{"product_id":"takahashi-toe-3-3mm-eyepiece-1-25","title":"Takahashi TOE 3.3mm Eyepiece - 1.25\"","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOE 3.3 mm is the shortest focal length in Takahashi's TOE range — a 1.25″ eyepiece built for high-magnification visual observing. Its six-element optical design minimises spherical and chromatic aberration, and the 52° apparent field matches that of Takahashi's LE series, with 10 mm of eye relief.\u003c\/p\u003e\u003cp\u003eAt 3.3 mm, this is a planetary and double-star eyepiece. On a 1000 mm telescope it delivers roughly 300x; on a 2500 mm Mewlon, above 750x — magnifications that reward good optics and steady seeing.\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, or close double stars and want the shortest focal length in the TOE line on a premium telescope.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.3 mm focal length:\u003c\/strong\u003e the highest magnification in the TOE range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e52° apparent field:\u003c\/strong\u003e matched to Takahashi's LE series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10 mm eye relief:\u003c\/strong\u003e consistent across the TOE line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSix-element design:\u003c\/strong\u003e minimises spherical and chromatic aberration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ barrel:\u003c\/strong\u003e fits any standard 1.25″ focuser or diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA short-focal-length eyepiece is the hardest kind to build well. Aberrations that stay invisible at 25 mm become obvious at 3.3 mm, and simple designs tend to give up eye relief as focal length falls — which is why cheap high-power eyepieces are so uncomfortable to use. The TOE answers both with six elements: enough degrees of freedom to control spherical and chromatic error while holding eye relief at 10 mm even at this focal length. Takahashi's stated aim for the range is performance close to the diffraction limit across the whole field when paired with a premium telescope.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eHigh-magnification visual observing: planetary detail, lunar features at the terminator, and splitting close double stars.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 1.25″ barrel fits any standard 1.25″ focuser, diagonal, or 2″-to-1.25″ adapter. Takahashi publishes this eyepiece as \u003cstrong\u003enot parfocal\u003c\/strong\u003e, so refocusing is needed when swapping to another eyepiece. The TOE line also includes 4 mm, 5.5 mm, 7.5 mm and 10 mm focal lengths, which we stock — if you are building a set and want to space the magnifications sensibly on your telescope, tell us the focal length and we will suggest a combination.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eA visual eyepiece:\u003c\/strong\u003e the TOE is designed for the eye rather than a sensor, and has no application in a prime-focus imaging train.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNot parfocal:\u003c\/strong\u003e swapping between TOE focal lengths needs a touch of refocusing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMagnification depends on your telescope:\u003c\/strong\u003e divide your focal length by 3.3. On longer instruments this eyepiece reaches magnifications that only steady seeing will support — which is exactly what it is built for, and worth pairing with a longer TOE for nights when the air is not cooperating.\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 drops into a 1.25″ focuser or diagonal like any eyepiece. It does need refocusing when you swap eyepieces, since the TOEs are not parfocal.\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 3.3. A 1000 mm telescope gives about 300x.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003ePlanets, the Moon, and close double stars — targets that reward high magnification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the eye relief comfortable?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e10 mm, which is generous for a 3.3 mm eyepiece; short focal lengths in simpler designs typically offer far less.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is a visual eyepiece and has no application in a prime-focus imaging train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi's shortest TOE — a six-element 3.3 mm eyepiece with a 52° field and 10 mm of eye relief, made for the nights when the seeing lets you push the magnification.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54086046449775,"sku":"TAK-TKA00614","price":474.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka00614_2_5.jpg?v=1787329004","url":"https:\/\/ontariotelescope.com\/products\/takahashi-toe-3-3mm-eyepiece-1-25","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}