{"product_id":"takahashi-toa-130nfb-130mm-f-7-7-triplet-refractor-ota-with-mef-4-focuser","title":"Takahashi TOA-130NFB 130mm f\/7.7 Triplet Refractor OTA with MEF-4 Focuser","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-130NFB shares its 130 mm ED apochromatic triplet objective with the TOA-130NS, but ships with Takahashi's larger Micro Edge Focuser MEF-4 — a 4-inch dual-speed rack-and-pinion unit with a built-in camera angle adjuster, sized for medium-format imaging trains. The native focal length is 1000 mm at f\/7.7, published weight is 11.7 kg, and the back focus at prime focus runs 274.5 mm, noticeably longer than the NS variant's 222.5 mm because of the larger focuser body.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you are building a medium-format or heavier imaging train and want the longer back focus and larger focuser throat the MEF-4 provides — the built-in camera angle adjuster is aimed at photographers who need to rotate a bulkier camera body without disturbing the tube rings. At 11.7 kg published weight, it asks for a mount with real payload margin once accessories are attached.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHighly air-spaced ED triplet, 3 elements in 3 groups:\u003c\/strong\u003e two S-FPL53 ED elements deliver Takahashi's highest published order of color correction at this aperture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1000 mm focal length at f\/7.7:\u003c\/strong\u003e strong native resolving power for planetary, lunar and tight deep-sky targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicro Edge Focuser MEF-4 included:\u003c\/strong\u003e a 4-inch dual-speed rack-and-pinion focuser with a built-in camera angle adjuster for medium-format photography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e274.5 mm back focus at prime focus:\u003c\/strong\u003e published by Takahashi, noticeably longer than the TOA-130NS's 222.5 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield:\u003c\/strong\u003e tube length runs from 1022 mm to 1153 mm as it extends.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnife-edged internal baffles:\u003c\/strong\u003e reduce internal reflections and improve contrast.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-130NFB uses the same highly air-spaced triplet objective as the TOA-130NS — two S-FPL53 ED elements for Takahashi's highest published order of color correction at this aperture — paired with the larger MEF-4 focuser instead of the MEF-2.7. That focuser change is what shifts the back focus from 222.5 mm to 274.5 mm and adds roughly 1.8 kg to the published tube weight. At f\/7.7 and 1000 mm focal length, the optical performance is identical to the NS variant; the difference is entirely in what the focuser and its camera angle adjuster support downstream. The design accepts the same TOA-series correctors as the NS: the TOA-35FL field corrector runs 980 mm at f\/7.5 with a 40 mm image circle, and the 67FL corrector holds the full 1000 mm focal length at f\/7.7 with a substantially larger 92 mm image circle for medium-format sensors.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eMedium-format and full-frame deep-sky astrophotography where the larger image circle and camera angle adjuster matter; high-resolution planetary and lunar visual observation; observatory setups on a mount rated well above the 11.7 kg tube weight.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAt prime focus, back focus runs 274.5 mm — longer than most Takahashi refractors, which is worth checking against your existing adapter stack before ordering. Adding the TOA-35FL corrector changes that to a 40 mm image circle at 980 mm and f\/7.5, while the 67FL corrector opens the image circle to 92 mm at the native 1000 mm focal length and f\/7.7 for medium-format cameras. The \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists these figures in full, and we're glad to confirm a specific camera and filter setup against them before you order. Note that the closely related TOA-130NS carries a different published weight (9.9 kg) and a shorter back focus (222.5 mm) due to its smaller MEF-2.7 focuser; the two are separate products, not variants of one another.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eMount, tripod, and finder are sold separately:\u003c\/strong\u003e this listing is the optical tube assembly with the MEF-4 focuser attached.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe longer back focus changes your adapter stack:\u003c\/strong\u003e at 274.5 mm, this tube needs more spacing than most Takahashi refractors reach natively — worth confirming against your camera train before ordering.\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 is a fixed-mirror-free refractor with nothing to collimate in normal use. The MEF-4 focuser's camera angle adjuster is a built-in mechanical rotator, not a separate accessory to fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMedium-format and full-frame astrophotography, plus high-resolution planetary and lunar visual observation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need extra accessories for imaging?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor a flat field, yes — the TOA-35FL or 67FL corrector, matched to the image circle and back focus your camera needs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat mounts is it suited to?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA mount rated comfortably above the 11.7 kg published tube weight once a full imaging accessory load is added.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the TOA-130NS?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBoth share the same 130 mm optical design, but the NS ships with the smaller MEF-2.7 focuser, weighs less at 9.9 kg, and has a shorter 222.5 mm back focus — the two are separate products, not interchangeable configurations of one tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: the same 130 mm f\/7.7 ED apochromatic triplet as the TOA-130NS, built around the larger MEF-4 focuser for a longer back focus and medium-format imaging support.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047051645039,"sku":"TAK-TOK13210","price":9666.8,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TOK13210_TOA-130NFB_OTA_1.jpg?v=1786911795","url":"https:\/\/ontariotelescope.com\/products\/takahashi-toa-130nfb-130mm-f-7-7-triplet-refractor-ota-with-mef-4-focuser","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}