains connect a camera directly and do not use one.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e10 mm focal length:\u003c\/strong\u003e medium-to-high power on most telescopes — the range where planetary detail appears without over-magnifying average seeing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e58° apparent field:\u003c\/strong\u003e wider than a classic orthoscopic, and enough that a planet stays in view for a usable interval on an undriven mount.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15 mm eye relief:\u003c\/strong\u003e a comfortable eye position rather than the pressed-in view short orthos demand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSix elements in four groups:\u003c\/strong\u003e the extra elements buy field width and eye relief while holding correction across the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal with the rest of the TOE range:\u003c\/strong\u003e swap focal lengths mid-session with only a touch of refocusing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened element edges and multi-layer coatings:\u003c\/strong\u003e suppress the internal scatter that washes out low-contrast planetary detail.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003ePlanetary observing is a contrast problem before it is a resolution problem. The features that matter — belt structure on Jupiter, the Cassini division, subtle shading on Mars — are low-contrast detail sitting on a bright disc, and any scattered light inside the eyepiece raises the background and buries them. That is why the classic four-element orthoscopic held on for decades: fewer air-glass surfaces, less scatter.\u003c\/p\u003e\u003cp\u003eThe TOE design accepts six elements in four groups and then attacks the scatter directly. Multi-layer coatings cut reflection at each surface, and the element edges are blackened so light striking them is absorbed rather than bounced back into the light path. The result keeps orthoscopic-class contrast while delivering a 58° field and 15 mm of eye relief — both well beyond what a four-element design produces at this focal length.\u003c\/p\u003e\u003cp\u003eParfocality across the range is a working convenience that matters more than it sounds: changing power on a planet mid-session without hunting for focus keeps you on the target while the seeing is steady.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary detail\u003c\/strong\u003e — Jupiter's belts and festoons, Saturn's rings and division, Martian surface shading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar observing\u003c\/strong\u003e — crater walls, rilles and terminator detail at medium-high power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble star splitting\u003c\/strong\u003e where contrast and clean star images matter more than field width.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrighter open clusters and planetary nebulae\u003c\/strong\u003e at medium power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDaytime and terrestrial use\u003c\/strong\u003e with a suitable diagonal, where the long eye relief is comfortable.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e divide your telescope's focal length by 10. An FS-60CB at 355 mm gives 35x; an FC-100DZ at 800 mm gives 80x; a Mewlon 210 at 2415 mm gives 242x.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagonal:\u003c\/strong\u003e in a refractor you will normally use it behind a star diagonal. The Takahashi 1.25-inch prism diagonal is a direct pairing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal range:\u003c\/strong\u003e parfocal with the other TOE eyepieces, so changing focal length needs only a touch of refocusing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e standard eyepiece filters thread into the barrel where the barrel size matches.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e58° is a moderate field, by design.\u003c\/strong\u003e If you want a 82° or 100° immersive view for sweeping deep-sky fields, this is not that eyepiece — it trades field width for contrast, which is the right trade on a planet and the wrong one on a large nebula.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification depends on your telescope.\u003c\/strong\u003e The same 10 mm gives 35x on a short 60 mm refractor and 242x on a Mewlon 210. Tell us your telescope and we will tell you where this lands in your eyepiece set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is a visual eyepiece.\u003c\/strong\u003e Camera trains connect directly to the telescope or its corrector.\u003c\/li\u003e\n\u003c\/ul\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 drops into a 1.25-inch diagonal or focuser and you focus. Nothing to assemble or adjust.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat magnification will I get?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour telescope's focal length divided by 10. Send us your telescope model and we will work out where it fits alongside the eyepieces you already own.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it compare to a classic orthoscopic?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA four-element ortho at 10 mm gives roughly a 42° to 45° field and short eye relief. The TOE gives 58° and 15 mm of eye relief from six elements, with coatings and blackened edges doing the contrast work the simpler design got from having fewer surfaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it good for deep-sky observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt works well on brighter open clusters and planetary nebulae. For large faint objects a wider field and longer focal length eyepiece suits better — this one is built around contrast at medium-high power.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e15 mm of eye relief is workable for many glasses wearers, though it depends on your frames and how far they hold the lens from your eye.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work with my Barlow or extender?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — a 2x Barlow makes it behave as a 5 mm. Takahashi's Ortho Extender 2X and 4X are the matched options.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it parfocal with my other Takahashi eyepieces?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is parfocal with the rest of the TOE range. Across other Takahashi families, expect to refocus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 10 mm planetary eyepiece with a 58° field and 15 mm of eye relief, built from six elements with the coatings and blackened edges that keep low-contrast detail visible. It is the comfortable medium-power eyepiece in a planetary set.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54046970871919,"sku":"TAK-TKA00618","price":480.48,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka00618.jpg?v=1786907851","url":"https:\/\/ontariotelescope.com\/products\/takahashi-toe-10mm-eyepiece","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}