{"title":"Takahashi Refractors","description":"\u003cp\u003eTakahashi refracting telescopes — fluorite and ED apochromats from 60 mm to 150 mm. The FC and FS doublets use a fluorite crystal element for colour correction in two elements; the TOA and TSA triplets and the FSQ Petzval astrographs add elements for flatter fields and wider corrected circles. Every tube pairs with a published flattener, reducer or extender, and a system chart that names the exact spacing.\u003c\/p\u003e","products":[{"product_id":"takahashi-fs-60cb-60mm-f5-9-fluorite-refractor-ota","title":"Takahashi FS-60CB 60mm f\/5.9 Fluorite Doublet Apochromatic Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60CB is Takahashi's 60 mm fluorite doublet apochromat, built in Tokyo and sold here as an optical tube assembly. At 355 mm focal length and f\/5.9 it is a short, light instrument — 413 mm long, 80 mm across the tube, and 1.1 kg — which puts it within reach of almost any tracking mount, including small travel heads and star trackers.\u003c\/p\u003e\u003cp\u003eWhat separates it from other 60 mm refractors is that the tube is a platform rather than a fixed configuration. The rear cell accepts a field flattener, a 0.85x focal reducer, or a 1.7x extender, and each one changes the telescope's working focal length and field. The same tube covers 300 mm at f\/5.0 for wide-field imaging, 370 mm at f\/6.2 with a flat 44 mm corrected circle, and 600 mm at f\/10 for lunar and planetary work.\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 small, genuinely apochromatic refractor that travels well and can be reconfigured rather than replaced. Wide-field imagers use it reduced, at 300 mm and f\/5.0, to frame large emission nebulae on an APS-C sensor. Visual observers use it at prime focus or extended for lunar detail and double stars. Eclipse chasers take it because it fits in a carry-on and holds focus in changing temperature.\u003c\/p\u003e\u003cp\u003eIt also works as a guide scope or a second imaging tube alongside a larger instrument, and as a high-quality daytime spotting scope with a diagonal and eyepiece.\u003c\/p\u003e\u003cp\u003eIf you are buying your first telescope and want one box that works out of the box, this is not that — it is an OTA, and you will be choosing a mount, a diagonal and an eyepiece alongside it. Tell us how you plan to use it and we will put the pieces together with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-spaced fluorite doublet:\u003c\/strong\u003e two elements in two groups, with a genuine fluorite crystal element rather than an ED-glass substitute.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHard multicoatings:\u003c\/strong\u003e applied to the fluorite surfaces, which are softer and more hygroscopic than glass and need the protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e355 mm at f\/5.9:\u003c\/strong\u003e a 60 mm aperture in a 413 mm tube — short enough to balance on a light mount, long enough to reach useful magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e162 mm of back focus:\u003c\/strong\u003e generous rear spacing, which is what allows the flattener, reducer and extender modules to fit without running out of focus travel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack-and-pinion focuser\u003c\/strong\u003e with 30 mm of drawtube extension.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e80 mm dew shield:\u003c\/strong\u003e retracts over the tube for transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.1 kg:\u003c\/strong\u003e light enough that mount payload is rarely the limiting factor.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective is a two-element air-spaced doublet built around a fluorite crystal element. Fluorite has anomalous partial dispersion that ordinary optical glass cannot reproduce, and in a doublet it brings the red, green and blue focal points close enough together that secondary spectrum is not the limiting factor at this aperture. In practice that means clean white stars and no violet fringing on the lunar limb or on bright planets — the failure mode that defines cheaper short refractors.\u003c\/p\u003e\u003cp\u003eBecause fluorite is softer and more sensitive to moisture than glass, Takahashi applies hard multicoatings to the exposed surfaces. These also cut internal reflections, which matters when the target is a bright object against a dark field.\u003c\/p\u003e\u003cp\u003eThe 162 mm of back focus is the design decision that makes the FS-60CB modular. Most short refractors leave just enough room for a camera and nothing else. The extra rear space here is what lets a 0.85x reducer, a 1.04x flattener or a 1.7x extender sit in the light path and still reach focus — so one tube covers f\/5.0 through f\/10.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field deep-sky imaging:\u003c\/strong\u003e with the 60C RD NC 0.85x reducer at 300 mm and f\/5.0, covering a 44 mm image circle — large nebulae, the Andromeda field, wide Milky Way regions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field imaging at prime focus:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 370 mm and f\/6.2, corrected across 44 mm — full-frame coverage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary:\u003c\/strong\u003e with the EX CQ 1.7x extender at 600 mm and f\/10, which is the FS-60Q configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar eclipse work:\u003c\/strong\u003e short, light, and quick to set up on a travel mount, with a suitable solar filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e open clusters, double stars, lunar detail and bright planets with a diagonal and eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuiding and dual-rig imaging:\u003c\/strong\u003e as a second tube beside a larger instrument.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60CB has a published system chart — included in the Downloads tab — that names every adapter, ring and spacer for each configuration, along with the exact distances. It is the fastest way to confirm a train before ordering, and it removes the guesswork that usually surrounds backfocus. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range in one table.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 162 mm at prime focus, measured from the rear end of the focuser to the focal plane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e the FC\/FS MFL 1.04x needs the CA-60C ring (Takahashi part TKA20203) on this telescope, and gives 370 mm at f\/6.2 with a 44 mm corrected circle at 87.5 mm of back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal reducer:\u003c\/strong\u003e the 60C RD NC 0.85x brings the tube to 300 mm at f\/5.0 with a 44 mm corrected circle at 56.0 mm of back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtender:\u003c\/strong\u003e the EX CQ 1.7x converts the tube to the FS-60Q configuration — 600 mm at f\/10, 44 mm circle, 158.4 mm of back focus. The EX-C2X and EX-Q extenders each have their own system chart, both included below.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual train:\u003c\/strong\u003e a 1.25-inch or 2-inch diagonal and eyepiece attach through the matching Takahashi visual adapter. The Takahashi 1.25-inch prism diagonal is a direct fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail are included. At 1.1 kg the tube suits small equatorial and travel mounts once a camera or diagonal is added.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinder and rings:\u003c\/strong\u003e tube rings, a dovetail plate and a finder bracket are separate purchases. Takahashi recommends a 6x30 finder for this tube.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure which corrector and ring combination your camera needs, send us your camera model, filter thickness and any spacers you already own and we will work the train out with you before you order.\u003c\/p\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, tripod, tube rings, dovetail, diagonal, eyepiece and finder are all sold separately. We can quote a complete setup if that is easier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field needs a corrector.\u003c\/strong\u003e At prime focus the field curves, as it does on any short doublet. The FC\/FS MFL 1.04x flattens it to 44 mm; the 60C RD NC 0.85x reducer flattens and shortens at once.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe flattener needs its own CA ring.\u003c\/strong\u003e On the FS-60CB that is the CA-60C (TKA20203). The system chart in the Downloads tab lists the part for every configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite needs ordinary care.\u003c\/strong\u003e The coatings protect it, and the retractable dew shield helps in dew. Standard optical cleaning practice is all it asks for.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60 mm is 60 mm.\u003c\/strong\u003e It resolves and gathers light like a 60 mm aperture, and its strength is field, portability and colour correction rather than reach on faint galaxies.\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. At prime focus it is a diagonal and an eyepiece and you are observing. Imaging trains take more thought because the spacing matters, and Takahashi publishes a system chart for every configuration — it is in the Downloads tab, and it names the parts and distances so there is no trial and error. Send us your camera details and we will confirm the train with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field imaging and portable visual work. Reduced to 300 mm at f\/5.0 it frames large nebulae; extended to 600 mm at f\/10 it shows lunar and planetary detail. Few telescopes cover that range without swapping tubes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for astrophotography without buying anything else?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYou can attach a camera at prime focus, but the field will curve at the edges. For flat stars across an APS-C or full-frame sensor you need the flattener and its CA ring, or the 0.85x reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FS-60CB and the FS-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FS-60Q is the FS-60CB with the EX CQ 1.7x extender module fitted — 600 mm at f\/10 instead of 355 mm at f\/5.9. Buying the CB and adding the extender later reaches the same place.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on a star tracker?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt 1.1 kg it is within range of the larger travel trackers once a camera is attached, though the total load and the tracker's rated capacity are worth checking together. Tell us which tracker you have and we will confirm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs fluorite better than ED glass?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFluorite is a crystal, not a glass, and its dispersion behaviour is what a two-element design needs to control colour. It is why this doublet performs like designs that otherwise take three elements. It is also softer, which is why the coatings matter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it come with a case?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — the OTA ships without a case.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 60 mm fluorite apochromat at 355 mm and f\/5.9 that reconfigures to 300 mm at f\/5.0 or 600 mm at f\/10, weighs 1.1 kg, and comes with published system charts for every one of those configurations. Add a mount, a corrector matched to your camera, and it covers wide-field imaging through planetary detail from one tube.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54046912643183,"sku":"TAK-TSK06210\/TSK06010","price":1158.3,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/fs-60cb_1_2_3.jpg?v=1786907612"},{"product_id":"takahashi-fsq-80fc-80mm-f-5-6-quintuplet-astrograph-refractor-ota","title":"Takahashi FSQ-80FC 80mm f\/5.6 Quintuplet Astrograph Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-80FC is Takahashi's compact 80 mm imaging refractor, built around a 5-element optical design with dual fluorite elements. At a native 450 mm focal length and f\/5.6, it is intended as a wide-field astrograph rather than a visual scope — the flat field and 50 mm image circle cover a full-frame sensor without a separate flattener. Takahashi lists a tube weight of approximately 4.1 kg.\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 wide-field, grab-and-go imaging refractor that travels light — the compact tube and roughly 4.1 kg weight suit a smaller equatorial mount or a travel setup, and the flat 50 mm image circle covers full-frame sensors without an accessory flattener to buy separately.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-element optical design with dual fluorite elements:\u003c\/strong\u003e corrects chromatic aberration and field curvature within the tube, without a separate corrector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e450 mm focal length at f\/5.6:\u003c\/strong\u003e a fast, wide field of view suited to nebulae, star clusters and large-scale mosaic targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50 mm image circle:\u003c\/strong\u003e covers full-frame sensors with a flat field, as published by Takahashi.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNative M48 interface with 55 mm back focus:\u003c\/strong\u003e supports direct camera attachment with minimal adapter stacking, reducing flexure in the imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetracting dew shield:\u003c\/strong\u003e tube length runs 486 mm retracted to 559 mm extended for storage and transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack-and-pinion focuser:\u003c\/strong\u003e holds a full imaging train of camera, filter wheel and guider.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-80FC carries Takahashi's quintuplet Petzval-derived design — five elements including two fluorite lenses — aimed at flattening the field and correcting color across the frame without a separate flattener accessory. At f\/5.6 and 450 mm focal length it trades focal length for field width and speed, the combination astrographs are built around. The aluminum tube and fully multi-coated optics are typical of the FSQ line's imaging-first design; where Takahashi's other refractors are sold as visual-capable OTAs with an optional flattener, the FSQ-80FC's flattening is built into the base optical prescription.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky astrophotography of nebulae, large star clusters and galaxy fields; full-frame mosaic imaging; travel and portable imaging rigs where tube weight and length matter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes a 55 mm back focus from the native M48 interface, which is enough to seat most cooled cameras directly or with a thin adapter stack — filter wheels and off-axis guiders add up quickly against that figure, so it is worth checking your full imaging train before ordering.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003ePublished weight is approximate:\u003c\/strong\u003e Takahashi's own listing states \"approx. 4.1 kg\" rather than an exact figure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMount and tripod are not included:\u003c\/strong\u003e this listing is the optical tube assembly only.\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 — the flattening is built into the optics, so there is no separate corrector to thread on and space out. The M48 interface accepts a camera directly once your adapter stack is sorted.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field deep-sky astrophotography where a fast, short-focal-length refractor covers more sky per frame than a longer telescope.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is built and marketed as an imaging astrograph; its native interface and back focus are set for a camera, not an eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat cameras does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAny camera that reaches the 55 mm back focus through the M48 interface, including full-frame cooled CMOS and CCD cameras — send us your camera and filter setup and we will work it out with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the FSQ-85EDX?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThey are separate optical designs, each on its own specification sheet — figures for one do not describe the other.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a compact 80 mm f\/5.6 quintuplet astrograph with a built-in flattener, a 50 mm image circle, and roughly 4.1 kg of travel-friendly weight, built for wide-field imaging over visual use.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047049384047,"sku":"TAK-TQE08041","price":6263.4,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/fsq-80fc_-1-1024x576_jpg.png?v=1786911606"},{"product_id":"takahashi-tsa-120-120mm-f-7-5-triplet-apochromatic-refractor-ota","title":"Takahashi TSA-120 120mm f\/7.5 Triplet Apochromatic Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TSA-120 is Takahashi's 120 mm air-spaced ED triplet apochromat, built around a native 900 mm focal length at f\/7.5. The three-element, three-group design uses an ED lens between two conventional elements to control chromatic error across the visual and near-infrared range, and the tube is rated at 6.1 kg. It works as a visual instrument straight out of the box and as an imaging platform once paired with Takahashi's TOA-series correctors, with the drawtube extending from 870 mm to 990 mm for focus travel.\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 mid-aperture apochromat that does both jobs well — sharp, high-contrast planetary and lunar views at f\/7.5, and a capable imaging platform once you add a reducer or flattener. At 6.1 kg it sits comfortably on a mid-size equatorial mount, making it a reasonable step up for an observer moving past a smaller refractor toward more resolving power.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-spaced ED triplet, 3 elements in 3 groups:\u003c\/strong\u003e controls chromatic aberration across the visual and imaging range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e900 mm focal length at f\/7.5:\u003c\/strong\u003e resolves fine planetary and lunar detail and frames smaller deep-sky targets tightly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e227.5 mm back focus at prime focus:\u003c\/strong\u003e published by Takahashi for direct visual or imaging use without a corrector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.7-inch rack-and-pinion focuser:\u003c\/strong\u003e holds heavier imaging trains without sagging under a full camera and filter wheel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield:\u003c\/strong\u003e tube length runs from 870 mm retracted to 990 mm extended for storage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e125 mm tube diameter, 160 mm at the dew shield:\u003c\/strong\u003e a substantial aperture-to-tube ratio built for stiffness.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TSA-120's triplet objective places an ED element between two conventional glass lenses, air-spaced rather than cemented, which is how Takahashi controls both chromatic aberration and spherical correction across this aperture. At f\/7.5 and 900 mm focal length it is slower than Takahashi's dedicated astrographs, trading imaging speed for the longer native focal length and higher resolving power that favor planetary and lunar work, along with tighter deep-sky framing. The design accepts Takahashi's TOA-35 series correctors: the TOA-35FL field corrector holds the native 900 mm focal length at f\/7.3 with a 40 mm image circle and 117.5 mm back focus, while the TOA-35RD 0.7x reducer drops the system to 635 mm at f\/5.3 with a 44 mm image circle and 62.5 mm back focus for wider-field imaging.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eVisual observation of planets, the Moon, and double stars at f\/7.5; deep-sky and planetary astrophotography once paired with a TOA-series corrector; a mid-aperture apochromat for an observatory or a portable mount setup.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAt prime focus the back focus runs 227.5 mm, measured to the maximum drawtube extension from the rear of the 50.8 mm adapter. Adding the TOA-35FL corrector changes that to 117.5 mm at f\/7.3, and the TOA-35RD reducer changes it to 62.5 mm at f\/5.3 — each accessory resets both the focal ratio and the spacing your imaging train needs to hit. The \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists these figures alongside Takahashi's other refractor and corrector combinations, and we're glad to confirm a specific camera and filter setup against them before you order.\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 only.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eImaging performance depends on the matched corrector:\u003c\/strong\u003e the bare optical tube is optimized for visual use and longer-focal-length imaging; a TOA-35FL or TOA-35RD is what unlocks the flatter field and shorter effective focal length most deep-sky imaging trains want.\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, and the retractable dew shield and rack-and-pinion focuser are straightforward to operate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigh-resolution visual observation of planets and the Moon at native f\/7.5, and deep-sky imaging once paired with the TOA-35FL or TOA-35RD.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need extra accessories for imaging?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor flat-field imaging, yes — the TOA-35FL corrector or TOA-35RD reducer, matched to the back focus your camera train needs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat mounts is it suited to?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA mid-size equatorial mount rated comfortably above 6.1 kg once a full imaging or visual 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\u003eThe TOA-130NS steps up in aperture to 130 mm with a longer 1000 mm focal length and a dual-speed Micro Edge focuser; the TSA-120 is the lighter, shorter-tube option at 120 mm.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 120 mm f\/7.5 air-spaced ED triplet apochromat that handles planetary and lunar visual work natively and steps into flat-field imaging with a matched TOA-35 corrector.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047050432623,"sku":"TAK-TTK12010","price":6363.5,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TTK12010_TSA-120_OTA_1.jpg?v=1786911656"},{"product_id":"takahashi-toa-130ns-130mm-f-7-7-triplet-refractor-ota-with-mef-2-7-focuser","title":"Takahashi TOA-130NS 130mm f\/7.7 Triplet Refractor OTA with MEF-2.7 Focuser","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-130NS is Takahashi's 130 mm ED apochromatic triplet, built around a highly air-spaced three-element objective for the highest order of color correction Takahashi offers at this aperture. The native focal length is 1000 mm at f\/7.7, and the tube ships with the Micro Edge Focuser MEF-2.7, a dual-speed 2.7-inch rack-and-pinion unit sized for the load of a full imaging or visual accessory train. Published catalog weight is 9.9 kg, and the tube extends from 1013 mm to 1144 mm as the drawtube travels.\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 serious resolving power in a refractor — 130 mm of ED apochromatic aperture at f\/7.7 handles detailed planetary and lunar work and tight deep-sky framing, and the MEF-2.7 focuser is built to carry heavier imaging accessories without flexing. It suits an observer or imager stepping up from a smaller apochromat who has a mount rated well above the 9.9 kg tube weight 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-2.7 included:\u003c\/strong\u003e a dual-speed 2.7-inch rack-and-pinion focuser built for heavier imaging trains.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e222.5 mm back focus at prime focus:\u003c\/strong\u003e published by Takahashi for the native configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield:\u003c\/strong\u003e tube length runs from 1013 mm to 1144 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-130NS objective is a highly air-spaced triplet using two S-FPL53 ED elements, a configuration Takahashi builds specifically to push color correction beyond what a standard doublet or single-ED triplet achieves. At f\/7.7 and 1000 mm focal length, it favors resolving power and reach over imaging speed, and the hard multicoated optics and knife-edged baffles are aimed at high-contrast planetary and lunar views as much as deep-sky imaging. The design accepts a family of Takahashi correctors: the TOA-35FL field corrector holds close to the native focal length at 980 mm, f\/7.5, with a 40 mm image circle and 117.5 mm back focus; the TOA-645FL flattener runs 990 mm at f\/7.6 with a larger 60 mm image circle and 56.2 mm back focus for medium-format sensors; and the TOA-35RD 0.7x reducer drops the system to 698 mm at f\/5.4 with a 44 mm image circle and 65.5 mm back focus for wider-field imaging.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eHigh-resolution visual observation of planets, the Moon and double stars; tight-framing deep-sky and planetary astrophotography; medium-format imaging once paired with the TOA-645FL flattener; observatory or serious amateur setups on a mount rated well above the 9.9 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 222.5 mm. Adding the TOA-35FL corrector changes that to 117.5 mm at f\/7.5; the TOA-645FL flattener changes it to 56.2 mm at f\/7.6 with a 60 mm image circle for medium-format cameras; and the TOA-35RD reducer changes it to 65.5 mm at f\/5.4. Each accessory resets both the focal ratio and the spacing your imaging train needs to hit, and the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists all three configurations in full — send us your camera and filter setup and we will confirm the fit with you. Note that the closely related TOA-130NFB carries a different published weight (11.7 kg) and a different back focus (274.5 mm) due to its larger MEF-4 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-2.7 focuser attached.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eImaging performance depends on the matched corrector:\u003c\/strong\u003e the bare optical tube favors visual use and longer-focal-length imaging; the TOA-35FL, TOA-645FL, or TOA-35RD is what flattens the field for most deep-sky imaging trains.\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-2.7 focuser is a standard dual-speed rack-and-pinion unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigh-resolution planetary and lunar visual observation, tight deep-sky framing, and imaging once paired with a TOA-series corrector.\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, TOA-645FL, or TOA-35RD, matched to the back focus your camera train 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 9.9 kg published tube weight once a full imaging or visual accessory load is added.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the TOA-130NFB?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBoth share the same 130 mm optical design, but the NFB ships with the larger MEF-4 focuser, weighs more at 11.7 kg, and has a longer 274.5 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: a 130 mm f\/7.7 ED apochromatic triplet with the dual-speed MEF-2.7 focuser included, built for high-resolution visual work and flat-field imaging once paired with a TOA-series corrector.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047051350127,"sku":"TAK-TOK13010","price":8580.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TOK13010_TOA-130NS_OTA_1.jpg?v=1786911747"},{"product_id":"takahashi-fs-60cp-60mm-f-5-9-fluorite-doublet-apochromatic-refractor-ota","title":"Takahashi FS-60CP 60mm f\/5.9 Fluorite Doublet Apochromatic Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60CP is Takahashi's fixed-tube 60 mm fluorite doublet apochromat, built around the same objective as the FS-60CB but housed in a longer, 95 mm-diameter tube with a permanently mounted camera angle adjuster. At 355 mm focal length and f\/5.9 it shares the CB's optical formula and most of its conversion-lens options, but the longer tube gives it 197.8 mm of back focus at prime focus — well over the CB's 162 mm — which is what lets it run Takahashi's newer FU-series reducer without running out of drawtube travel. Attach the 60CP FURD 0.65x reducer and it becomes a 230 mm f\/3.8 astrograph.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you already know you want a wide-field imaging platform and would rather buy the longer-backfocus tube outright than add a spacer later. It suits imagers running the FU reducer for fast, flat fields, and anyone assembling a permanent imaging rig rather than a travel kit that gets reconfigured on site. It is less suited to observers who want the shortest, most collapsible package — the FS-60CB's retractable dew shield is the better fit there.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-spaced fluorite doublet:\u003c\/strong\u003e the same two-element, two-group objective used in the FS-60CB — a genuine fluorite crystal element, not an ED-glass substitute.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e355 mm at f\/5.9:\u003c\/strong\u003e 60 mm aperture, native prime-focus figures identical to the CB.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e197.8 mm of back focus:\u003c\/strong\u003e a fixed 95 mm tube gives substantially more rear clearance than the CB's 162 mm, built for reducer and flattener use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera angle adjuster:\u003c\/strong\u003e built into the rear cell, for rotating framing without disturbing focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e63 mm drawtube extension\u003c\/strong\u003e on a rack-and-pinion focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.8 kg:\u003c\/strong\u003e heavier than the CB by the length of tube, still light for most imaging mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective is the same two-element, air-spaced fluorite doublet used across the FS-60 line — fluorite's anomalous partial dispersion pulls the red, green and blue focal points close enough together that a two-element design performs like a more complex triplet at this aperture, without the violet fringing that limits ordinary short achromats. Hard multicoatings protect the fluorite surface and cut internal reflections.\u003c\/p\u003e\u003cp\u003eWhat distinguishes the CP from the CB is the tube itself, not the glass. The 95 mm barrel is fixed rather than telescoping, and the extra length shifts the back focus out to 197.8 mm at prime focus — room enough for the 60CP FURD 0.65x reducer to reach focus, a part specified for this tube's back focus and not interchangeable with the CB's reducer. Takahashi notes that focus to infinity is not available in the base configuration without the correct diagonal or extension in the visual train, worth checking against the eyepiece setup you plan to use.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast wide-field imaging:\u003c\/strong\u003e with the 60CP FURD 0.65x reducer at 230 mm and f\/3.8, for large nebulae and wide star fields.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field imaging at prime focus:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 370 mm and f\/6.2, corrected across a 44 mm circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced-field imaging:\u003c\/strong\u003e with the 60C RD NC 0.85x reducer at 300 mm and f\/5.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e lunar, double-star and wide-field work with a diagonal and eyepiece, keeping the infinity-focus note above in mind.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60CB and FS-60CP share the flattener and 0.85x reducer, but the 60CP FURD 0.65x reducer is built specifically for the CP's longer back focus and is a different part from the CB's reducer. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists the figures for both tubes side by side, which is the fastest way to confirm a train before ordering.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 197.8 mm at prime focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e FC\/FS MFL 1.04x — 370 mm, f\/6.2, 44 mm circle, 87.5 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal reducer:\u003c\/strong\u003e 60C RD NC 0.85x — 300 mm, f\/5.0, 44 mm circle, 56.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFU reducer:\u003c\/strong\u003e 60CP FURD 0.65x — 230 mm, f\/3.8, 44 mm circle, 56.0 mm back focus measured from the rear of the adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure which reducer or CA ring your camera needs, send us your camera and filter setup and we will work it out with you.\u003c\/p\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, tripod, rings, dovetail, diagonal, eyepiece and finder are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocus to infinity needs the right visual train.\u003c\/strong\u003e Takahashi notes the base configuration does not reach infinity focus without the correct extension tube or diagonal in place — worth checking against the eyepiece or diagonal you plan to use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe CP's FU reducer is model-specific.\u003c\/strong\u003e The 60CP FURD 0.65x is built for this tube's back focus and is a different part from the CB's reducer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field needs a corrector.\u003c\/strong\u003e At prime focus the field curves; the flattener or reducer corrects it.\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 — at prime focus it is a diagonal and eyepiece, or a camera and the appropriate spacer. The one detail worth checking ahead of time is the visual train reaching infinity focus, which depends on the diagonal or extension used; tell us your setup and we will confirm it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FS-60CB and FS-60CP?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame objective and focal length, different tube. The CP's fixed 95 mm barrel gives 197.8 mm of back focus against the CB's 162 mm, and that extra room is what the FU reducer needs to reach focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field imaging, particularly with the FU reducer at f\/3.8, where the extra back focus over the CB matters most.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt prime focus, yes, for a flat field to the edge — the MFL 1.04x flattener or the 0.85x\/0.65x reducers each correct it differently.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use FS-60CB accessories on this tube?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe flattener and 0.85x reducer are shared. The FU reducer is specific to the CP's back focus and is a separate part from the CB's reducer.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 60 mm fluorite apochromat at 355 mm and f\/5.9, built into a fixed 95 mm tube with 197.8 mm of back focus for reducer and flattener work — and a 230 mm f\/3.8 astrograph once the FU reducer is attached.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047051382895,"sku":"TAK-TSK06410","price":1415.7,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tsk06410-1.jpg?v=1786911768"},{"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"},{"product_id":"takahashi-fs-60q-60mm-f-10-fluorite-quadruplet-refractor-ota","title":"Takahashi FS-60Q 60mm f\/10 Fluorite Quadruplet Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60Q is Takahashi's long-focal-length version of the FS-60 platform — the same 60 mm fluorite doublet as the FS-60CB, but with the EX CQ 1.7x extender permanently built into the optical path as a third and fourth element. The result is a 4-element, 3-group apochromat running natively at 600 mm and f\/10, in a 550 mm tube weighing 1.4 kg. Where the CB is bought and reconfigured, the Q is bought already set up for reach.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you know you want the longer focal length rather than a modular tube you configure yourself — lunar and planetary observers who want more image scale from a 60 mm aperture, and imagers targeting smaller, brighter deep-sky objects where 600 mm suits the framing. It suits anyone who wants one dedicated configuration rather than swapping reducers and extenders between sessions.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite quadruplet:\u003c\/strong\u003e four elements in three groups — the FS-60 doublet plus a built-in 1.7x extender group, rather than a separate accessory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e600 mm at f\/10:\u003c\/strong\u003e native focal length and ratio, with a 44 mm corrected image circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e158.4 mm of back focus:\u003c\/strong\u003e ample room for a diagonal, filter wheel or imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack-and-pinion focuser\u003c\/strong\u003e with 30 mm of drawtube extension.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e80 mm dew shield\u003c\/strong\u003e over an 80 mm tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.4 kg:\u003c\/strong\u003e light enough for small equatorial and travel mounts even at this focal length.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe front two elements are the same air-spaced fluorite doublet used in the FS-60CB, and Takahashi has permanently mated the CQ 1.7x extender group behind it rather than leaving it as a separate accessory. That turns a 355 mm f\/5.9 doublet into a 600 mm f\/10 quadruplet with a corrected 44 mm image circle — image scale and reach that a 60 mm objective does not otherwise offer, without the secondary-spectrum penalty a plain Barlow would add at this aperture.\u003c\/p\u003e\u003cp\u003eFluorite's anomalous partial dispersion is what makes the front doublet capable of triplet-like colour correction from two elements, and the same hard multicoatings used across the FS-60 range protect the fluorite surface here. The 158.4 mm of back focus is generous for a scope this compact, which is what makes room for a full imaging train — filter wheel, off-axis guider, or a diagonal and eyepiece — without running out of focus travel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary imaging:\u003c\/strong\u003e at 600 mm and f\/10, more image scale than the FS-60CB's native 355 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmaller deep-sky targets:\u003c\/strong\u003e planetary nebulae and galaxy cores that need more focal length than a wide-field refractor provides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-power visual observing:\u003c\/strong\u003e lunar detail, double stars and planets with a diagonal and eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuiding and dual-rig imaging:\u003c\/strong\u003e as a longer-focal-length second tube beside a wide-field imaging setup.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60Q's back focus and image circle are published on Takahashi's own system chart, included in the Downloads tab, along with the adapters and distances for a visual or imaging train. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole FS-60 range in one table.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 158.4 mm, measured from the rear of the focuser to the focal plane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage circle:\u003c\/strong\u003e 44 mm, corrected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual train:\u003c\/strong\u003e a 1.25-inch or 2-inch diagonal and eyepiece attach through the matching Takahashi visual adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included. At 1.4 kg it suits small equatorial and travel mounts once a camera or diagonal is added.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinder and rings:\u003c\/strong\u003e tube rings, a dovetail plate and a finder bracket are separate purchases.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure whether your camera and filter setup will reach focus, send us the details and we will work it out with you.\u003c\/p\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, tripod, rings, dovetail, diagonal, eyepiece and finder are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe extender is built in, not removable.\u003c\/strong\u003e Unlike the FS-60CB with an accessory extender, the FS-60Q's 1.7x group is a permanent part of the optical path — there is no shorter native configuration on this tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60 mm is 60 mm.\u003c\/strong\u003e Resolution and light gathering follow the aperture; the FS-60Q's advantage is focal length and image scale, not more light.\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 — at prime focus it is a diagonal and eyepiece and you are observing, or a camera and the published back focus for imaging. Takahashi's system chart in the Downloads tab lists the adapters and distances.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLunar and planetary observing and imaging, and smaller deep-sky targets that benefit from 600 mm of focal length over a wide-field refractor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FS-60Q and the FS-60CB?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FS-60Q is built with the CQ 1.7x extender permanently in the optical path — 600 mm at f\/10 instead of the CB's native 355 mm at f\/5.9. The CB reaches the same 600 mm configuration with an accessory extender; the Q is bought already set up for it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe quadruplet design already delivers a corrected 44 mm image circle at 600 mm without an additional flattener.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on a star tracker or small mount?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt 1.4 kg the tube itself is light, though 600 mm of focal length asks more of tracking accuracy than a wide-field scope does. Tell us which mount you are using and we will confirm the fit.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 60 mm fluorite quadruplet apochromat running natively at 600 mm and f\/10, with a corrected 44 mm image circle and 158.4 mm of back focus, in a 1.4 kg tube built for lunar, planetary and small-target work.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047053054063,"sku":"TAK-TSK06310","price":1515.8,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/afcf724e6cf6ce7113b6e7e865891435.jpg?v=1786911819"},{"product_id":"takahashi-toa-150b-150mm-f-7-3-triplet-apochromatic-refractor-ota","title":"Takahashi TOA-150B 150mm f\/7.3 Triplet Apochromatic Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-150B is the largest refractor in Takahashi's TOA line, a 150 mm highly air-spaced ED apochromatic triplet built for a native 1100 mm focal length at f\/7.3. Two S-FPL53 ED elements deliver Takahashi's highest published order of color correction, and the published tube weight is 14.5 kg — a figure that puts real demands on the mount underneath it once accessories are attached. The dew shield retracts the tube from 1270 mm down to 1110 mm for storage, and the 4-inch dual-speed rack-and-pinion focuser with camera angle adjuster ships as part of the assembly.\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 the largest aperture Takahashi's TOA refractor line offers and have a mount and pier rated well above the 14.5 kg tube weight — an observatory pier or a large German equatorial mount rather than a portable setup. It suits an observer or imager who has already worked with a smaller apochromat and is stepping up specifically for the resolving power and light grasp a 150 mm aperture provides.\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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1100 mm focal length at f\/7.3:\u003c\/strong\u003e the longest native focal length and largest aperture in the TOA refractor line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-inch dual-speed rack-and-pinion focuser with camera angle adjuster included:\u003c\/strong\u003e built for the load of a full medium-format or heavy imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e275 mm back focus at prime focus:\u003c\/strong\u003e published by Takahashi for the native configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield:\u003c\/strong\u003e tube length runs from 1110 mm to 1270 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 at this aperture.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-150B objective is a highly air-spaced triplet using two S-FPL53 ED elements, the same design family as the TOA-130 series scaled up to a 150 mm aperture and a longer 1100 mm focal length. At f\/7.3, the design favors resolving power and light grasp — the largest of any TOA refractor — over imaging speed, with hard multicoated optics and knife-edged baffles built for high-contrast planetary and lunar work as much as deep-sky imaging. It accepts the same TOA-series correctors as the smaller TOA-130 models: the TOA-35FL field corrector runs 1080 mm at f\/7.2 with a 40 mm image circle and 117.5 mm back focus, the TOA-645FL flattener runs 1085 mm at f\/7.2 with a 60 mm image circle and 56.2 mm back focus for medium-format sensors, and the TOA-35RD 0.7x reducer drops the system to 775 mm at f\/5.2 with a 44 mm image circle and 62.5 mm back focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eHigh-resolution visual observation of planets, the Moon and double stars at the largest aperture Takahashi's refractor line offers; tight-framing deep-sky and planetary astrophotography; medium-format imaging with the TOA-645FL flattener; observatory installations on a pier or mount rated well above the 14.5 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 275 mm. Adding the TOA-35FL corrector changes that to 117.5 mm at f\/7.2; the TOA-645FL flattener changes it to 56.2 mm at f\/7.2 with a 60 mm image circle for medium-format cameras; and the TOA-35RD reducer changes it to 62.5 mm at f\/5.2. Each accessory resets both the focal ratio and the spacing your imaging train needs to hit, and the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists all three configurations — send us your camera and filter setup and we will confirm the fit with you. Takahashi's own listing notes the tube ships with a CAA (camera angle adjuster), 31.7 mm and 50.8 mm couplings and adapters, and an extension tube included with the optical tube assembly.\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 from the pier or GEM you'll need:\u003c\/strong\u003e at 14.5 kg published weight, this tube asks for a mount and pier with real payload margin, not a portable travel setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eImaging performance depends on the matched corrector:\u003c\/strong\u003e the bare optical tube favors visual use and longer-focal-length imaging; the TOA-35FL, TOA-645FL, or TOA-35RD is what flattens the field for most deep-sky imaging trains.\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, though its size and weight mean handling and mounting it takes more care than a smaller apochromat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigh-resolution planetary and lunar visual observation and tight-framing deep-sky astrophotography, both benefiting from the largest aperture in Takahashi's TOA line.\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, TOA-645FL, or TOA-35RD, matched to the back focus your camera train needs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat mounts is it suited to?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA large German equatorial mount or observatory pier rated comfortably above the 14.5 kg published tube weight once a full imaging or visual accessory load is added.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the TOA-130NS and TOA-130NFB?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt steps up to a 150 mm aperture and a longer 1100 mm focal length, against 130 mm and 1000 mm on the NS and NFB, with a correspondingly heavier 14.5 kg tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 150 mm f\/7.3 ED apochromatic triplet, the largest refractor in Takahashi's TOA line, built for high-resolution visual work and flat-field imaging on a mount rated for its 14.5 kg tube weight.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047053316207,"sku":"TAK-TOK15110","price":18690.1,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TOK15110_TOA-150B_1.jpg?v=1786911842"},{"product_id":"takahashi-foa-60-60mm-f-8-8-ortho-apochromatic-refractor-ota","title":"Takahashi FOA-60 60mm f\/8.8 Ortho Apochromatic Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FOA-60 is Takahashi's Ortho Apochromat — a 60 mm fluorite doublet built for correction quality rather than field width, with a published Strehl ratio in excess of 96%, a figure normally associated with Takahashi's larger TOA series. At 530 mm focal length and f\/8.8 it is a slower, more deliberate design than the FS-60 line, in a retractable-dew-shield tube that weighs 1.8 kg.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if what you want from a 60 mm refractor is correction quality — tight, well-controlled stars for lunar and planetary detail and demanding double-star splits — rather than the widest possible field. It suits observers and imagers who already own a wide-field instrument and want a second, high-precision tube for close work, and anyone who wants a compact travel scope that performs like a considerably larger apochromat on the moon and planets.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrtho Apochromat design:\u003c\/strong\u003e a two-element air-spaced fluorite doublet optimized for correction over field width — a published Strehl ratio above 96%.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e530 mm at f\/8.8:\u003c\/strong\u003e 60 mm aperture in a compact 500 mm tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e175.5 mm of back focus:\u003c\/strong\u003e ample working distance for a diagonal or camera train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield:\u003c\/strong\u003e extends to 80 mm over a slim 68 mm tube for transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e84 mm drawtube extension\u003c\/strong\u003e on a rack-and-pinion focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpgrade path:\u003c\/strong\u003e the 1.7x EX extender converts it to the FOA-60Q configuration — 900 mm at f\/15 with a 44 mm image circle.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FOA-60 uses the same two-element, air-spaced fluorite doublet family as the rest of the FS\/FC line, but Takahashi has specified and figured it as an Ortho Apochromat — a design tier aimed at the correction levels normally reserved for the TOA triplets. The published Strehl ratio, in excess of 96% at prime focus and over 99% with the 1.7x extender fitted, describes how closely the wavefront approaches a theoretically perfect optic; in practice it shows up as tighter Airy disks and cleaner diffraction rings on planets and double stars than a standard doublet at this aperture delivers.\u003c\/p\u003e\u003cp\u003eHard multicoatings protect the fluorite element, and the 175.5 mm of back focus — generous for a 60 mm scope — is what leaves room for the FL 0.93x flattener or the EX 1.7xR extender to reach focus without running out of drawtube travel.\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 at 530 mm and f\/8.8, or extended to 900 mm and f\/15 with the EX 1.7xR extender.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-star splitting:\u003c\/strong\u003e the high Strehl ratio is most visible on close, even-magnitude pairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact travel observing:\u003c\/strong\u003e a 500 mm tube and 1.8 kg weight that packs down with the retractable dew shield.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field imaging:\u003c\/strong\u003e with the FL 0.93x flattener, 495 mm at f\/8.2 across a 44 mm circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-resolution planetary imaging:\u003c\/strong\u003e with the EX 1.7xR extender, 900 mm at f\/15 across an 88 mm circle — the FOA-60Q configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FOA-60's system chart and extender chart, both in the Downloads tab, list the exact adapters and distances for the flattener and extender configurations. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole Takahashi range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 175.5 mm at prime focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e FL 0.93x — 495 mm, f\/8.2, 44 mm circle, 56.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtender:\u003c\/strong\u003e EX 1.7xR — converts the tube to the FOA-60Q configuration, 900 mm, f\/15, 88 mm circle, 208.1 mm back focus. The extender has its own system chart, included below.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included. At 1.8 kg it suits small to mid-sized equatorial and travel mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you already own the EX 1.7xR extender or are considering it, send us your camera and filter setup and we will confirm the back focus with you.\u003c\/p\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, tripod, rings, dovetail, diagonal, eyepiece and finder are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field for imaging needs the FL 0.93x flattener.\u003c\/strong\u003e At prime focus the field curves, as on any doublet refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60 mm still sets the light grasp.\u003c\/strong\u003e The Ortho design improves correction, not aperture — its strength is image quality on bright, small targets rather than reach on faint deep-sky objects.\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 — at prime focus it is a diagonal and eyepiece and you are observing. The flattener and extender configurations are documented on Takahashi's system charts in the Downloads tab, which list the parts and distances.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLunar and planetary observing, double-star splitting, and high-resolution imaging once extended to the FOA-60Q configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does Ortho Apochromat mean, and how is this different from the FS-60CB?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is a correction-focused design tier — a published Strehl ratio above 96% versus a standard doublet's typical figures — aimed at planetary and double-star performance rather than the FS-60CB's wide-field flexibility.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this become a FOA-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — fitting the EX 1.7xR extender converts it to the FOA-60Q's 900 mm f\/15 configuration with an 88 mm image circle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor a flat field to the edge of frame, yes — the FL 0.93x flattener corrects the native field curvature.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 60 mm fluorite Ortho Apochromat at 530 mm and f\/8.8, with a Strehl ratio above 96%, 175.5 mm of back focus, and an upgrade path to 900 mm f\/15 with the EX 1.7xR extender.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047053545583,"sku":"TAK-TFA06010","price":1816.1,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TFA06010_FOA-60_OTA_1.jpg?v=1786911866"},{"product_id":"takahashi-fc-100df-f-7-4-steinheil-fluorite-doublet-apo-refractor-ota-imaging-model","title":"Takahashi FC-100DF f\/7.4 Steinheil Fluorite Doublet APO Refractor OTA — Imaging Model","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-100DF is Takahashi's 100 mm Steinheil fluorite doublet apochromat in its imaging configuration — the same optical formula as the FC-100DC, built into a shorter 785 mm tube with a 2.7-inch focuser sized for camera loads. At 740 mm focal length and f\/7.4 it weighs 3.3 kg, with 223 mm of back focus at prime giving an imaging train real room to work with.\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 100 mm apochromat built for a camera train from the start — the imaging-length tube and larger focuser distinguish it from the visual-oriented FC-100DC. It suits deep-sky imagers working at moderate focal length, and it reduces to 480 mm at f\/4.8 with the FC-35RD reducer for a wider field, or flattens to 760 mm at f\/7.6 with the FC\/FS MFL 1.04x for full-frame coverage.\u003c\/p\u003e\u003cp\u003eVisual observers get a genuinely apochromatic 100 mm refractor with clean colour correction, though the shorter DC is the lighter choice if imaging is not the goal. Tell us your camera and sensor size and we will confirm which reducer or flattener fits your frame.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteinheil fluorite doublet:\u003c\/strong\u003e two elements in two groups, with hard multicoatings on the fluorite surfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e740 mm at f\/7.4:\u003c\/strong\u003e in a 785 mm tube, 95 mm across (124 mm dew shield) — built for the imaging-length back focus this focal ratio needs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.7-inch rack-and-pinion focuser:\u003c\/strong\u003e sized for the added weight of a camera, filter wheel and off-axis guider.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e223 mm of back focus\u003c\/strong\u003e at prime focus — generous room for a full imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.3 kg:\u003c\/strong\u003e heavier than the FC-100DC's visual configuration, reflecting the longer tube and larger focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e63 mm of drawtube extension\u003c\/strong\u003e for fine focus travel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective is a two-element air-spaced fluorite doublet in the Steinheil configuration, sharing its optical prescription with the visual-oriented FC-100DC. Fluorite's anomalous partial dispersion pulls the red, green and blue focal points close enough together that secondary spectrum is not the limiting factor at 100 mm, and hard multicoatings protect the softer fluorite surfaces from moisture and handling.\u003c\/p\u003e\u003cp\u003eWhat separates the DF from the DC is mechanical, not optical: a shorter 785 mm tube paired with a 2.7-inch focuser rather than the DC's visual-oriented mount, giving the imaging train more rigidity under camera weight. The FC\/FS MFL 1.04x flattener brings the system to 760 mm at f\/7.6 with a 44 mm corrected circle at 71.2 mm back focus, and the FC-35RD 0.66x reducer shortens it to 480 mm at f\/4.8, also with a 44 mm circle, at 74.1 mm back focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky imaging at native focal length:\u003c\/strong\u003e 740 mm and f\/7.4 for medium-sized targets — galaxies, planetary nebulae, tighter framing on emission nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field imaging:\u003c\/strong\u003e with the FC-35RD 0.66x reducer at 480 mm and f\/4.8, a 44 mm corrected circle for larger nebulae and star fields.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field full-frame imaging:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 760 mm and f\/7.6.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e lunar, planetary and double-star work with a diagonal and eyepiece, though the DC is the lighter-weight choice for visual-only use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus at prime is 223 mm, dropping to 71.2 mm with the MFL 1.04x flattener or 74.1 mm with the FC-35RD reducer — each conversion changes the spacing your imaging train needs to hit. Takahashi's own system charts for the base configuration, the FC-35RD reducer, the EX-Q 1.6x extender and the EX-C2X extender are in the Downloads tab, with the parts and distances for each. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range in one table.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlattener:\u003c\/strong\u003e FC\/FS MFL 1.04x, 760 mm at f\/7.6, 44 mm circle, 71.2 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReducer:\u003c\/strong\u003e FC-35RD 0.66x, 480 mm at f\/4.8, 44 mm circle, 74.1 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtenders:\u003c\/strong\u003e EX-Q 1.6x and EX-C2X extend the focal length further for planetary and lunar imaging — system charts for both are in the Downloads tab.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings, dovetail, diagonal or eyepiece included. At 3.3 kg plus a full imaging train, a mount rated for 8–10 kg of total payload is a reasonable starting point.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure which reducer or flattener matches your sensor, send us your camera and filter setup and we will work it out with you.\u003c\/p\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, eyepiece and finder are all sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field needs a corrector.\u003c\/strong\u003e At prime focus the field curves; the MFL 1.04x flattener corrects it across 44 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus changes with every conversion lens.\u003c\/strong\u003e 223 mm at prime, 71.2 mm with the flattener, 74.1 mm with the reducer — the system charts in the Downloads tab list the exact parts for each.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite needs ordinary care.\u003c\/strong\u003e The hard multicoatings protect it; standard optical cleaning practice is what it asks for.\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. At prime focus with a diagonal and eyepiece it is straightforward visual use. Imaging trains take more care because the spacing changes with each conversion lens, and the published system charts name the exact parts and distances — send us your camera and we will confirm the train with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky imaging at 740 mm native, or wider at 480 mm with the FC-35RD reducer. The larger focuser and imaging-length tube distinguish it from the visual-oriented FC-100DC.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the FC-100DC?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame optical formula, different mechanics. The DF has a shorter 785 mm tube and a 2.7-inch focuser built for camera loads; the DC is the visual-oriented configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor a flat field across an APS-C or full-frame sensor, yes — the MFL 1.04x flattener corrects the field curvature that shows at prime focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat mount does it need?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt 3.3 kg before accessories, most mid-weight imaging mounts handle it once a full imaging train is added. Tell us your setup and we will confirm the total payload.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this not be the choice?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor visual-only use where the extra focuser weight and imaging-length tube add nothing — the FC-100DC covers that use case at a lighter weight.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 100 mm fluorite doublet apochromat built for imaging, at 740 mm and f\/7.4 with 223 mm of back focus, reducing to 480 mm at f\/4.8 or flattening to 760 mm at f\/7.6 depending on the conversion lens fitted. It weighs 3.3 kg and pairs a 2.7-inch focuser with published system charts for every configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Diagram Reports\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes a spot diagram for the FC-100D optical design at prime focus, showing star images across the field at the design wavelengths.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FC-100DF_spots.png?v=1786911643\" alt=\"Takahashi FC-100D series 100mm fluorite doublet spot diagram at prime focus\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047053578351,"sku":"TAK-TFK10110","price":3289.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TFK10110_FC-100DF_OTA_1.jpg?v=1786911885"},{"product_id":"takahashi-fc-76dcu-76mm-f-7-5-fluorite-doublet-refractor-ota","title":"Takahashi FC-76DCU 76mm f\/7.5 Fluorite Doublet Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DCU is Takahashi's 76 mm fluorite doublet apochromat — a step up in aperture from the FS-60 line, in a tube with a fixed 80 mm barrel and a retractable dew shield that extends to 95 mm. At 570 mm focal length and f\/7.5 it runs 656 mm long and weighs 1.7 kg, and it ships with a working set of visual couplings and adapters rather than a bare tube.\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 more aperture and focal length than a 60 mm refractor offers, in a tube that still packs down for travel with its retractable dew shield. It suits visual observers who want brighter, higher-resolution views of the moon and planets than a 60 mm scope delivers, and imagers who want a mid-aperture apochromat that reduces and flattens cleanly for deep-sky framing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-spaced fluorite doublet:\u003c\/strong\u003e two elements in two groups, the same fluorite-crystal design language as the rest of Takahashi's FC\/FS range, scaled to 76 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e570 mm at f\/7.5:\u003c\/strong\u003e more aperture and reach than the FS-60 line, still a compact travel-length tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e159 mm of back focus:\u003c\/strong\u003e enough room for a diagonal, filter wheel or imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable dew shield:\u003c\/strong\u003e extends to 95 mm over an 80 mm tube, and collapses for transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30 mm drawtube extension\u003c\/strong\u003e on a rack-and-pinion focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded couplings:\u003c\/strong\u003e ships with a visual adapter, aux ring, eyepiece adapter and camera couplings — a working visual train out of the box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.7 kg:\u003c\/strong\u003e light enough for mid-sized equatorial and travel mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective is a two-element, air-spaced fluorite doublet, the same design family as the FS-60 and FS-60Q but built to a 76 mm aperture. Fluorite's anomalous partial dispersion keeps the red, green and blue focal points close enough together that the two-element design controls colour the way a more complex triplet would at this size, and hard multicoatings on the fluorite surface protect it and cut internal reflections.\u003c\/p\u003e\u003cp\u003eThe 159 mm of back focus is what makes the FC\/FS MFL 1.04x flattener and the 76D RD NC 0.85x reducer usable on this tube — both reach focus within the published spacing, turning the same objective into either a flat 590 mm f\/7.8 imaging setup or a faster 486 mm f\/6.4 wide-field configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e lunar, planetary and double-star work at 570 mm and f\/7.5, with more resolution than a 60 mm aperture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field deep-sky imaging:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 590 mm and f\/7.8, corrected to a 44 mm circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field imaging:\u003c\/strong\u003e with the 76D RD NC 0.85x reducer at 486 mm and f\/6.4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel and eclipse observing:\u003c\/strong\u003e the retractable dew shield keeps the packed length manageable.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DCU's system chart, plus its Extender-C2X and Extender-Q charts, are in the Downloads tab and list every adapter and distance for each configuration. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 159 mm at prime focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e FC\/FS MFL 1.04x — 590 mm, f\/7.8, 44 mm circle, 75.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal reducer:\u003c\/strong\u003e 76D RD NC 0.85x — 486 mm, f\/6.4, 44 mm circle, 56.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded in the box:\u003c\/strong\u003e Visual Adapter (TKP20005), Coupling L (TKP00104), Aux Ring (TKP20001), Eyepiece Adapter (TKP00101) and Coupling DT (TKP20006B) — a visual train ready to accept a 1.25-inch diagonal and eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included. At 1.7 kg it suits mid-sized equatorial and travel mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are planning an imaging train and want to confirm spacing before ordering, send us your camera and filter setup and we will work it out with you.\u003c\/p\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, tripod, rings and dovetail are sold separately, though the visual couplings needed for an eyepiece are included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field for imaging needs the flattener or reducer.\u003c\/strong\u003e At prime focus the field curves, as on any doublet refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe FURD 0.64x reducer is built for the longer-tube FC-76DP, not this one.\u003c\/strong\u003e The DCU uses the 76D RD NC 0.85x reducer instead.\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 ships with the visual couplings needed for a diagonal and eyepiece, and the system chart in the Downloads tab lists every part and distance for imaging configurations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eVisual observing of the moon and planets at 76 mm aperture, and deep-sky imaging once the flattener or reducer is fitted.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FC-76DCU and FC-76DP?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame 76 mm objective and 570 mm native focal length, different tube. The DCU has a shorter, retractable-dew-shield tube at 159 mm back focus; the DP is a longer fixed tube with 207.1 mm of back focus for its own dedicated FURD reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt prime focus, yes, for a flat field to the edge — the MFL 1.04x flattener or the 0.85x reducer each correct it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the box besides the tube?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA visual adapter, aux ring, eyepiece adapter and two couplings — enough to attach a 1.25-inch diagonal and eyepiece without buying additional adapters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 76 mm fluorite doublet apochromat at 570 mm and f\/7.5, with 159 mm of back focus, a retractable dew shield, and the couplings needed for visual use included — ready to flatten or reduce for imaging when you add the matching corrector.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047053971567,"sku":"TAK-TFK07640","price":1859.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TFK07640_FC-76DCU_OTA_1.jpg?v=1786911918"},{"product_id":"takahashi-fc-100dz-100mm-f-8-fluorite-doublet-refractor-ota","title":"Takahashi FC-100DZ 100mm f\/8 Fluorite Doublet Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-100DZ is Takahashi's 100 mm fluorite doublet apochromat, the newest member of the FC-100D family. At 800 mm focal length and f\/8, it retracts to 770 mm and extends to 840 mm through a variable-length dew shield and tube assembly, weighing 3.7 kg. Back focus at prime is 225 mm, and the doublet uses a fluorite element paired with high-index, low-dispersion glass rather than the Steinheil pairing of the DC and DF.\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 the latest revision of Takahashi's 100 mm fluorite doublet line, with reduced blue halo compared to the FC-100D and compatibility with the existing FC-100 accessory range — flatteners, reducers and adapters already built for the DC and DF fit here too. It suits visual observers after clean, high-contrast lunar and planetary views, and imagers who reduce to 530 mm at f\/5.3 with the FC-35RD for wider framing.\u003c\/p\u003e\u003cp\u003eTell us your camera and sensor size and we will confirm which reducer or flattener gets you the field you want.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite doublet, refined design:\u003c\/strong\u003e two elements in two groups, pairing fluorite with high-index, low-dispersion glass for reduced blue halo relative to the FC-100D.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e800 mm at f\/8:\u003c\/strong\u003e in a 770–840 mm variable-length tube, 95 mm across (124 mm dew shield).\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2.7-inch rack-and-pinion focuser, single-speed.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e225 mm of back focus\u003c\/strong\u003e at prime focus — ample room for a full imaging or visual train.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e63 mm of drawtube extension.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with existing FC-100 accessories:\u003c\/strong\u003e the same flatteners, reducers and adapters built for the FC-100DC and FC-100DF fit this tube.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective pairs a fluorite element with a high-index, low-dispersion glass element in a two-element air-spaced doublet — a refinement over the Steinheil FC-100DC\/DF pairing that Takahashi states cuts blue halo by roughly half. In practice that means tighter colour correction at the same 100 mm aperture and f\/8 focal ratio, with the retractable dew shield collapsing the 840 mm tube to 770 mm for transport.\u003c\/p\u003e\u003cp\u003eThe FC\/FS MFL 1.04x flattener brings the system to 820 mm at f\/8.2 with a 44 mm corrected circle at 71.2 mm back focus, and the FC-35RD 0.66x reducer shortens it to 530 mm at f\/5.3, also 44 mm, at 68.8 mm back focus — the same conversion lenses used across the FC-100D family.\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 at 800 mm and f\/8, with reduced chromatic error over the earlier FC-100D.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky imaging at native focal length:\u003c\/strong\u003e 800 mm for medium-sized targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field imaging:\u003c\/strong\u003e with the FC-35RD 0.66x reducer at 530 mm and f\/5.3, a 44 mm corrected circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field imaging:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 820 mm and f\/8.2.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus at prime is 225 mm, dropping to 71.2 mm with the MFL 1.04x flattener or 68.8 mm with the FC-35RD reducer. Because the FC-100DZ shares its rear cell with the DC and DF, existing FC-100 flatteners, reducers and adapters fit directly. Takahashi's system charts for the base configuration, the FC-35RD reducer and the EX-Q 1.6x extender are in the Downloads tab, and our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlattener:\u003c\/strong\u003e FC\/FS MFL 1.04x, 820 mm at f\/8.2, 44 mm circle, 71.2 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReducer:\u003c\/strong\u003e FC-35RD 0.66x, 530 mm at f\/5.3, 44 mm circle, 68.8 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtender:\u003c\/strong\u003e EX-Q 1.6x extends the focal length for planetary and lunar imaging — system chart in the Downloads tab.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings, dovetail, diagonal or eyepiece included. At 3.7 kg plus accessories, a mount rated for 8–10 kg of total payload is a reasonable starting point.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you already own FC-100DC or FC-100DF accessories and are not sure they carry over, send us the part numbers and we will confirm.\u003c\/p\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, eyepiece and finder are all sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field needs a corrector.\u003c\/strong\u003e At prime focus the field curves; the MFL 1.04x flattener corrects it across 44 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus changes with each conversion lens.\u003c\/strong\u003e 225 mm at prime, 71.2 mm with the flattener, 68.8 mm with the reducer — the system charts in the Downloads tab list the exact parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe tube length varies with the dew shield position.\u003c\/strong\u003e 770 mm retracted, 840 mm extended — worth accounting for in a case or travel bag.\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. At prime focus with a diagonal and eyepiece it is straightforward. Imaging trains take more care because spacing changes with each conversion lens, and the published system charts name the exact parts — send us your camera and we will confirm the train with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLunar and planetary observing with reduced chromatic error, and deep-sky imaging at 800 mm native or wider with the FC-35RD reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the FC-100DC and FC-100DF?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA refined optical prescription — fluorite paired with high-index, low-dispersion glass rather than the Steinheil pairing — with roughly half the blue halo of the FC-100D, while remaining compatible with the same accessory range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo existing FC-100 accessories fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — the flatteners, reducers and adapters built for the FC-100DC and FC-100DF fit the FC-100DZ's rear cell directly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat mount does it need?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt 3.7 kg before accessories, most mid-weight mounts handle it once a diagonal or camera is added. Tell us your setup and we will confirm the total payload.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this not be the choice?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFor wide-field imaging without a reducer — native f\/8 is a long native ratio for large nebulae, though the FC-35RD reducer addresses that at 530 mm and f\/5.3.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 100 mm fluorite doublet apochromat at 800 mm and f\/8, with 225 mm of back focus at prime and 63 mm of drawtube extension, weighing 3.7 kg. It reduces to 530 mm at f\/5.3 or flattens to 820 mm at f\/8.2 depending on the conversion lens, and it shares its accessory range with the rest of the FC-100D family.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Diagram Reports\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes a spot diagram for the FC-100DZ at prime focus, showing star images across the field at the design wavelengths.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FC-100DZ_spots.png?v=1786911643\" alt=\"Takahashi FC-100DZ 100mm fluorite doublet spot diagram at prime focus\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047054004335,"sku":"TAK-TFK10310","price":4418.7,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TFK10310_FC-100DZ_1.jpg?v=1786911938"},{"product_id":"takahashi-fc-76dp-76mm-f-7-5-fluorite-doublet-refractor-ota","title":"Takahashi FC-76DP 76mm f\/7.5 Fluorite Doublet Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DP is the fixed-tube, long-backfocus version of Takahashi's 76 mm fluorite doublet apochromat — the same objective as the FC-76DCU, in a longer 95 mm-diameter tube built for reducer-based astrophotography. At 570 mm focal length and f\/7.5 it shares the DCU's native optics, but its 207.1 mm of back focus at prime focus — close to 50 mm more than the DCU — is what lets it run the dedicated 76DP FURD 0.64x reducer without running out of drawtube travel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you already know you want a permanent 76 mm imaging platform built around the FU reducer, rather than a travel tube you reconfigure between sessions. It suits imagers assembling a fixed rig around the 365 mm f\/4.8 fast configuration the FURD reducer gives, and anyone who does not need the DCU's retractable dew shield for portability.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-spaced fluorite doublet:\u003c\/strong\u003e the same two-element, two-group 76 mm objective used in the FC-76DCU.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e570 mm at f\/7.5:\u003c\/strong\u003e native prime-focus figures identical to the DCU.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e207.1 mm of back focus:\u003c\/strong\u003e a fixed 95 mm tube gives substantially more rear clearance than the DCU's 159 mm, built for FU reducer use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e63 mm drawtube extension\u003c\/strong\u003e on a rack-and-pinion focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.3 kg:\u003c\/strong\u003e heavier than the DCU by the length of tube, still manageable for mid-sized mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe objective is the same two-element, air-spaced fluorite doublet used in the FC-76DCU — fluorite's anomalous partial dispersion gives this doublet the colour correction of a more complex design at 76 mm aperture, protected by Takahashi's hard multicoatings.\u003c\/p\u003e\u003cp\u003eWhat sets the DP apart is tube length rather than glass. The fixed 95 mm barrel extends the back focus to 207.1 mm at prime focus, which is what makes room for the 76DP FURD 0.64x reducer — a part built for this tube's back focus and not interchangeable with the DCU's 0.85x reducer. With it fitted, the same objective runs at 365 mm and f\/4.8, a materially faster system for deep-sky imaging than the native f\/7.5.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast deep-sky imaging:\u003c\/strong\u003e with the 76DP FURD 0.64x reducer at 365 mm and f\/4.8.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat-field imaging at prime focus:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 590 mm and f\/7.8, corrected to a 44 mm circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced-field imaging:\u003c\/strong\u003e with the 76D RD NC 0.85x reducer at 486 mm and f\/6.4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing:\u003c\/strong\u003e lunar and planetary work at 570 mm and f\/7.5 with a diagonal and eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DCU and FC-76DP share the same objective and the flattener and 0.85x reducer, but the 76DP FURD 0.64x reducer is built specifically for this tube's 207.1 mm back focus. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e lists the figures for both tubes side by side.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 207.1 mm at prime focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e FC\/FS MFL 1.04x — 590 mm, f\/7.8, 44 mm circle, 75.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal reducer:\u003c\/strong\u003e 76D RD NC 0.85x — 486 mm, f\/6.4, 44 mm circle, 56.0 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFU reducer:\u003c\/strong\u003e 76DP FURD 0.64x — 365 mm, f\/4.8, 44 mm circle, 56.0 mm back focus measured from the rear of the adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure which reducer your camera needs, send us your camera and filter setup and we will work it out with you.\u003c\/p\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, tripod, rings, dovetail, diagonal, eyepiece and finder are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe DP's FU reducer is model-specific.\u003c\/strong\u003e The 76DP FURD 0.64x is built for this tube's back focus and is a different part from the DCU's reducer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field needs a corrector.\u003c\/strong\u003e At prime focus the field curves; the flattener or reducer corrects it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo fixed dew shield extension.\u003c\/strong\u003e Unlike the DCU, the DP's dew shield diameter matches the tube diameter rather than retracting further — the tube is longer overall as a result.\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 — at prime focus it is a diagonal and eyepiece, or a camera and the appropriate spacer for your chosen reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FC-76DCU and FC-76DP?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame 76 mm objective and 570 mm native focal length, different tube. The DP's fixed 95 mm barrel gives 207.1 mm of back focus against the DCU's 159 mm, and that extra room is what the FURD reducer needs to reach focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFast deep-sky imaging with the FURD 0.64x reducer, where the extra back focus over the DCU matters most.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need a flattener for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt prime focus, yes, for a flat field to the edge — the MFL 1.04x flattener or the reducers each correct it differently.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use FC-76DCU accessories on this tube?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe flattener and 0.85x reducer are shared. The FURD reducer is specific to the DP's back focus and is a separate part from the DCU's reducer.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 76 mm fluorite apochromat at 570 mm and f\/7.5, built into a fixed 95 mm tube with 207.1 mm of back focus for reducer and flattener work — and a 365 mm f\/4.8 fast astrograph once the FURD reducer is attached.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047054757999,"sku":"TAK-TFA06000","price":2130.7,"currency_code":"CAD","in_stock":false}]},{"product_id":"takahashi-foa-60q-60mm-f-15-ortho-apochromatic-refractor-ota","title":"Takahashi FOA-60Q 60mm f\/15 Ortho Apochromatic Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FOA-60Q is the FOA-60's Ortho Apochromat objective with the 1.7x EX extender built permanently into the optical path — a 6-element, 4-group design running natively at 900 mm and f\/15, with an 88 mm corrected image circle. Takahashi publishes a theoretical Strehl ratio of 99.8% for this configuration, a figure the company states exceeds its own TOA-130 and TOA-150 triplets. The tube weighs 2.1 kg and extends to 707 mm.\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 the FOA-60's correction quality at long focal length without assembling the extender yourself — planetary and lunar observers chasing fine detail at high power, and double-star observers splitting close, faint pairs where wavefront quality matters as much as aperture. It suits imagers doing high-resolution planetary and lunar work who want a compact, dedicated long-focal-length apochromat rather than a general-purpose wide-field tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrtho Apochromat with built-in extender:\u003c\/strong\u003e six elements in four groups — the FOA-60 doublet plus a permanently mounted 1.7x extender group.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e900 mm at f\/15:\u003c\/strong\u003e native focal length and ratio, with an 88 mm corrected image circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e99.8% theoretical Strehl ratio,\u003c\/strong\u003e per Takahashi — correction Takahashi states exceeds its TOA-130 and TOA-150 triplets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e208.1 mm of back focus:\u003c\/strong\u003e ample room for a diagonal or imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e84 mm drawtube extension\u003c\/strong\u003e on a rack-and-pinion focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.1 kg:\u003c\/strong\u003e compact for the focal length, in a tube that extends to 707 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe front two elements are the FOA-60's Ortho Apochromat fluorite doublet — already specified for correction levels associated with Takahashi's TOA triplets — with a four-element 1.7x extender group permanently mated behind it, rather than sold as a separate accessory. The combination is what produces the published 99.8% theoretical Strehl ratio, and Takahashi's own comparison places that figure above the TOA-130 and TOA-150.\u003c\/p\u003e\u003cp\u003eHard multicoatings protect the fluorite surfaces, and the 208.1 mm of back focus — generous for a 60 mm-aperture tube — is what makes room for a diagonal, filter wheel or high-resolution planetary camera without running short on drawtube travel. Because the extender is integrated rather than an add-on, there is no shorter native configuration on this tube — removing the extender group returns it to a standard FOA-60.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-power planetary and lunar observing:\u003c\/strong\u003e at 900 mm and f\/15, where the high Strehl ratio shows up as tighter, cleaner diffraction detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClose double-star splitting:\u003c\/strong\u003e correction quality matters as much as aperture for faint, tight pairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-resolution planetary imaging:\u003c\/strong\u003e the long native focal length suits lucky-imaging style planetary cameras without an additional Barlow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact long-focal-length visual work:\u003c\/strong\u003e 900 mm in a tube that still travels, at 2.1 kg.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FOA-60Q's system chart and extender-specific chart, both in the Downloads tab, list the adapters and distances Takahashi publishes for this configuration. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole Takahashi range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 208.1 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage circle:\u003c\/strong\u003e 88 mm, corrected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual train:\u003c\/strong\u003e a 1.25-inch or 2-inch diagonal and eyepiece attach through the matching Takahashi visual adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings, finder or dovetail included. At 2.1 kg it suits small to mid-sized equatorial mounts, though 900 mm of focal length asks more of tracking accuracy than a wide-field scope.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are planning a planetary imaging train and want to confirm your camera's back focus, send us the details and we will work it out with you.\u003c\/p\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, tripod, rings, dovetail, diagonal, eyepiece and finder are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe extender is built in, not removable as a separate accessory purchase.\u003c\/strong\u003e There is no shorter native configuration on this specific tube listing — for that, the FOA-60 without the extender is the base model.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60 mm still sets the light grasp.\u003c\/strong\u003e The Ortho design and extender improve correction and reach, not aperture — its strength is planetary and double-star detail rather than faint deep-sky targets.\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 — at prime focus it is a diagonal and eyepiece and you are observing. The system chart in the Downloads tab lists the adapters and distances for imaging.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigh-power lunar and planetary observing and imaging, and close double-star splitting, where the 99.8% theoretical Strehl ratio is most visible.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the FOA-60 and FOA-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FOA-60Q has the 1.7x extender permanently built into the optical path — 900 mm at f\/15 instead of the FOA-60's native 530 mm at f\/8.8 — rather than being added as a separate accessory.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need additional accessories for imaging?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe 88 mm image circle and 208.1 mm of back focus are already corrected for this configuration; a planetary or lunar camera attaches through the standard visual train without an additional flattener.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on a small mount?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt 2.1 kg the tube is light, but 900 mm of focal length benefits from steady tracking. Tell us which mount you are using and we will confirm the fit.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 60 mm fluorite Ortho Apochromat running natively at 900 mm and f\/15, with an 88 mm image circle, 208.1 mm of back focus, and a published 99.8% theoretical Strehl ratio built for high-resolution planetary and lunar work.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047056986223,"sku":"TAK-TFA06110","price":2373.8,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TFA06110_FOA-60Q_OTA_1.jpg?v=1786912003"},{"product_id":"takahashi-fsq-85edx-babyq-85mm-f-5-3-petzval-astrograph-ota-with-1-01x-flattener","title":"Takahashi FSQ-85EDX BabyQ 85mm f\/5.3 Petzval Astrograph OTA with 1.01x Flattener","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-85EDX — known as the BabyQ — is Takahashi's 85 mm Petzval quadruplet astrograph, sold here as an optical tube assembly bundled with the 1.01x flattener. At 450 mm focal length and f\/5.3 in a 535–613 mm tube, it weighs 3.6 kg and covers a 44 mm image circle. With the included flattener fitted the system runs 455 mm at f\/5.4 with just 56.2 mm of back focus, which is what makes the flattener worth bundling rather than buying separately.\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 small, genuinely flat-field quadruplet for wide-field deep-sky imaging — four elements in four groups control field curvature and colour across the full 44 mm circle without the compromises a doublet or triplet design makes at this speed. Its 3.6 kg weight and 535 mm collapsed length make it a strong travel astrograph, and the 50 mm drawtube extension gives the focuser room to work with different camera and filter-wheel combinations.\u003c\/p\u003e\u003cp\u003eVisual observers get a genuine apochromat at prime focus with a diagonal and eyepiece, though the FSQ-85EDX is built and priced around imaging. Tell us your camera and filter setup and we will confirm the flattener spacing works for your train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePetzval quadruplet:\u003c\/strong\u003e four elements in four groups, an ED apochromat design built to control field curvature and colour across a flat field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e450 mm at f\/5.3:\u003c\/strong\u003e in a 535–613 mm retractable tube, 95 mm across (114 mm dew shield).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.01x flattener included:\u003c\/strong\u003e 455 mm at f\/5.4, 44 mm corrected circle, 56.2 mm back focus — the configuration this kit is built around.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.6 kg:\u003c\/strong\u003e light enough for portable and travel mounts once a full imaging train is attached.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50 mm of drawtube extension\u003c\/strong\u003e for focus travel across different camera setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e197.5 mm of back focus at prime\u003c\/strong\u003e — before the flattener is fitted, ample room for accessories.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-85EDX objective is a four-element, four-group Petzval quadruplet built around ED glass — a design that inherently controls field curvature better than a doublet or triplet at the same speed, because the rear element group does the flattening work a separate corrector would otherwise need to do. The bundled 1.01x flattener refines that further, correcting the field to 44 mm at 455 mm and f\/5.4 with 56.2 mm of back focus — tight enough that camera spacing needs to be accurate, and generous enough that most imaging trains reach it without extension tubes.\u003c\/p\u003e\u003cp\u003eOther conversion options exist for the FSQ-85EDX platform — the RD QB 0.73x reducer brings it to 330 mm at f\/3.9, and the EX ED 1.5x extender to 680 mm at f\/8.0, both with the same 44 mm circle — though this kit is built and priced around the OTA-plus-flattener configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field deep-sky imaging:\u003c\/strong\u003e at 455 mm and f\/5.4 with the included flattener, a 44 mm corrected circle across the frame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel astrophotography:\u003c\/strong\u003e a 535 mm collapsed tube and 3.6 kg weight suit portable rigs and checked baggage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaster, wider framing:\u003c\/strong\u003e with the RD QB 0.73x reducer (sold separately) at 330 mm and f\/3.9.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTighter framing:\u003c\/strong\u003e with the EX ED 1.5x extender (sold separately) at 680 mm and f\/8.0.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus is 197.5 mm at prime, dropping to 56.2 mm once the included 1.01x flattener is fitted — the figure your imaging train needs to hit. Takahashi's system charts for the base configuration, the RD QE 0.73x reducer and the EX ED 1.5x extender are in the Downloads tab, with the exact parts and distances for each. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range in one table.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlattener:\u003c\/strong\u003e 1.01x, included in this kit — 455 mm at f\/5.4, 44 mm circle, 56.2 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReducer:\u003c\/strong\u003e RD QB 0.73x (sold separately), 330 mm at f\/3.9, 44 mm circle, 72.2 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtender:\u003c\/strong\u003e EX ED 1.5x (sold separately), 680 mm at f\/8.0, 44 mm circle, 117.5 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA with flattener — no mount, rings, dovetail, diagonal or eyepiece included. At 3.6 kg plus a full imaging train, most travel and mid-payload mounts handle it.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure your camera and filter thickness will reach 56.2 mm exactly, send us your imaging train and we will work out the spacing with you.\u003c\/p\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 with the flattener included.\u003c\/strong\u003e Mount, rings, dovetail, diagonal and eyepiece are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus with the flattener is tight.\u003c\/strong\u003e 56.2 mm is generous by imaging-train standards but still worth checking against your camera and filter wheel stack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe reducer and extender are sold separately.\u003c\/strong\u003e This kit bundles only the OTA and the 1.01x flattener; the RD QB 0.73x and EX ED 1.5x are additional purchases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTube length varies with the dew shield position.\u003c\/strong\u003e 535 mm retracted, 613 mm extended — worth accounting for in a case.\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. The flattener is included and matched to the tube, so reaching the 56.2 mm back focus is mostly a matter of using the standard adapter stack. The published system chart in the Downloads tab confirms the exact parts, and we can check your specific camera train against it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field deep-sky imaging — nebulae, star fields and Milky Way regions — at 455 mm and f\/5.4 across a flat 44 mm circle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the kit include everything I need to image?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt includes the OTA and the 1.01x flattener. A mount, camera, and any filter wheel or guider are separate purchases.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it visually?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, at prime focus with a diagonal and eyepiece, though the telescope and this kit are built and priced around imaging use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between this and the reducer or extender configurations?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis kit is built around the 1.01x flattener at 455 mm and f\/5.4. The RD QB 0.73x reducer (330 mm, f\/3.9) and EX ED 1.5x extender (680 mm, f\/8.0) are separate accessories for wider or tighter framing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this not be the choice?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIf you need faster than f\/5.4 without buying the reducer separately, or a longer native focal length than 450 mm offers before adding the extender.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an 85 mm Petzval quadruplet astrograph and its matched 1.01x flattener, together giving 455 mm at f\/5.4 with a 44 mm corrected circle and 56.2 mm of back focus. It weighs 3.6 kg, collapses to 535 mm for travel, and is built for wide-field deep-sky imaging.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Diagram Reports\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes a spot diagram for the FSQ-85EDX with the 1.01x flattener fitted — the configuration this kit ships in — showing star images across the field at the design wavelengths.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FSQ-85EDX_FL101X_spots.png?v=1786911643\" alt=\"Takahashi FSQ-85EDX 85mm Petzval spot diagram with 1.01x flattener\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047058559087,"sku":"TAK-TQE08541","price":4919.2,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TQE08541_FSQ-85EDX_OTA_1.jpg?v=1786912043"},{"product_id":"takahashi-fc-100dc-f-7-4-steinheil-fluorite-doublet-apo-refractor-ota-visual-model","title":"Takahashi FC-100DC f\/7.4 Steinheil Fluorite Doublet APO Refractor OTA, Visual Model","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-100DC is Takahashi's 100 mm Steinheil fluorite doublet apochromat, sold here as the Visual model — the crown element leads in this design rather than following, a configuration Takahashi has used specifically for its 100 mm fluorite refractors. At 740 mm focal length and f\/7.4 it runs 815 mm long with a 30 mm drawtube extension, and weighs 2.7 kg.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if visual observing is the main use — lunar, planetary and double-star work at 100 mm aperture, where the Steinheil doublet's colour correction and light throughput matter more than field width. It suits observers stepping up from a 60 or 76 mm apochromat who want a noticeably brighter, higher-resolution view, and anyone who wants a single well-corrected tube for the moon and planets without the added elements of a larger triplet. Takahashi also sells this objective as the FC-100DF, an imaging-oriented configuration in a different tube; this Visual model is built around eyepiece use.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteinheil fluorite doublet:\u003c\/strong\u003e two elements in two groups, with the fluorite crown element leading the light path — a Takahashi design choice specific to its 100 mm doublets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e740 mm at f\/7.4:\u003c\/strong\u003e 100 mm aperture with meaningfully more light grasp and resolution than a 60–76 mm refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e161 mm of back focus:\u003c\/strong\u003e room for a diagonal or a straightforward imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30 mm drawtube extension\u003c\/strong\u003e on a rack-and-pinion focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.7 kg:\u003c\/strong\u003e substantial but still manageable on a mid-sized equatorial mount.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eMost doublet apochromats use a Fraunhofer layout, with the ED or fluorite element behind the crown glass. Takahashi's 100 mm fluorite doublets instead use a Steinheil configuration, with the fluorite crown element in front. Combined with fluorite's anomalous partial dispersion, the arrangement is what Takahashi credits for the FC-100 series' colour correction and contrast at this aperture — clean planetary and lunar detail without the residual violet fringing that limits achromats at 100 mm.\u003c\/p\u003e\u003cp\u003eHard multicoatings protect the fluorite surfaces, and the 161 mm of back focus is enough for the FC\/FS MFL 1.04x flattener to reach focus at 760 mm and f\/7.6, correcting to a 44 mm image circle if imaging is added to the visual use this model is built around.\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 at 740 mm and f\/7.4, where the 100 mm aperture resolves finer detail than a smaller refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-star splitting:\u003c\/strong\u003e the Steinheil doublet's colour correction shows clearly on close, bright pairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCasual deep-sky visual observing:\u003c\/strong\u003e star clusters and brighter nebulae benefit from the extra aperture over a 60–76 mm scope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOccasional imaging:\u003c\/strong\u003e with the FC\/FS MFL 1.04x flattener at 760 mm and f\/7.6, for those who want to photograph the moon or planets without switching to the dedicated FC-100DF.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-100DC's system chart, plus its Extender-Q and Extender-C2X charts, are in the Downloads tab and list the adapters and distances Takahashi publishes for each configuration. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus:\u003c\/strong\u003e 161 mm at prime focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField flattener:\u003c\/strong\u003e FC\/FS MFL 1.04x — 760 mm, f\/7.6, 44 mm circle, 71.2 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings or dovetail included. At 2.7 kg it suits mid-sized equatorial mounts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelated model:\u003c\/strong\u003e the FC-100DF shares this objective in a tube built around imaging rather than visual use, with a different back focus and reducer options.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are weighing this Visual model against the imaging-oriented FC-100DF, send us how you plan to use it and we will help you choose.\u003c\/p\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, tripod, rings, dovetail, diagonal, eyepiece and finder are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is the Visual model.\u003c\/strong\u003e It is built around eyepiece use; the FC-100DF is Takahashi's dedicated imaging configuration of the same objective, in a different tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA flat field for imaging needs the MFL 1.04x flattener.\u003c\/strong\u003e At prime focus the field curves, as on any doublet refractor.\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 — at prime focus it is a diagonal and eyepiece and you are observing. The system chart in the Downloads tab lists parts and distances if you add a flattener for imaging.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eVisual observing of the moon, planets and double stars at 100 mm aperture. It can image with the MFL 1.04x flattener, but the FC-100DF is Takahashi's dedicated model for that use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between this and the FC-100DF?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSame 100 mm Steinheil fluorite doublet objective, different tube and intended use — this Visual model is built for eyepiece observing; the DF is configured for astrophotography with its own back focus and reducer options.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does Steinheil mean, and why does it matter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt describes which element leads the light path — the fluorite crown element sits in front here, rather than behind the flint element as in a Fraunhofer doublet. Takahashi uses this layout specifically on its 100 mm fluorite doublets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWith the FC\/FS MFL 1.04x flattener, yes, at 760 mm and f\/7.6 across a 44 mm corrected circle — though the FC-100DF is the model built specifically for that purpose.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 100 mm Steinheil fluorite doublet apochromat at 740 mm and f\/7.4, with 161 mm of back focus, built as a visual instrument for lunar, planetary and double-star observing.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047058591855,"sku":"TAK-TFK10010","price":2902.9,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TFK10010_FC-100DC_1.jpg?v=1786912049"},{"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"},{"product_id":"takahashi-fct-114df-114mm-f-7-triplet-apochromatic-refractor-ota","title":"Takahashi FCT-114DF 114mm f\/7 Triplet Apochromatic Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FCT-114DF is Takahashi's 114 mm fluorite triplet apochromat, working at 800 mm and f\/7. Takahashi publishes a 97.5% visual Strehl ratio for it — a figure that describes how close the focused image comes to theoretical perfection, and one very few refractors are specified against at all. It uses the same focuser assembly as the FSQ-85EDX, and the tube runs to approximately 5 kg.\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 lunar, planetary and deep-sky observing, with the option of adding a flattener or reducer for imaging later. If you already own an FSQ-85EDX, the shared focuser means the accessories you have for one will carry across to the other.\u003c\/p\u003e\u003cp\u003eAt 114 mm it sits in useful territory — enough aperture to hold high magnification on a planet, still short enough at 800 mm to frame larger deep-sky objects without a reducer.\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 in a three-element objective, which is what buys the colour correction a doublet cannot reach at this aperture and speed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e800 mm at f\/7:\u003c\/strong\u003e 114 mm of aperture at a moderate focal ratio — neither a fast astrograph nor a long planetary tube, but comfortable at both.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e97.5% visual Strehl ratio:\u003c\/strong\u003e Takahashi's published figure for the optical quality of the finished instrument.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocuser shared with the FSQ-85EDX:\u003c\/strong\u003e the same assembly, so adapters and accessories transfer between the two.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApproximately 5 kg:\u003c\/strong\u003e a manageable load for a mid-sized equatorial mount once a diagonal and eyepiece are attached.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA fluorite element in a triplet objective controls two problems at once. Chromatic error — the colour fringing that betrays a lesser refractor on a bright limb — comes down because fluorite's dispersion behaviour is something optical glass cannot imitate. Spherical aberration comes down because a third element gives the designer another surface to work with. Doing both at 114 mm and f\/7 is what the 97.5% Strehl figure is measuring.\u003c\/p\u003e\u003cp\u003eStrehl ratio is worth understanding when you see it quoted. It compares the light concentrated in the centre of a star image against what a theoretically perfect optic would deliver. Anything above 95% is generally regarded as excellent; 97.5% is a figure most manufacturers do not publish because most instruments cannot support the claim.\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 at high magnification, where colour correction and contrast show most directly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky visual observing\u003c\/strong\u003e — 114 mm gathers meaningfully more light than a 100 mm tube while staying transportable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble star work\u003c\/strong\u003e, where clean star images matter more than field width.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstrophotography with a corrector\u003c\/strong\u003e, once the right flattener or reducer is matched to your camera.\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\u003eFocuser:\u003c\/strong\u003e the same assembly as the FSQ-85EDX, so 2-inch visual adapters and camera fittings for that telescope fit this one.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrectors:\u003c\/strong\u003e Takahashi offers flatteners and reducers for its refractor range, and the right one depends on your sensor. Send us your camera and we will match it for you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an optical tube assembly. Rings, dovetail, diagonal and eyepiece are separate.\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. We can quote a complete setup if that is easier.\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\u003eAt prime focus, no — a diagonal and an eyepiece and you are observing. For imaging, send us your camera and we will work out the corrector and spacing with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLunar, planetary and double-star observing, where the 97.5% Strehl ratio and the fluorite triplet's colour correction show most clearly. It handles deep-sky visual work comfortably too.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does a 97.5% Strehl ratio actually mean?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt measures how much of a star's light lands where a perfect optic would put it. Above 95% is excellent. It is a demanding figure to publish, and most manufacturers do not quote one at all.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the FCT-114DS?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThey share aperture, focal length and focal ratio. The DF is the one Takahashi specifies as using the FSQ-85EDX focuser. If you are choosing between them, tell us how you plan to use the telescope and we will talk it through.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, with a corrector matched to your sensor. Send us your camera and we will work out the spacing with you before you order.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill my FSQ-85EDX accessories fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe focuser is the same assembly, so accessories that thread or slide into that focuser will transfer.\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, published at 97.5% Strehl and sharing its focuser with the FSQ-85EDX at around 5 kg — built for lunar, planetary and double-star observers who want colour correction and contrast at a useful aperture, with room to add imaging later.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047061278831,"sku":"TAK-TCK11420","price":5262.4,"currency_code":"CAD","in_stock":false}]}],"url":"https:\/\/ontariotelescope.com\/collections\/takahashi-refractors.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}