{"product_id":"takahashi-fct-114ds-114mm-f-7-triplet-apochromatic-refractor-ota","title":"Takahashi FCT-114DS 114mm f\/7 Triplet Apochromatic Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FCT-114DS is Takahashi's 114 mm (4.5-inch) fluorite triplet apochromat, at 800 mm focal length and f\/7. It combines a fluorite element with a triplet lens arrangement, published with a visual Strehl ratio of 97.5%, and its tube extends from 795 mm to 884 mm. Optical tube weight is 11.2 lb.\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 114 mm apochromatic triplet for high-contrast lunar and planetary viewing, or double-star splitting, where the 97.5% Strehl ratio and near-elimination of chromatic error matter more than field width. It also suits astrophotographers willing to add a flattener or reducer — Takahashi's FC\/FS-family correctors are the starting point.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite triplet apochromat:\u003c\/strong\u003e a fluorite element paired with a triplet lens arrangement for a published 97.5% visual Strehl ratio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e800 mm at f\/7:\u003c\/strong\u003e in a 795–884 mm tube — 114 mm of aperture in a moderate-length instrument.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e11.2 lb optical tube weight,\u003c\/strong\u003e as Takahashi publishes it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-contrast optics:\u003c\/strong\u003e Takahashi states the design virtually eliminates chromatic aberration, aimed at lunar, planetary and stellar observation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FCT-114DS pairs a fluorite element with a triplet lens design — three elements working together to control both spherical and chromatic aberration more tightly than a doublet at the same aperture and speed, which is what a 97.5% Strehl ratio at f\/7 requires. Takahashi markets it for lunar observation, high-magnification planetary viewing and stellar work, where the design's tight correction shows most directly at the eyepiece.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing:\u003c\/strong\u003e high-magnification visual work benefiting from the design's tight chromatic correction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble star splitting:\u003c\/strong\u003e a well-corrected 114 mm aperture resolves close, faint pairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstrophotography with an add-on corrector:\u003c\/strong\u003e Takahashi notes that optional flatteners or focal reducers extend the tube to imaging use.\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\u003eThis is an optical tube assembly.\u003c\/strong\u003e Mount, rings, dovetail, diagonal and eyepiece are all sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo corrector is matched to this tube by name.\u003c\/strong\u003e Tell us how you plan to image with it and we will work out which flattener or reducer suits your sensor.\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 more than any refractor OTA — at prime focus with a diagonal and eyepiece it is straightforward.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLunar and planetary observing and double star splitting, where the published 97.5% Strehl ratio and tight chromatic correction do the most visible work.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the FCT-114DF?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBoth share the same published aperture, focal length and f-ratio.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eVisually and at prime focus, yes. For a flat, corrected field you would need a matched flattener.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 114 mm fluorite triplet apochromat at 800 mm and f\/7, with a published 97.5% Strehl ratio, built for high-resolution lunar, planetary and double-star viewing at 11.2 lb.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047058952303,"sku":"TAK-TCK11410","price":4676.1,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/screenshot_2026-07-27_at_2.04.42_pm.png?v=1786912104","url":"https:\/\/ontariotelescope.com\/products\/takahashi-fct-114ds-114mm-f-7-triplet-apochromatic-refractor-ota","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}