{"title":"Takahashi Reducers, Flatteners \u0026 Extenders","description":"\u003cp\u003eTakahashi field flatteners, focal reducers and extenders, plus the CA rings and spacer rings each one needs. A Takahashi corrector is matched to specific telescopes and a specific metal back distance — the system chart for your tube names the exact combination. Send us your telescope, camera and filter setup and we will confirm the right parts before you order.\u003c\/p\u003e","products":[{"product_id":"takahashi-fc-fs-multi-flattener-1-04x-field-flattener","title":"Takahashi FC\/FS Multi-Flattener 1.04x Field Flattener","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC\/FS Multi-Flattener 1.04x is Takahashi's universal field flattener for the FC and FS doublet refractor families. It replaces the separate model-specific flatteners Takahashi previously sold: one optic now covers the whole range, with a telescope-specific CA ring setting the correct spacing for each tube.\u003c\/p\u003e\u003cp\u003eTwo elements in one group, 40 mm long, 60 mm across and 110 g. It threads M56 x 0.75 female on the telescope side and presents M52 x 0.75 male to your camera adapter, with 40 mm of backfocus behind it. The 1.04x factor means focal length moves only slightly — a 355 mm FS-60CB becomes 370 mm — so this is a corrector, not a focal-length changer.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you image with an FC or FS doublet and your stars go elongated toward the corners of the frame. At prime focus these telescopes have a curved field; the flattener corrects it and gives a 44 mm flat circle on the shorter tubes — enough to cover APS-C completely and most of full frame.\u003c\/p\u003e\u003cp\u003eIf you observe visually with an eyepiece, this has no application in that train. It corrects a photographic field for a sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo elements in one group:\u003c\/strong\u003e a cemented pair that corrects field curvature without adding measurable chromatic error of its own.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.04x magnification factor:\u003c\/strong\u003e focal length and focal ratio shift only marginally — the point is the flat field, not a speed change.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44 mm corrected image circle\u003c\/strong\u003e on FS-60CB, FC-76D, FC-100D, FC-50, FC-65, FC-76 and FS-78; \u003cstrong\u003e40 mm\u003c\/strong\u003e on FC-100DL, FC-60, FC-100, FC-125, FS-102, FS-128 and FS-152.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM56 x 0.75 female in, M52 x 0.75 male out:\u003c\/strong\u003e standard Takahashi interfaces on both faces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 mm backfocus:\u003c\/strong\u003e the distance from the rear thread to the sensor, which your camera adapter stack must total.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e110 g and 40 mm long:\u003c\/strong\u003e adds almost nothing to focuser load or train length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne optic, whole family:\u003c\/strong\u003e replaces the older per-telescope flatteners; the CA ring does the model-specific work.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA doublet refractor focuses a curved surface, not a plane. Stars at the centre of the frame come to focus in front of the stars at the corners, so a flat sensor cannot record both sharply at once — which is why uncorrected short refractors show round stars in the middle and elongated ones at the edges.\u003c\/p\u003e\u003cp\u003eThe MFL 1.04x introduces the opposite curvature. Two elements in a single group bend the focal surface flat across the working circle while adding only 4% to the focal length. Because it is a corrector rather than a reducer, it does not compress the image or brighten the field — an FS-60CB goes from 355 mm at f\/5.9 to 370 mm at f\/6.2, and the corners come into line with the centre.\u003c\/p\u003e\u003cp\u003eWhat makes it universal is that the optical correction is common to the FC and FS doublets while only the required spacing differs. Takahashi puts that difference in the CA ring rather than in the glass, so a single flattener covers telescopes from 50 mm to 152 mm of aperture.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/takahashi-fc-fs-mfl-104x-flattener-dimensional-diagram.png?v=1786907633\" alt=\"Dimensional diagram of the Takahashi FC\/FS MFL 1.04x field flattener showing M56x0.75 input thread, M52x0.75 output thread, 40 mm backfocus and 40 mm overall length\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky imaging with a DSLR, mirrorless or cooled astro camera\u003c\/strong\u003e on any current FC or FS doublet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAPS-C and full-frame coverage:\u003c\/strong\u003e the 44 mm circle covers APS-C entirely and reaches most of a full-frame corner.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacing an older model-specific flattener\u003c\/strong\u003e when you own more than one FC or FS tube and want one corrector for both.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field mosaics\u003c\/strong\u003e where edge star shape has to match between panels.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe flattener and the CA ring are bought together — the ring is what sets the metal back distance for your particular telescope. Takahashi publishes the pairing:\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTakahashi part\u003c\/th\u003e\n\u003cth\u003eCA ring\u003c\/th\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eMetal back distance\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTKA20203\u003c\/td\u003e\n\u003ctd\u003eCA-60C\u003c\/td\u003e\n\u003ctd\u003eFS-60CB\u003c\/td\u003e\n\u003ctd\u003e87.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTKA18203\u003c\/td\u003e\n\u003ctd\u003eCA-76\u003c\/td\u003e\n\u003ctd\u003eFC-76D, FC-76, FS-78\u003c\/td\u003e\n\u003ctd\u003e75.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTKA19203\u003c\/td\u003e\n\u003ctd\u003eCA-100\u003c\/td\u003e\n\u003ctd\u003eFC-100D, FC-100\u003c\/td\u003e\n\u003ctd\u003e71.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTKA01203\u003c\/td\u003e\n\u003ctd\u003eCA-50\u003c\/td\u003e\n\u003ctd\u003eFC-50\u003c\/td\u003e\n\u003ctd\u003e84.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTKA03203\u003c\/td\u003e\n\u003ctd\u003eCA-65\u003c\/td\u003e\n\u003ctd\u003eFC-60, FC-65\u003c\/td\u003e\n\u003ctd\u003e78.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTKA07203\u003c\/td\u003e\n\u003ctd\u003eCA-125\u003c\/td\u003e\n\u003ctd\u003eFC-100DL, FS-102, FC-125\u003c\/td\u003e\n\u003ctd\u003e69.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTKA24203\u003c\/td\u003e\n\u003ctd\u003eCA-128\u003c\/td\u003e\n\u003ctd\u003eFS-128, FS-152\u003c\/td\u003e\n\u003ctd\u003e66.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera side:\u003c\/strong\u003e M52 x 0.75 male, with 40 mm of backfocus to the sensor. Your camera adapter, filter drawer and spacers together need to total that 40 mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters count:\u003c\/strong\u003e a filter in the light path adds roughly one third of its thickness to the optical path. A 2 mm filter shifts focus by about 0.7 mm, which comes out of the spacer stack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot compatible with the FOA-60 or SKY90.\u003c\/strong\u003e Both use different optical designs. The FOA-60 has its own 0.93x flattener; ask us and we will point you to the right part.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you tell us your telescope, camera and any filters you use, we will work out the spacer stack with you and confirm the CA ring 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\u003eThe CA ring is a separate purchase.\u003c\/strong\u003e The flattener does not include one, and it will not reach correct spacing without the ring matched to your telescope. The table above names it; we stock the range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is a photographic corrector.\u003c\/strong\u003e It has no application in a visual train with an eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackfocus is 40 mm from the rear thread.\u003c\/strong\u003e The corner star shape follows how closely your adapter stack hits that figure, and the diagram above gives you the reference distances to measure against.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe corrected circle depends on the telescope.\u003c\/strong\u003e 44 mm on the shorter tubes, 40 mm on the longer ones — the list above tells you which applies. A full-frame sensor has a 43.3 mm diagonal, so full-frame corners are covered on the 44 mm group and just short on the 40 mm group.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt does not fit the FOA-60 or SKY90.\u003c\/strong\u003e Those telescopes take their own correctors.\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\u003eIt threads on directly — the CA ring goes on the telescope, the flattener onto the ring, and your camera adapter behind it. The work is in getting the 40 mm backfocus right on the camera side, and that is arithmetic rather than trial and error: add up your adapter, filter drawer and spacers to 40 mm. Send us your camera and filter setup and we will do the sum with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it change my focal length?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSlightly. The 1.04x factor takes a 355 mm FS-60CB to 370 mm and f\/5.9 to f\/6.2. It is a flattener, not a reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich CA ring do I need?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe table above pairs every FC and FS telescope with its ring and metal back distance. For an FS-60CB it is the CA-60C, Takahashi part TKA20203.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it cover a full-frame sensor?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOn the 44 mm group — FS-60CB, FC-76D, FC-100D, FC-50, FC-65, FC-76, FS-78 — yes, a full-frame diagonal of 43.3 mm sits inside the corrected circle. On the 40 mm group the extreme corners fall outside it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with a filter in the train?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Allow for the focus shift a filter introduces — about a third of its thickness — when you build the spacer stack to 40 mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between this and the older flatteners?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi previously sold a flattener per telescope. This one optic covers the whole FC and FS doublet range, with the CA ring handling the model-specific spacing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work on my FOA-60?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — the FOA-60 and SKY90 use different optical designs. The FOA-60 takes the dedicated 0.93x flattener.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: one 110 g corrector that flattens the field across the whole FC and FS doublet range, giving a 44 mm circle on the shorter tubes and 40 mm on the longer ones, at 40 mm of backfocus. Pair it with the CA ring for your telescope and it does its job — and we will confirm which ring and what spacing before you order.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54046965858415,"sku":"TAK-TKA00582","price":303.16,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA00582_1.jpg?v=1786907709"},{"product_id":"takahashi-ca-76-multi-flattener-ca-ring","title":"Takahashi CA-76 Multi-Flattener CA Ring","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CA-76 is the spacer ring that sets correct back focus for the \u003ca href=\"\/products\/takahashi-fc-fs-multi-flattener-1-04x-field-flattener\"\u003eTakahashi FC\/FS Multi-Flattener 1.04x\u003c\/a\u003e on the FC-76D, FC-76 and FS-78. The flattener is a common optic across the FC and FS doublet line; the CA ring is what makes the spacing correct for your specific tube. Fitted with the CA-76, the pair sets a 75.0 mm metal back distance, the figure Takahashi publishes for this telescope group.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own an FC-76D, FC-76 or FS-78 and are fitting the FC\/FS Multi-Flattener 1.04x for imaging. It has no function on its own — it is bought alongside the flattener, not instead of it.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope-specific spacing:\u003c\/strong\u003e sets the 75.0 mm metal back distance Takahashi publishes for the FC-76D, FC-76 and FS-78 with this flattener.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads directly onto the Multi-Flattener:\u003c\/strong\u003e the ring's accessory side mates with the flattener's M56 x 0.75 telescope-side thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact and light:\u003c\/strong\u003e a single machined ring, adding minimal length ahead of the flattener.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging setup on the FC-76D, FC-76 or FS-78:\u003c\/strong\u003e fitted between telescope and flattener whenever this model group is used for astrophotography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitching the Multi-Flattener between tubes:\u003c\/strong\u003e if you own more than one FC or FS telescope, the CA ring is what changes when you move the flattener across them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CA-76 is one of seven CA rings Takahashi publishes for the Multi-Flattener 1.04x, each matched to a different telescope group:\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eCA ring\u003c\/th\u003e\n\u003cth\u003eTakahashi part\u003c\/th\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eMetal back distance\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-50\u003c\/td\u003e\n\u003ctd\u003eTKA01203\u003c\/td\u003e\n\u003ctd\u003eFC-50\u003c\/td\u003e\n\u003ctd\u003e84.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-60C\u003c\/td\u003e\n\u003ctd\u003eTKA20203\u003c\/td\u003e\n\u003ctd\u003eFS-60CB\u003c\/td\u003e\n\u003ctd\u003e87.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-65\u003c\/td\u003e\n\u003ctd\u003eTKA03203\u003c\/td\u003e\n\u003ctd\u003eFC-60, FC-65\u003c\/td\u003e\n\u003ctd\u003e78.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-76\u003c\/td\u003e\n\u003ctd\u003eTKA18203\u003c\/td\u003e\n\u003ctd\u003eFC-76D, FC-76, FS-78\u003c\/td\u003e\n\u003ctd\u003e75.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-100\u003c\/td\u003e\n\u003ctd\u003eTKA19203\u003c\/td\u003e\n\u003ctd\u003eFC-100D, FC-100\u003c\/td\u003e\n\u003ctd\u003e71.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-125\u003c\/td\u003e\n\u003ctd\u003eTKA07203\u003c\/td\u003e\n\u003ctd\u003eFC-100DL, FS-102, FC-125\u003c\/td\u003e\n\u003ctd\u003e69.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-128\u003c\/td\u003e\n\u003ctd\u003eTKA24203\u003c\/td\u003e\n\u003ctd\u003eFS-128, FS-152\u003c\/td\u003e\n\u003ctd\u003e66.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eFull spacing figures for the FC and FS line are in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\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\u003eIt does not work alone.\u003c\/strong\u003e The CA-76 only sets spacing for the Multi-Flattener 1.04x — the flattener itself is a separate purchase.\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 threads between the telescope and the flattener, setting the 75.0 mm back focus without any adjustment on your part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need this if I already own the Multi-Flattener?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, if your telescope is an FC-76D, FC-76 or FS-78. The flattener ships without a ring; the ring is what makes it fit your tube.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the CA-76 fit a different FC or FS model?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — each CA ring is matched to a specific telescope group and back focus figure. Send us your model and we will confirm the right ring.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: the spacer ring that fits the FC\/FS Multi-Flattener 1.04x to the FC-76D, FC-76 and FS-78, setting the 75.0 mm back focus Takahashi publishes for this group.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047104073839,"sku":"TAK-TKA18203","price":48.62,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka18203_1.jpg?v=1786913769"},{"product_id":"takahashi-ca-100-multi-flattener-ca-ring","title":"Takahashi CA-100 Multi-Flattener CA Ring","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CA-100 is the spacer ring that sets correct back focus for the \u003ca href=\"\/products\/takahashi-fc-fs-multi-flattener-1-04x-field-flattener\"\u003eTakahashi FC\/FS Multi-Flattener 1.04x\u003c\/a\u003e on the FC-100D and FC-100. The flattener is a common optic across the FC and FS doublet line; the CA ring is what makes the spacing correct for your specific tube. Fitted with the CA-100, the pair sets a 71.2 mm metal back distance, the figure Takahashi publishes for this telescope group.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own an FC-100D or FC-100 and are fitting the FC\/FS Multi-Flattener 1.04x for imaging. It has no function on its own — it is bought alongside the flattener, not instead of it.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope-specific spacing:\u003c\/strong\u003e sets the 71.2 mm metal back distance Takahashi publishes for the FC-100D and FC-100 with this flattener.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads directly onto the Multi-Flattener:\u003c\/strong\u003e the ring's accessory side mates with the flattener's M56 x 0.75 telescope-side thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact and light:\u003c\/strong\u003e a single machined ring, adding minimal length ahead of the flattener.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging setup on the FC-100D or FC-100:\u003c\/strong\u003e fitted between telescope and flattener whenever this model group is used for astrophotography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitching the Multi-Flattener between tubes:\u003c\/strong\u003e if you own more than one FC or FS telescope, the CA ring is what changes when you move the flattener across them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CA-100 is one of seven CA rings Takahashi publishes for the Multi-Flattener 1.04x, each matched to a different telescope group:\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eCA ring\u003c\/th\u003e\n\u003cth\u003eTakahashi part\u003c\/th\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eMetal back distance\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-50\u003c\/td\u003e\n\u003ctd\u003eTKA01203\u003c\/td\u003e\n\u003ctd\u003eFC-50\u003c\/td\u003e\n\u003ctd\u003e84.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-60C\u003c\/td\u003e\n\u003ctd\u003eTKA20203\u003c\/td\u003e\n\u003ctd\u003eFS-60CB\u003c\/td\u003e\n\u003ctd\u003e87.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-65\u003c\/td\u003e\n\u003ctd\u003eTKA03203\u003c\/td\u003e\n\u003ctd\u003eFC-60, FC-65\u003c\/td\u003e\n\u003ctd\u003e78.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-76\u003c\/td\u003e\n\u003ctd\u003eTKA18203\u003c\/td\u003e\n\u003ctd\u003eFC-76D, FC-76, FS-78\u003c\/td\u003e\n\u003ctd\u003e75.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-100\u003c\/td\u003e\n\u003ctd\u003eTKA19203\u003c\/td\u003e\n\u003ctd\u003eFC-100D, FC-100\u003c\/td\u003e\n\u003ctd\u003e71.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-125\u003c\/td\u003e\n\u003ctd\u003eTKA07203\u003c\/td\u003e\n\u003ctd\u003eFC-100DL, FS-102, FC-125\u003c\/td\u003e\n\u003ctd\u003e69.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-128\u003c\/td\u003e\n\u003ctd\u003eTKA24203\u003c\/td\u003e\n\u003ctd\u003eFS-128, FS-152\u003c\/td\u003e\n\u003ctd\u003e66.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eFull spacing figures for the FC and FS line are in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\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\u003eIt does not work alone.\u003c\/strong\u003e The CA-100 only sets spacing for the Multi-Flattener 1.04x — the flattener itself is a separate purchase.\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 threads between the telescope and the flattener, setting the 71.2 mm back focus without any adjustment on your part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need this if I already own the Multi-Flattener?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, if your telescope is an FC-100D or FC-100. The flattener ships without a ring; the ring is what makes it fit your tube.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the CA-100 fit a different FC or FS model?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — each CA ring is matched to a specific telescope group and back focus figure. Send us your model and we will confirm the right ring.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: the spacer ring that fits the FC\/FS Multi-Flattener 1.04x to the FC-100D and FC-100, setting the 71.2 mm back focus Takahashi publishes for this group.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047104106607,"sku":"TAK-TKA19203","price":48.62,"currency_code":"CAD","in_stock":false}]},{"product_id":"takahashi-ca-60c-multi-flattener-ca-ring","title":"Takahashi CA-60C Multi-Flattener CA Ring","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CA-60C is the spacer ring that sets correct back focus for the \u003ca href=\"\/products\/takahashi-fc-fs-multi-flattener-1-04x-field-flattener\"\u003eTakahashi FC\/FS Multi-Flattener 1.04x\u003c\/a\u003e on the FS-60CB. The flattener is a common optic across the FC and FS doublet line; the CA ring is what makes the spacing correct for your specific tube. Fitted with the CA-60C, the pair sets an 87.5 mm metal back distance, the figure Takahashi publishes for the FS-60CB.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own an FS-60CB and are fitting the FC\/FS Multi-Flattener 1.04x for imaging. It has no function on its own — it is bought alongside the flattener, not instead of it.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope-specific spacing:\u003c\/strong\u003e sets the 87.5 mm metal back distance Takahashi publishes for the FS-60CB with this flattener.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads directly onto the Multi-Flattener:\u003c\/strong\u003e the ring's accessory side mates with the flattener's M56 x 0.75 telescope-side thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact and light:\u003c\/strong\u003e a single machined ring, adding minimal length ahead of the flattener.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging setup on the FS-60CB:\u003c\/strong\u003e fitted between telescope and flattener whenever this compact doublet is used for astrophotography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitching the Multi-Flattener between tubes:\u003c\/strong\u003e if you own more than one FC or FS telescope, the CA ring is what changes when you move the flattener across them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CA-60C is one of seven CA rings Takahashi publishes for the Multi-Flattener 1.04x, each matched to a different telescope group:\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eCA ring\u003c\/th\u003e\n\u003cth\u003eTakahashi part\u003c\/th\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eMetal back distance\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-50\u003c\/td\u003e\n\u003ctd\u003eTKA01203\u003c\/td\u003e\n\u003ctd\u003eFC-50\u003c\/td\u003e\n\u003ctd\u003e84.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-60C\u003c\/td\u003e\n\u003ctd\u003eTKA20203\u003c\/td\u003e\n\u003ctd\u003eFS-60CB\u003c\/td\u003e\n\u003ctd\u003e87.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-65\u003c\/td\u003e\n\u003ctd\u003eTKA03203\u003c\/td\u003e\n\u003ctd\u003eFC-60, FC-65\u003c\/td\u003e\n\u003ctd\u003e78.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-76\u003c\/td\u003e\n\u003ctd\u003eTKA18203\u003c\/td\u003e\n\u003ctd\u003eFC-76D, FC-76, FS-78\u003c\/td\u003e\n\u003ctd\u003e75.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-100\u003c\/td\u003e\n\u003ctd\u003eTKA19203\u003c\/td\u003e\n\u003ctd\u003eFC-100D, FC-100\u003c\/td\u003e\n\u003ctd\u003e71.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-125\u003c\/td\u003e\n\u003ctd\u003eTKA07203\u003c\/td\u003e\n\u003ctd\u003eFC-100DL, FS-102, FC-125\u003c\/td\u003e\n\u003ctd\u003e69.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-128\u003c\/td\u003e\n\u003ctd\u003eTKA24203\u003c\/td\u003e\n\u003ctd\u003eFS-128, FS-152\u003c\/td\u003e\n\u003ctd\u003e66.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eFull spacing figures for the FC and FS line are in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\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\u003eIt does not work alone.\u003c\/strong\u003e The CA-60C only sets spacing for the Multi-Flattener 1.04x — the flattener itself is a separate purchase.\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 threads between the telescope and the flattener, setting the 87.5 mm back focus without any adjustment on your part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need this if I already own the Multi-Flattener?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, if your telescope is an FS-60CB. The flattener ships without a ring; the ring is what makes it fit your tube.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the CA-60C fit a different FC or FS model?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — each CA ring is matched to a specific telescope group and back focus figure. Send us your model and we will confirm the right ring.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: the spacer ring that fits the FC\/FS Multi-Flattener 1.04x to the FS-60CB, setting the 87.5 mm back focus Takahashi publishes for this telescope.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047104204911,"sku":"TAK-TKA20203","price":48.62,"currency_code":"CAD","in_stock":false}]},{"product_id":"takahashi-ca-125-multi-flattener-ca-ring","title":"Takahashi CA-125 Multi-Flattener CA Ring","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CA-125 is the spacer ring that sets correct back focus for the \u003ca href=\"\/products\/takahashi-fc-fs-multi-flattener-1-04x-field-flattener\"\u003eTakahashi FC\/FS Multi-Flattener 1.04x\u003c\/a\u003e on the FC-100DL, FS-102 and FC-125. The flattener is a common optic across the FC and FS doublet line; the CA ring is what makes the spacing correct for your specific tube. Fitted with the CA-125, the pair sets a 69.2 mm metal back distance, the figure Takahashi publishes for this telescope group.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own an FC-100DL, FS-102 or FC-125 and are fitting the FC\/FS Multi-Flattener 1.04x for imaging. It has no function on its own — it is bought alongside the flattener, not instead of it.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope-specific spacing:\u003c\/strong\u003e sets the 69.2 mm metal back distance Takahashi publishes for the FC-100DL, FS-102 and FC-125 with this flattener.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads directly onto the Multi-Flattener:\u003c\/strong\u003e the ring's accessory side mates with the flattener's M56 x 0.75 telescope-side thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact and light:\u003c\/strong\u003e a single machined ring, adding minimal length ahead of the flattener.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging setup on the FC-100DL, FS-102 or FC-125:\u003c\/strong\u003e fitted between telescope and flattener whenever this model group is used for astrophotography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitching the Multi-Flattener between tubes:\u003c\/strong\u003e if you own more than one FC or FS telescope, the CA ring is what changes when you move the flattener across them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CA-125 is one of seven CA rings Takahashi publishes for the Multi-Flattener 1.04x, each matched to a different telescope group:\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eCA ring\u003c\/th\u003e\n\u003cth\u003eTakahashi part\u003c\/th\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eMetal back distance\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-50\u003c\/td\u003e\n\u003ctd\u003eTKA01203\u003c\/td\u003e\n\u003ctd\u003eFC-50\u003c\/td\u003e\n\u003ctd\u003e84.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-60C\u003c\/td\u003e\n\u003ctd\u003eTKA20203\u003c\/td\u003e\n\u003ctd\u003eFS-60CB\u003c\/td\u003e\n\u003ctd\u003e87.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-65\u003c\/td\u003e\n\u003ctd\u003eTKA03203\u003c\/td\u003e\n\u003ctd\u003eFC-60, FC-65\u003c\/td\u003e\n\u003ctd\u003e78.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-76\u003c\/td\u003e\n\u003ctd\u003eTKA18203\u003c\/td\u003e\n\u003ctd\u003eFC-76D, FC-76, FS-78\u003c\/td\u003e\n\u003ctd\u003e75.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-100\u003c\/td\u003e\n\u003ctd\u003eTKA19203\u003c\/td\u003e\n\u003ctd\u003eFC-100D, FC-100\u003c\/td\u003e\n\u003ctd\u003e71.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-125\u003c\/td\u003e\n\u003ctd\u003eTKA07203\u003c\/td\u003e\n\u003ctd\u003eFC-100DL, FS-102, FC-125\u003c\/td\u003e\n\u003ctd\u003e69.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCA-128\u003c\/td\u003e\n\u003ctd\u003eTKA24203\u003c\/td\u003e\n\u003ctd\u003eFS-128, FS-152\u003c\/td\u003e\n\u003ctd\u003e66.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eFull spacing figures for the FC and FS line are in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\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\u003eIt does not work alone.\u003c\/strong\u003e The CA-125 only sets spacing for the Multi-Flattener 1.04x — the flattener itself is a separate purchase.\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 threads between the telescope and the flattener, setting the 69.2 mm back focus without any adjustment on your part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need this if I already own the Multi-Flattener?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, if your telescope is an FC-100DL, FS-102 or FC-125. The flattener ships without a ring; the ring is what makes it fit your tube.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the CA-125 fit a different FC or FS model?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — each CA ring is matched to a specific telescope group and back focus figure. Send us your model and we will confirm the right ring.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: the spacer ring that fits the FC\/FS Multi-Flattener 1.04x to the FC-100DL, FS-102 and FC-125, setting the 69.2 mm back focus Takahashi publishes for this group.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047104761967,"sku":"TAK-TKA07203","price":82.94,"currency_code":"CAD","in_stock":false}]},{"product_id":"takahashi-sd-ring-for-fs-60c-multi-flattener","title":"Takahashi SD Ring for FS-60C Multi-Flattener","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SD Ring is the spacing adapter Takahashi publishes for fitting the \u003ca href=\"\/products\/takahashi-fc-fs-multi-flattener-1-04x-field-flattener\"\u003eFC\/FS Multi-Flattener 1.04x\u003c\/a\u003e to the FS-60C. It threads M55.9 x 0.75 and adds a 17.5 mm light path — the figures Takahashi lists in its accessory ring table for this part.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own an FS-60C and are setting up the FC\/FS Multi-Flattener 1.04x for imaging. It is a spacing part, not a standalone accessory.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM55.9 x 0.75 thread:\u003c\/strong\u003e the interface Takahashi publishes for this ring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17.5 mm light path:\u003c\/strong\u003e the length it adds to the imaging train ahead of the flattener.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurpose-built for the FS-60C:\u003c\/strong\u003e distinct from the CA-60C ring used on the FS-60CB.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eImaging setup on the FS-60C\u003c\/strong\u003e with the FC\/FS Multi-Flattener 1.04x.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi's own accessory ring table notes that the SD Ring cannot be threaded onto the female port of the Camera Angle Adjuster S — the same restriction applies to the M55.9 Extension Tube L30. If your train includes the Camera Angle Adjuster S, check the fit with us before ordering. Full spacing figures for the FC and FS line are in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\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\u003eIt does not work alone.\u003c\/strong\u003e The SD Ring only sets spacing for the Multi-Flattener 1.04x on the FS-60C — the flattener itself is a separate purchase.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for use with the Camera Angle Adjuster S\u003c\/strong\u003e — Takahashi's own documentation flags this combination as incompatible. If that is part of your train, send us the details and we will confirm an alternative.\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 threads directly into the imaging train ahead of the flattener at the published M55.9 x 0.75 interface.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the same as the CA-60C ring?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. The CA-60C is matched to the FS-60CB; the SD Ring is the part Takahashi publishes for the FS-60C.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with the Camera Angle Adjuster S?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi's documentation says no — the thread will not engage the Camera Angle Adjuster S's female port. Send us your setup and we will work out the right combination.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an M55.9 x 0.75, 17.5 mm spacing ring that sets up the FC\/FS Multi-Flattener 1.04x correctly on the FS-60C.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047107547247,"sku":"TAK-TKA20583","price":54.34,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka20583-1.jpg?v=1786913864"},{"product_id":"takahashi-fct-65d-0-65x-fu-reducer","title":"Takahashi FCT-65D 0.65x FU Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FCT-65D 0.65x FU Reducer is Takahashi's dedicated fluorite focal reducer for the FCT-65D refractor. It brings the telescope's native 400mm f\/6.2 down to 260mm at f\/4.0, and two of its elements are fluorite glass — the material that lets Takahashi push a reduction this aggressive while still holding a flat Φ44mm image circle.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FCT-65D owners imaging wide star fields, nebulae, and comets who want the fastest focal ratio the telescope supports. At f\/4.0 it gathers roughly 2.4x the light of the native f\/6.2 setup for the same exposure time.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite reducer elements:\u003c\/strong\u003e control the chromatic error a reduction this strong would otherwise introduce.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.65x reduction:\u003c\/strong\u003e takes the FCT-65D from 400mm f\/6.2 to 260mm f\/4.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e covers a full APS-C sensor with sharp stars into the corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM55.9 thread mount:\u003c\/strong\u003e installs directly into the FCT-65D drawtube system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer sits mostly inside the FCT-65D's drawtube, so the aggressive 0.65x reduction adds little to the telescope's front-to-back balance. It pairs with the included CA-35 (FURD) spacing ring, which sets a fixed back focus of 56.0mm measured from the rear of the adapter rather than from the telescope's own focal plane — the figure to build your imaging train from. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky imaging of nebulae, clusters, and large galaxies; comet photography where a fast focal ratio shortens the exposures needed on a moving target; general FCT-65D astrophotography where exposure time is at a premium.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFCT-65D\u003c\/td\u003e\n\u003ctd\u003e260mm\u003c\/td\u003e\n\u003ctd\u003ef\/4.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.0mm (from rear of adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring ships with the reducer and fixes the 56.0mm figure above. Camera-side spacing from there follows your camera's own flange distance — the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e covers the full chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBuilt specifically for the FCT-65D:\u003c\/strong\u003e the figures above are for that telescope only — other Takahashi refractors pair with their own dedicated reducers.\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 threads into the FCT-65D drawtube along with the included CA-35 spacing ring, and the 56.0mm back focus figure is fixed by that ring rather than something you measure and adjust yourself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field astrophotography on the FCT-65D, where the 0.65x reduction to f\/4.0 shortens exposures on nebulae, clusters, and comets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual, eyepiece-compatible path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring, included with the reducer, and your camera's own T-ring or adapter to complete the 56.0mm back focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA dedicated fluorite reducer that takes the FCT-65D to 260mm at f\/4.0 with a flat Φ44mm image circle, set up with the included CA-35 ring at a fixed 56.0mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047107907695,"sku":"TAK-TKA11580F","price":1086.8,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka11580f.jpg?v=1786913880"},{"product_id":"takahashi-toa-130-25mm-spacer-ring-for-67-flattener","title":"Takahashi TOA-130 25mm Spacer Ring for 67 Flattener","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis 25 mm ring — Takahashi's \"Ring #82\" — is the TOA-130NFB-specific output adapter for the 67FL Flattener system. The 67FL Flattener corrects a 90 mm image circle at an optimal 106.2 mm back focus, and this ring is what sets that spacing correctly on the TOA-130NFB.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own a TOA-130NFB and are fitting the 67FL Flattener for large-format imaging. It is a spacing part, not a standalone corrector.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e25 mm output length:\u003c\/strong\u003e the figure published for the TOA-130NFB fitting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM92 x 1.0 interface:\u003c\/strong\u003e matches the 67FL Flattener's own thread family.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope-specific:\u003c\/strong\u003e the TOA-150 uses a different ring in the same system, at 17 mm output.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eLarge-format imaging on the TOA-130NFB\u003c\/strong\u003e with the 67FL Flattener, covering the system's 90 mm corrected circle.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 67FL Flattener kit uses different output rings depending on the host telescope: 25 mm for the TOA-130NFB (this ring, TKA31584) and 17 mm for the TOA-150 (TKA26583). Confirm which telescope you're fitting before ordering — the rings are not interchangeable between the two. Full spacing figures are in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\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\u003eIt does not work alone.\u003c\/strong\u003e This ring only sets spacing for the 67FL Flattener on the TOA-130NFB — the flattener itself is a separate purchase.\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 threads onto the 67FL Flattener at the published M92 x 1.0 interface and sets the 25 mm spacing without adjustment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this fit my TOA-150?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — the TOA-150 uses its own 17 mm ring (TKA26583) in the same 67FL Flattener system. This 25 mm ring is specific to the TOA-130NFB.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need the 67FL Flattener as well?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — this ring only sets the spacing; the flattener carries the optics.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: the 25 mm output ring that fits the 67FL Flattener to the TOA-130NFB at the M92 x 1.0 interface, setting up the system's 90 mm corrected image circle.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047108071535,"sku":"TAK-TKA31584","price":127.27,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA31584_1.jpg?v=1786913882"},{"product_id":"takahashi-rd-aux-ring-extender-for-mewlon-300","title":"Takahashi RD Aux Ring Extender for Mewlon-300","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe RD Aux Ring Extender is a 38 mm M72 extension sleeve built for the Mewlon-300CR and Mewlon-300CRS. It sits in the imaging train alongside reducer and extender accessories, and threads to any other Takahashi telescope carrying the same M72 interface.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own a Mewlon-300CR or Mewlon-300CRS and your reducer or extender train needs an additional 38 mm of M72-threaded spacing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM72 thread:\u003c\/strong\u003e Takahashi's standard interface for the Mewlon-300 imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e38 mm length:\u003c\/strong\u003e the extension it adds to your reducer or extender stack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-compatible:\u003c\/strong\u003e fits any Takahashi telescope using the same M72 thread, not only the Mewlon-300.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eBuilding out a reducer or extender train on the Mewlon-300CR or 300CRS\u003c\/strong\u003e where an extra 38 mm of M72 spacing is needed.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIf you're planning a full imaging train and want the spacing confirmed before you order, send us your reducer or extender and we'll work it out with you. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for published telescope back focus figures.\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 threads directly into the M72 imaging train with no adjustment required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit telescopes other than the Mewlon-300?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, any Takahashi telescope using the same M72 thread standard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need this for a standard Mewlon-300 setup?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOnly if your reducer or extender combination needs the extra 38 mm of spacing. Send us your imaging train and we will confirm whether it applies.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 38 mm, M72-threaded extension ring for the Mewlon-300CR and 300CRS reducer\/extender train.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047109316719,"sku":"TAK-TKA83205","price":144.43,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/takahashi-extension-tube-m72-for-mewlon-crs-tka83205-astronomy-plus-1.jpg?v=1786913899"},{"product_id":"takahashi-fc-76dp-0-64x-fu-reducer","title":"Takahashi FC-76DP 0.64x FU Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FC-76DP 0.64x FU Reducer is Takahashi's dedicated fluorite focal reducer for the FC-76DP refractor. It brings the telescope's native 570mm f\/7.5 down to 365mm at f\/4.8, using fluorite elements to keep chromatic error under control at this level of reduction.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FC-76DP owners who image both wide fields and tighter deep-sky targets and want a faster focal ratio without giving up the telescope's sharp, high-contrast optics. Takahashi's own spot-radius figures for this combination run about 1.5 microns across APS-C and under 2 microns even at the edge of full frame.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorite reducer elements:\u003c\/strong\u003e hold chromatic error in check through the 0.64x reduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.64x reduction:\u003c\/strong\u003e takes the FC-76DP from 570mm f\/7.5 to 365mm f\/4.8.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e covers APS-C fully, with strong performance well into full-frame corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM55.9 thread mount:\u003c\/strong\u003e installs directly into the FC-76DP drawtube system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer pairs with the included CA-35 (FURD) spacing ring, which sets a fixed back focus of 56.0mm measured from the rear of the adapter. That figure — not the telescope's native focal plane — is the one to build an imaging train from. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eDeep-sky imaging of nebulae, clusters, and galaxies at a fast f\/4.8; full-frame astrophotography where the wide, well-corrected image circle counts; general FC-76DP imaging where shorter exposures are worth the reduced focal length.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFC-76DP\u003c\/td\u003e\n\u003ctd\u003e365mm\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.0mm (from rear of adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring ships with the reducer and fixes the 56.0mm figure above. Camera-side spacing from there follows your camera's own flange distance — full detail in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBuilt specifically for the FC-76DP:\u003c\/strong\u003e these figures don't carry over to the FC-76DCU or other FC siblings, which use their own reducers.\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 threads into the FC-76DP drawtube with the included CA-35 spacing ring, and the 56.0mm back focus figure is fixed by that ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky astrophotography on the FC-76DP at a fast f\/4.8, across both APS-C and full-frame sensors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built for a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe CA-35 (FURD) spacing ring, included with the reducer, and your camera's own T-ring or adapter to complete the 56.0mm back focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA dedicated fluorite reducer that takes the FC-76DP to 365mm at f\/4.8 with a flat Φ44mm image circle, set up with the included CA-35 ring at a fixed 56.0mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047109349487,"sku":"TAK-TKA18580F","price":1086.8,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka18580f-1.jpg?v=1786913900"},{"product_id":"takahashi-645-reducer-adapter-ring","title":"Takahashi 645 Reducer Adapter Ring","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis adapter ring — numbered \"Ring #82\" in Takahashi's 645-format system charts — is a fitting piece in Takahashi's medium-format reducer train, built around the 645 digital back format. It connects a telescope's output to the reducer side of that train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you are assembling a 645-format reducer imaging train and the system chart for your telescope calls for this adapter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003ePurpose-built for the 645 reducer system:\u003c\/strong\u003e one of the numbered adapter rings in Takahashi's 645-format parts list.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eMedium-format reducer imaging trains\u003c\/strong\u003e built around Takahashi's 645 system.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIf you are assembling a 645-format train and want to confirm this is the correct ring for your telescope, send us the model and we will check it against the system chart with you.\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\u003eIt's a single ring in a numbered system chart — straightforward once you know which position it fills. Send us your telescope and reducer combination and we will confirm it's the right one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this include the 645 Reducer itself?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — this is the adapter ring only. The reducer optics are a separate purchase.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a fitting ring within Takahashi's 645-format reducer system, numbered Ring #82 in Takahashi's system charts.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047109382255,"sku":"TAK-TKA36581","price":148.72,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka36581_3.jpg?v=1786913912"},{"product_id":"takahashi-toa-150b-0-99x-toa-645-field-flattener","title":"Takahashi TOA-150B 0.99x TOA-645 Field Flattener","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-645 Field Flattener 150 Set is Takahashi's dedicated flattener kit for the TOA-150B refractor, built for high-resolution medium-format imaging. It holds the telescope's own 1100mm f\/7.3 essentially unchanged — 1085mm at f\/7.2 — while flattening the field across a Φ60mm image circle, large enough for today's full-frame and medium-format sensors.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis flattener suits TOA-150B owners shooting with large-format cameras — full-frame CMOS or medium-format backs — who need corner-to-corner sharpness across a wide sensor rather than a reduced focal length. Takahashi's own figures put the RMS spot diameter at 1 micron on-axis and 5 microns at the full 60mm diameter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-element flattener:\u003c\/strong\u003e two fully multi-coated elements in two groups, purpose-built for digital sensors rather than adapted from a film-era design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ60mm corrected image circle:\u003c\/strong\u003e covers full-frame and medium-format sensors with minimal fall-off.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNear-native focal length:\u003c\/strong\u003e 1085mm at f\/7.2 keeps the TOA-150B's own field of view essentially intact.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBundled CA35 (50.8) ring:\u003c\/strong\u003e included in this kit, matched to the TOA-150B's mount so the flattener installs as a complete system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe flattener threads to the TOA-150B's 50.8 Adapter on an M72x1 male-to-female interface and outputs to the included CA35 ring on an M54x0.75 female thread. Total kit weight is 330g. The corrected back focus is 56.2mm measured from the CA35 ring — the figure to build the rest of your imaging train from. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eHigh-resolution deep-sky imaging with full-frame or medium-format cameras on the TOA-150B; wide-field mosaicless framing of large nebulae and galaxy fields where the full Φ60mm circle is put to use; observatory and long-exposure narrowband work where field flatness across the whole sensor matters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-150B (this kit, TKA32587S)\u003c\/td\u003e\n\u003ctd\u003e1085mm\u003c\/td\u003e\n\u003ctd\u003ef\/7.2\u003c\/td\u003e\n\u003ctd\u003eΦ60mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-130NS \/ TOA-130NFB\u003c\/td\u003e\n\u003ctd\u003e990mm\u003c\/td\u003e\n\u003ctd\u003ef\/7.6\u003c\/td\u003e\n\u003ctd\u003eΦ60mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eTOA-130NS and TOA-130NFB owners use the sibling kit, the TOA-645 Flattener 130 Set (TKA31587S), which bundles the same flattener with a CA Ring 130 sized for that telescope's mount instead of this kit's CA35 ring — we stock this listing for the TOA-150B specifically. The optical element itself is common to both kits.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSold as a complete kit:\u003c\/strong\u003e the CA35 ring is bundled with this flattener, so there's nothing separate to source to reach the 56.2mm back focus figure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuilt for the TOA-150B:\u003c\/strong\u003e if you own a TOA-130NS or TOA-130NFB instead, the matching kit is the TOA-645 Flattener 130 Set — get in touch and we'll point you to the right one.\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 threads onto the TOA-150B's 50.8 Adapter and outputs directly to the included CA35 ring, which sets the 56.2mm back focus for you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigh-resolution astrophotography on the TOA-150B with full-frame or medium-format sensors, where a flat Φ60mm image circle matters more than a shorter focal length.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it reduce the focal length?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBarely — at 0.99x it holds the TOA-150B close to its native 1100mm f\/7.3, landing at 1085mm f\/7.2. It flattens the field rather than speeding up the system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat's the difference between this and the TOA-35 Reducer?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis flattener keeps the focal length essentially native while widening the corrected circle to Φ60mm. The TOA-35 Reducer instead cuts the focal length to f\/5.2 for a faster, narrower-circle system — the two serve different imaging goals on the same telescope.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA complete TOA-150B flattener kit that holds the telescope near its native 1100mm focal length at f\/7.2 while flattening a Φ60mm image circle for full-frame and medium-format imaging, with the matched CA35 ring included.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047109415023,"sku":"TAK-TKA32587S","price":264.55,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka32587s-1_3.jpg?v=1786913942"},{"product_id":"takahashi-extender-c2x-extender","title":"Takahashi Extender-C2X Extender","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Extender-C2X extends focal length on the FS-60CB, FC-76D and FC-100D. Takahashi's own naming — the \"C2X\" designation — follows the same convention as its other 2x extenders, and the part is built to lengthen the focal length of these doublets without adding measurable aberration of its own.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own an FS-60CB, FC-76D or FC-100D and want to reach a longer effective focal length for tighter framing — small planetary nebulae, galaxies, or lunar and planetary detail — without changing telescopes.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAn extender lengthens the light path between the objective and the focal plane, which increases effective focal length and focal ratio without touching the objective itself. Takahashi builds its extenders to add that length while holding the telescope's own correction, rather than introducing new aberration the objective wasn't designed for — the same principle behind the \u003ca href=\"\/products\/takahashi-ortho-extender-2x-barlow\"\u003eOrtho Extender 2x Barlow\u003c\/a\u003e used elsewhere in the line.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTighter framing on small targets\u003c\/strong\u003e — planetary nebulae, small galaxies, lunar and planetary detail — on the FS-60CB, FC-76D or FC-100D.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtending an existing FC or FS doublet\u003c\/strong\u003e rather than buying a longer-focal-length telescope.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Extender-C2X is matched to the FS-60CB, FC-76D and FC-100D. If you want to confirm it fits your specific imaging train before ordering, send us your telescope and camera and we will work it out with you.\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\u003eIt fits into the imaging train on the FS-60CB, FC-76D or FC-100D the same way any extender does — in line between the telescope and camera. Send us your setup and we will confirm the exact fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eReaching a longer effective focal length on a small FC or FS doublet for tighter framing on small targets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is built for the photographic train on these telescopes; if you want to use it visually, send us your eyepiece setup and we will confirm the fit.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a focal-length extender for the FS-60CB, FC-76D and FC-100D, built to lengthen the light path without adding aberration of its own.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047109447791,"sku":"TAK-TKA00594","price":155.87,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA00594_1.jpg?v=1786913952"},{"product_id":"takahashi-aux-ring-for-645-reducer","title":"Takahashi AUX Ring for 645 Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis auxiliary ring fits into Takahashi's 645-format reducer imaging train, on the telescope side of the 645 Reducer. It is a fitting piece rather than an optical part — the reducer itself carries the correction.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you are assembling a 645-format reducer imaging train and your telescope's system chart calls for this auxiliary ring.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eMedium-format reducer imaging trains\u003c\/strong\u003e built around Takahashi's 645 Reducer system.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIf you are assembling a 645-format train and want to confirm this is the correct ring for your telescope, send us the model and we will check it against the system chart with you.\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\u003eIt's a single ring in the 645 Reducer system — straightforward once you know which position it fills. Send us your telescope and we will confirm it's the right one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this include the 645 Reducer itself?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — this is the auxiliary ring only. The reducer optics are a separate purchase.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a fitting ring for the telescope side of Takahashi's 645 Reducer train.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047109775471,"sku":"TAK-TKA36582","price":157.3,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka36582_3.jpg?v=1786913963"},{"product_id":"takahashi-aux-ring-0-7x-645-reducer-for-toa-130-fsq-130ed","title":"Takahashi AUX Ring 0.7x 645 Reducer for TOA-130\/FSQ-130ED","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis auxiliary ring fits the 0.7x 645 Reducer to the TOA-130 and FSQ-130ED. It's the telescope-side fitting piece in Takahashi's 645-format reducer system — the reducer itself supplies the 0.7x optical correction and focal-length reduction.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own a TOA-130 or FSQ-130ED and are fitting the 0.7x 645 Reducer for medium-format imaging.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eMedium-format imaging on the TOA-130 or FSQ-130ED\u003c\/strong\u003e with the 0.7x 645 Reducer.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis ring is specific to the TOA-130 and FSQ-130ED fitting of the 0.7x 645 Reducer system. Send us your telescope and reducer combination and we will confirm the fit before you order.\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\u003eIt's a single fitting ring between the telescope and the 0.7x 645 Reducer — straightforward once the reducer is on hand. Send us your telescope and we will confirm it's the right one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this include the 0.7x 645 Reducer itself?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — this is the auxiliary ring only. The reducer optics are a separate purchase.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: the TOA-130\/FSQ-130ED fitting ring for Takahashi's 0.7x 645 Reducer.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047111577711,"sku":"TAK-TKA38206","price":201.63,"currency_code":"CAD","in_stock":false}]},{"product_id":"takahashi-toa130fn-flattener-wide-t-mount","title":"Takahashi TOA130FN Flattener Wide T-Mount","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA130FN combines a field flattener with a T-mount adapter in one part, built for DSLR and 35mm film photography on the TOA-130. It attaches your camera directly to the telescope through a T-Ring (sold separately), or through the Extender TOA when you need additional focal length.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you own a TOA-130 and want to shoot with a DSLR or 35mm film body directly on the telescope, with the field corrected for a flat frame.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eCombining the flattener and T-mount interface into a single part removes one connection point from the imaging train compared with fitting a separate flattener and T-ring adapter — fewer joints to seat correctly, and one less place for the stack to drift out of square. The flattener element corrects the field curvature the TOA-130's triplet objective otherwise produces at prime focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDSLR and 35mm film astrophotography on the TOA-130\u003c\/strong\u003e at prime focus, corrected for field curvature.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtending the setup\u003c\/strong\u003e with the Extender TOA when a longer focal length is wanted for the same camera.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA camera-specific T-Ring is required and sold separately — the TOA130FN provides the T-mount interface, not the camera-side bayonet. It is also compatible with the Extender TOA for extended focal length work. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for TOA-130 back focus figures, and send us your camera body if you want the T-Ring confirmed 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\u003eA T-Ring is not included.\u003c\/strong\u003e It is sold separately and is specific to your camera mount — tell us your camera and we will confirm the right one.\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 threads onto the TOA-130 and takes a T-Ring on the camera side, combining the flattener and mount into one connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a separate flattener as well?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — the flattener is built into this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with the Extender TOA?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — it's compatible with the Extender TOA for extended focal length imaging.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a combined field flattener and T-mount adapter for DSLR and 35mm imaging on the TOA-130, taking a camera-specific T-Ring on the back.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047111643247,"sku":"TAK-TKA31201","price":230.23,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tca1050_3_6.jpg?v=1786913992"},{"product_id":"takahashi-epsilon-130d-1-5x-extender","title":"Takahashi Epsilon-130D 1.5x Extender","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Epsilon Extender 1.5x E-130D extends the Epsilon-130D astrograph's native 430mm f\/3.3 to 650mm f\/5.0, while carrying the same coma correction that makes the Epsilon series sharp to the edge of frame at prime focus. Seven elements in five groups do the work of both magnifying the image and holding coma in check at the same time.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis extender suits Epsilon-130D owners who want a longer working focal length for tighter deep-sky targets — galaxies, planetary nebulae, small clusters — without switching to a slower, narrower-field telescope. It keeps the fast, coma-corrected imaging the Epsilon series is built for, just at 650mm instead of 430mm.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7 elements in 5 groups:\u003c\/strong\u003e a full optical assembly, not a simple magnifying lens, that maintains coma correction at the extended focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.5x extension:\u003c\/strong\u003e takes the Epsilon-130D from 430mm f\/3.3 to 650mm f\/5.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e diffraction-limited performance, about 2 microns at the center and up to 8 microns at the edge of a full-frame sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM60 input \/ M54 output threads:\u003c\/strong\u003e matches the Epsilon-130D's camera angle adjuster on one side and standard M54 camera adapters on the other.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe extender's seven-element, five-group design re-corrects coma at the longer focal length rather than simply magnifying the uncorrected image the way a basic Barlow would. Back focus is 56.2mm, the same figure the Epsilon-130D uses at prime focus, so an existing spacing setup carries over. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eImaging smaller deep-sky targets — planetary nebulae, compact galaxies, globular clusters — that are undersized in the Epsilon-130D's native 430mm field; narrowband imaging where the extra focal length helps frame a target more tightly; general astrophotography where 650mm f\/5.0 suits the target better than 430mm f\/3.3.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEpsilon-130D\u003c\/td\u003e\n\u003ctd\u003e650mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe extender is specific to the Epsilon-130D — the Epsilon-160ED and Epsilon-180ED each use their own dedicated 1.5x extender, matched to their own thread sizes and back focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eScrew-in 2\" filters aren't recommended\u003c\/strong\u003e with this extender, since Takahashi notes they can introduce reflections at this focal ratio — a filter wheel or camera-side filter mounting avoids the issue.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAt 450g,\u003c\/strong\u003e it's light enough that it's the camera and filter wheel on the other end of the train, not the extender itself, that will drive your balance point.\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 installs between the Epsilon-130D's camera angle adjuster and your camera on M60 and M54 threads, and the 56.2mm back focus matches the telescope's native prime-focus figure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eImaging deep-sky targets that need more reach than the Epsilon-130D's native 430mm provides, while keeping the coma correction the Epsilon series is known for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt's built as an imaging accessory — the corrected image circle and mechanical interfaces are designed around camera sensors rather than eyepieces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or M54 adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA coma-corrected 1.5x extender that takes the Epsilon-130D to 650mm at f\/5.0 across a Φ44mm image circle, at the same 56.2mm back focus the telescope already uses at prime focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047111938159,"sku":"TAK-TKA69595","price":1287.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka69595_3.jpg?v=1786913997"},{"product_id":"takahashi-epsilon-160ed-1-5x-extender","title":"Takahashi Epsilon-160ED 1.5x Extender","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Epsilon Extender 1.5x E-160ED extends the Epsilon-160ED astrograph's native 530mm f\/3.3 to 800mm f\/5.0, carrying the coma correction the Epsilon series is built around through to the longer focal length. Seven elements in five groups do the magnifying and the correcting together, rather than adding pure magnification on top of an uncorrected image.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis extender suits Epsilon-160ED owners who want more reach for tighter deep-sky targets — galaxies, planetary nebulae, compact clusters — while keeping the fast, coma-corrected imaging the Epsilon-160ED is built for. Takahashi rates the native Epsilon-160ED at an RMS spot radius within 1.3 microns across a full-frame field; the extender is built to preserve that standard at 800mm.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7 elements in 5 groups:\u003c\/strong\u003e a complete optical assembly that maintains coma correction at the extended focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.5x extension:\u003c\/strong\u003e takes the Epsilon-160ED from 530mm f\/3.3 to 800mm f\/5.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e diffraction-limited performance, roughly 2 microns at center and up to 8 microns at the edge of a full-frame sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatched thread interfaces:\u003c\/strong\u003e installs between the Epsilon-160ED's camera angle adjuster and a standard camera adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus with the extender in place is 56.2mm — the same figure the Epsilon-160ED uses at prime focus — so an existing spacing setup carries over directly. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eImaging smaller deep-sky targets that are undersized in the Epsilon-160ED's native 530mm field; narrowband and high-resolution work where the extra reach helps frame a target tightly; general astrophotography where 800mm f\/5.0 suits the target better than 530mm f\/3.3.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEpsilon-160ED\u003c\/td\u003e\n\u003ctd\u003e800mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe extender is specific to the Epsilon-160ED — the Epsilon-130D and Epsilon-180ED each use their own dedicated 1.5x extender, sized for their own thread interfaces.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eScrew-in 2\" filters aren't recommended\u003c\/strong\u003e with this extender, as Takahashi notes they can introduce reflections at this focal ratio — a filter wheel or camera-side filter mounting avoids the issue.\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 installs between the Epsilon-160ED's camera angle adjuster and your camera, and the 56.2mm back focus matches the telescope's native prime-focus figure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eImaging deep-sky targets that need more reach than the Epsilon-160ED's native 530mm provides, while keeping the coma correction the Epsilon series is known for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt's built as an imaging accessory — the corrected image circle and mechanical interfaces are designed around camera sensors rather than eyepieces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA coma-corrected 1.5x extender that takes the Epsilon-160ED to 800mm at f\/5.0 across a Φ44mm image circle, at the same 56.2mm back focus the telescope already uses at prime focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047112134767,"sku":"TAK-TKA59595","price":1401.4,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/e-ext160ed_320x_9bf13e78-a41f-4129-a430-649bd1c0e8cd.jpg?v=1786914025"},{"product_id":"takahashi-ortho-extender-4x","title":"Takahashi Ortho Extender 4X Barlow-Type Extender","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Ortho Extender 4X is Takahashi's high-power extender for lunar, planetary, and small-target imaging. It follows the same design goal as the 2x Ortho Extender — expanding focal length without adding aberration to an already well-corrected telescope. The unit threads onto the focuser drawtube with an M43 x 0.75 male fitting, measures 46 mm in diameter by 125 mm long, and has a published weight of 240 g.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you image the Moon, the solar corona during an eclipse, or small planetary nebulae and galaxies with a small-sensor camera, and want more reach from a telescope you already own. It also serves visual observers chasing high magnification with contrast intact.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal 4x magnification:\u003c\/strong\u003e extends focal length roughly fourfold, with the realized factor set by the backfocus in the imaging or visual train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM43 x 0.75 male mount:\u003c\/strong\u003e threads directly to a Takahashi drawtube or accessory with the matching female thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo extension tubes included:\u003c\/strong\u003e the Vari-tube S (20 mm) and Vari-tube L (40 mm), plus an M42-31.7AD adapter, to bring the achieved magnification toward 4x with a diagonal or ADC in the train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact aluminum barrel:\u003c\/strong\u003e 46 mm diameter, 125 mm length, 240 g.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eLike the 2x Ortho Extender, the 4x unit is built so an aberration-free telescope stays that way with the extender in place — it adds magnification rather than correcting anything. As a Barlow-type element, the realized magnification is a function of the spacing behind it: Takahashi's published diagram for the 2x model plots magnification against backfocus, and the same relationship governs the 4x unit, moving above or below the nominal 4x figure depending on whether a diagonal prism, T-mount, or direct eyepiece follows it. The two included Vari-tubes exist to bring that spacing back toward the point where the 4x figure holds.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eLunar close-ups, solar eclipse corona photography, and planetary imaging with small-format CMOS cameras are the stated use cases. For visual work it holds contrast at high power, useful for double-star splitting and fine lunar detail.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Ortho Extender 4X mounts to any Takahashi focuser or accessory presenting an M43 x 0.75 female thread — it is not built around one telescope model the way a matched flattener is. Because the achieved magnification depends on backfocus, a diagonal, T-mount, or ADC behind it shifts the effective factor slightly; the included Vari-tube S\/L extensions and M42-31.7AD adapter let you dial the spacing in. For how backfocus interacts with the rest of your imaging train, see the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eMagnification varies with spacing:\u003c\/strong\u003e the published 4x figure assumes a specific backfocus, and a diagonal or camera adapter behind it shifts the realized power — the included extension tubes are there to compensate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFraming narrows at 4x:\u003c\/strong\u003e the field of view is well suited to high-power lunar and planetary targets rather than wide-field deep-sky framing.\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 threads directly onto the drawtube's M43 x 0.75 thread. Getting the magnification close to the nominal 4x is a matter of choosing between the included Vari-tube S and L depending on what follows it in the train.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigh-power lunar, planetary, and solar-eclipse imaging, and high-magnification visual observing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it suit wide-field deep-sky imaging?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — at 4x the field narrows well past what wide-field framing needs; the 2x Ortho Extender or a dedicated reducer suits that work better.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat accessories come with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe Vari-tube S (20 mm) and Vari-tube L (40 mm) extension tubes and an M42-31.7AD adapter ship with the unit.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Ortho Extender 4X is a compact, aberration-neutral way to add roughly four times the focal length for lunar, planetary, and solar-eclipse work, mounting on the standard M43 x 0.75 thread and shipping with the extension tubes needed to fine-tune the magnification for your train.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047112527983,"sku":"TAK-TKA00831","price":426.14,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka00831-1_1.jpg?v=1786914045"},{"product_id":"takahashi-ortho-extender-2x-barlow","title":"Takahashi Ortho Extender 2x Barlow","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Ortho Extender 2x is Takahashi's 2x Ortho Barlow: a 130 g, 46 mm x 91 mm barlow lens with a 31.7 mm (1.25\") input barrel, designed to double focal length without adding aberration to an already well-corrected telescope. Unlike a fixed 2x Barlow, its actual magnification is a function of back focus — published by Takahashi as M = 2 + 0.0121 × b, where b is the distance in mm behind the Barlow. At zero back focus it is exactly 2.00x; add distance behind it, as a diagonal or T-mount train does, and the figure climbs from there.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you observe or image the moon, planets or double stars and want to reach beyond your eyepiece set's shortest focal length — or add reach for a small-sensor camera — without introducing the aberration a lower-quality Barlow adds.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe magnification formula is the part worth understanding before you buy. Takahashi publishes three reference points: at 0 mm of back focus — an eyepiece inserted directly — magnification is exactly 2.00x. Behind a T-mount train (roughly 50 mm of back focus), it works out to about 2.61x. Behind a prism star diagonal, at 63.5 mm of back focus, it reaches 2.77x. The lens design — two elements in one group — is built to hold correction across that whole range rather than being optimized for one fixed spacing, and for visual use it is parfocal: swapping eyepieces at a given back focus does not require refocusing. On the camera side, the barrel is a 31.7 mm female sleeve with an M42 x 0.75 male T-thread built in, so it accepts a T-mount directly as well as a standard 1.25\" eyepiece or camera nosepiece.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-power lunar and planetary observation\u003c\/strong\u003e with your existing 1.25\" eyepieces, at roughly 2x their marked magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall-sensor planetary and lunar imaging\u003c\/strong\u003e through the T-thread, where the extra reach concentrates detail on a small chip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble star splitting\u003c\/strong\u003e at the higher power the 2x factor provides.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe barrel accepts standard 31.7 mm (1.25\") accessories on the input side. On the output side, the built-in M42 x 0.75 thread takes a T-mount directly, or a 1.25\" eyepiece for direct visual use. Because the actual magnification depends on what sits behind the Barlow — a diagonal, a T-mount adapter, or nothing at all — the figure to check is your own back focus, not a single quoted number. If you want your exact magnification worked out for your eyepiece, diagonal or camera train, send us the details and we will calculate it with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eMagnification is not a single fixed number.\u003c\/strong\u003e It runs from 2.00x at zero back focus up to 2.77x behind a prism diagonal, per Takahashi's published formula. Check where your accessory sits in that range before assuming a flat 2x.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it drops into the eyepiece holder or camera train like any 1.25\" accessory, with no adjustment needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy isn't the magnification always exactly 2x?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBecause a Barlow's power depends on how far behind it the image forms. Takahashi publishes the relationship as M = 2 + 0.0121 × b: 2.00x with an eyepiece inserted directly, climbing to 2.77x with 63.5 mm of back focus behind a prism diagonal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for imaging as well as visual use?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — the built-in M42 x 0.75 T-thread takes a camera directly, and the parfocal design means eyepiece and camera views stay in focus together at a given spacing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat's it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLunar and planetary work — visual or imaged — where extra reach on your existing eyepieces or a small sensor is the goal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 130 g, parfocal 2x Barlow whose real magnification runs from 2.00x to 2.77x depending on what's behind it — tell us your eyepiece or camera train and we'll work out your number.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/takahashi-2x-ortho-barlow-tka00598-magnification-chart.jpg?v=1786913723\" alt=\"Takahashi 2x Ortho Barlow magnification versus back focus chart, magnification equals 2 plus 0.0121 times back focus in millimeters\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047112560751,"sku":"TAK-TKA00830\/TKA00598","price":195.91,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA00598_1.jpg?v=1786914045"},{"product_id":"takahashi-epsilon-180ed-1-5x-extender","title":"Takahashi Epsilon-180ED 1.5x Extender","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Epsilon Extender 1.5x E-180ED extends the Epsilon-180ED astrograph's native 500mm f\/2.8 to 780mm f\/4.3, carrying the Epsilon series' coma correction through to the longer focal length. Seven elements in five groups magnify and re-correct the image together, holding the same fully-corrected Φ44mm circle the telescope delivers at prime focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis extender suits Epsilon-180ED owners who want more reach for tighter deep-sky targets — galaxies, planetary nebulae, compact clusters — while keeping the fast, coma-corrected imaging the Epsilon-180ED is built for.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7 elements in 5 groups:\u003c\/strong\u003e a complete optical assembly that maintains coma correction at the extended focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.5x extension:\u003c\/strong\u003e takes the Epsilon-180ED from 500mm f\/2.8 to 780mm f\/4.3.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e fully corrected for coma, suited to full-frame sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM68 input \/ M54 output threads:\u003c\/strong\u003e installs between the Epsilon-180ED's camera angle adjuster and a standard camera adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus with the extender in place is 56.2mm, the same figure the Epsilon-180ED uses at prime focus, so an existing spacing setup carries over directly. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eImaging smaller deep-sky targets that are undersized in the Epsilon-180ED's native 500mm field; narrowband and high-resolution imaging where the extra reach helps frame a target tightly; general astrophotography where 780mm f\/4.3 suits the target better than 500mm f\/2.8.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEpsilon-180ED\u003c\/td\u003e\n\u003ctd\u003e780mm\u003c\/td\u003e\n\u003ctd\u003ef\/4.3\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe extender is specific to the Epsilon-180ED — the Epsilon-130D and Epsilon-160ED each use their own dedicated 1.5x extender, sized for their own thread interfaces.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eFilters mount at the camera, not on the extender:\u003c\/strong\u003e Takahashi recommends against screw-in 2\" filters here, so a filter wheel or camera-side filter mount is the way to add narrowband or broadband filtration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAt 550g,\u003c\/strong\u003e it's a modest addition to the imaging train — worth noting once your camera and filter wheel are attached, but not a figure that will drive your balance point on its own.\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 installs between the Epsilon-180ED's camera angle adjuster and your camera on M68 and M54 threads, and the 56.2mm back focus matches the telescope's native prime-focus figure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eImaging deep-sky targets that need more reach than the Epsilon-180ED's native 500mm provides, while keeping the coma correction the Epsilon series is known for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt's built as an imaging accessory — the corrected image circle and mechanical interfaces are designed around camera sensors rather than eyepieces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or M54 adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA coma-corrected 1.5x extender that takes the Epsilon-180ED to 780mm at f\/4.3 across a Φ44mm image circle, at the same 56.2mm back focus the telescope already uses at prime focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047112593519,"sku":"TAK-TKA68595","price":1444.3,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka68595_3.jpg?v=1786914054"},{"product_id":"takahashi-flattener-1-01x-for-fsq-85edx","title":"Takahashi Flattener 1.01x for FSQ-85EDX","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis flattener extends the FSQ-85EDX's corrected field to a 44 mm image circle — enough to cover a full-frame sensor's 43.3 mm diagonal completely. At 1.01x it changes focal length only fractionally, from 450 mm (f\/5.3) to 455 mm (f\/5.4), so this is a corrector rather than a focal-length changer.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is what you need if you image with an FSQ-85EDX on a full-frame sensor and want flat, round stars into the corners of the frame, not just the APS-C centre.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-85EDX's petzval design is already well corrected across a smaller field; this flattener extends that correction out to a 44 mm circle by adding the last small amount of field curvature correction the native optical path doesn't reach on its own. The 1.01x factor is nearly unity — the flattener is doing geometry, not speed — which is why the focal length shift is so small: 450 mm becomes 455 mm, f\/5.3 becomes f\/5.4. Backfocus behind the flattener is 36 mm, with a 56.2 mm metal back distance from the telescope's own reference point, and the front face takes M58 filters directly.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-frame deep-sky imaging on the FSQ-85EDX\u003c\/strong\u003e where the native field falls short of covering the sensor's corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field mosaics\u003c\/strong\u003e where consistent corner star shape across panels matters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe flattener threads M72 x 1.0 male into the telescope side and presents M54 x 0.75 female to your camera adapter, with 36 mm of backfocus to the sensor. The front face's female thread accepts M58 filters directly, ahead of the flattener glass. If you're building out a full imaging train and want the spacer stack confirmed to the 36 mm figure, send us your camera and filter setup and we will work it out with you. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the FSQ-85EDX's full published figures.\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 a photographic corrector.\u003c\/strong\u003e It has no application in a visual train with an eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackfocus is 36 mm from the rear thread.\u003c\/strong\u003e Corner star shape follows how closely your adapter stack hits that figure — send us your setup and we will confirm the spacer stack before you order.\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\u003eIt threads directly onto the FSQ-85EDX at M72 x 1.0. The work is in hitting the 36 mm backfocus on the camera side, which is arithmetic — add up your adapter, filter drawer and spacers, and send us the numbers if you want them checked.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it change my focal length?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOnly slightly — 450 mm at f\/5.3 becomes 455 mm at f\/5.4. It's a flattener, not a reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it cover a full-frame sensor?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — the 44 mm corrected circle covers a full-frame diagonal of 43.3 mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I fit filters directly to it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — the front face takes M58 filters ahead of the flattener glass.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 200 g, 1.01x flattener that gives the FSQ-85EDX a 44 mm corrected circle for full-frame sensors, at 36 mm of backfocus — send us your camera and filter setup and we'll confirm the spacer stack with you.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047112626287,"sku":"TAK-TKA37582","price":351.78,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA37582_1.jpg?v=1786914068"},{"product_id":"takahashi-toa-130-0-7x-toa-35-reducer","title":"Takahashi TOA-130 0.7x TOA-35 Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-35 Reducer 130 Set pairs Takahashi's 0.7x TOA-35 reducer with a CA Ring 130 sized for the TOA-130NS and TOA-130NFB, cutting the telescope's native 1000mm f\/7.7 down to 698mm f\/5.4. The reducer is a 4-element, 3-group ED glass design shared across the whole TOA-35 line — what changes between kits is which CA ring is bundled to match the telescope it's going on.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis kit suits TOA-130NS and TOA-130NFB owners who want a materially faster focal ratio for deep-sky imaging without leaving the TOA series' ED apochromat optics. At f\/5.4 it cuts exposure times substantially versus the native f\/7.7 while holding a flat Φ44mm image circle.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 elements in 3 groups, ED glass:\u003c\/strong\u003e the same optical design used across every TOA-35 reducer kit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.7x reduction:\u003c\/strong\u003e takes the TOA-130NS\/NFB from 1000mm f\/7.7 to 698mm f\/5.4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e flat, sharp field suited to APS-C and smaller full-frame crops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBundled CA Ring 130:\u003c\/strong\u003e sized specifically for the TOA-130's mount, so the kit installs as a matched system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer threads to the CA Ring 130, which is what's bundled in this specific kit — the ring is what changes between TOA-35 Reducer kits, not the reducer optic itself. Back focus is 65.5mm on the TOA-130NS\/NFB. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFaster deep-sky imaging on the TOA-130NS\/NFB where exposure time matters — nebulae, galaxies, and clusters that benefit from f\/5.4 over the native f\/7.7; general astrophotography where a shorter focal length better frames larger targets.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-130NS \/ TOA-130NFB (this kit)\u003c\/td\u003e\n\u003ctd\u003e698mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.4\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e65.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-150B\u003c\/td\u003e\n\u003ctd\u003e775mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.2\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e62.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTSA-120\u003c\/td\u003e\n\u003ctd\u003e635mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.3\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e62.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis is the same 0.7x reducer optic used on the TOA-150B and TSA-120, but bundled here with the CA Ring 130 sized for the TOA-130's mount. TOA-150B and TSA-120 owners use the sibling kit, the \u003cstrong\u003eTOA-35 0.7x Reducer and Camera Ring (TOA-150, TSA-102\/120)\u003c\/strong\u003e, which bundles the identical reducer with the larger CA Ring 150 instead — the two kits are not interchangeable between telescopes even though the optic inside them is the same.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSold as a matched kit:\u003c\/strong\u003e the CA Ring 130 is bundled with this reducer, so there's no separate ring to source for the TOA-130.\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 reducer threads to the included CA Ring 130, which is sized to install directly on the TOA-130NS\/NFB.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky astrophotography on the TOA-130NS\/NFB where the 0.7x reduction to f\/5.4 shortens exposures versus native f\/7.7.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the same reducer as the TOA-150 kit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe optic is identical. What differs is the bundled ring — this kit ships with CA Ring 130 for the TOA-130; the TOA-150\/TSA-120 kit ships with CA Ring 150 instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or adapter to complete the connection at the 65.5mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA matched TOA-35 reducer kit for the TOA-130NS\/NFB, cutting the telescope to 698mm at f\/5.4 across a Φ44mm image circle, with the CA Ring 130 included.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047112691823,"sku":"TAK-TKA31580NS","price":1515.8,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka31580ns_3.jpg?v=1786914087"},{"product_id":"takahashi-foa-60-0-93x-flattener","title":"Takahashi FOA-60 0.93x Flattener","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FOA-60 0.93x Flattener is the field corrector built specifically for Takahashi's FOA-60 Ortho Apochromat. Threaded to the FOA-60's 2-inch drawtube and finishing in an M52 x 0.75 female output, it brings the focal length from 530 mm down to 495 mm at f\/8.2 while flattening the field to within 10 microns across a 44 mm image circle. It weighs 205 g and adds 67 mm of length ahead of the sensor.\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 own the FOA-60 and want a flat, coma-free field for imaging — small-sensor deep-sky work, lunar mosaics, or solar eclipse photography where the corner stars matter as much as the center.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurpose-built for the FOA-60:\u003c\/strong\u003e not a universal flattener — matched specifically to this 60mm ortho-apochromat's native curvature.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm corrected image circle:\u003c\/strong\u003e covers full-frame sensors with the field flattened to within roughly 10 microns.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e495mm f\/8.2 result:\u003c\/strong\u003e a modest 0.93x reduction that trims the native 530mm f\/8.8 slightly while correcting the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact in-line design:\u003c\/strong\u003e 56mm diameter, 67mm long, 205g, threading directly between the 2-inch drawtube and an M52 x 0.75 camera train.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe corrector uses two lens elements in two groups to cancel the FOA-60's residual field curvature, the tradeoff Takahashi's ortho-apochromat design makes for its high on-axis Strehl ratio. The output back focus works out to 56.0 mm from the flattener, so spacing to the sensor is a fixed rather than adjustable figure once the M52 x 0.75 thread is engaged.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eDeep-sky imaging where corner star shape matters, lunar mosaic photography, and solar eclipse imaging with a full-frame or APS-C sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis flattener is matched to the FOA-60 only — the table below is Takahashi's published figure for that pairing.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith FL 0.93x\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFOA-60\u003c\/td\u003e\n\u003ctd\u003e530mm f\/8.8\u003c\/td\u003e\n\u003ctd\u003e495mm f\/8.2\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA28582_FOA-60_FL093x_schema.png?v=1786913972\" alt=\"Dimensional diagram of the Takahashi FOA-60 0.93x Flattener\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003eBackfocus and thread spacing for the whole FOA-60 imaging train are covered in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot combined with the FOA-60Q 1.7x extender:\u003c\/strong\u003e the flattener and the EX 1.7xR extender serve different configurations of the same tube and are not used together.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuilt for imaging, not eyepiece use:\u003c\/strong\u003e the flattened field has no benefit for visual observing, where the FOA-60's native curvature is not a factor.\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 threads onto the FOA-60's 2-inch drawtube on one side and presents an M52 x 0.75 female thread on the camera side, so the spacing is fixed by the part itself rather than something to measure out.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFlat-field imaging on the FOA-60 — deep-sky, lunar, and solar eclipse photography.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work on other Takahashi refractors?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it is matched to the FOA-60's specific curvature. Other Takahashi models use their own matched flatteners; if you are unsure which one applies to your scope, send us your setup and we will confirm it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it change the FOA-60 into the FOA-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — that conversion uses the separate EX 1.7xR extender, which is not used together with this flattener.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FOA-60 0.93x Flattener is the matched corrector for Takahashi's FOA-60, turning it into a 495mm f\/8.2 system with a flat 44mm image circle for imaging, at 205 g and a fixed 56.0mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047112724591,"sku":"TAK-TKA28582","price":476.19,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA28582_FOA-60_flattener_1.jpg?v=1786914111"},{"product_id":"takahashi-toa-150-tsa-120-0-7x-toa-35-reducer-and-camera-ring","title":"Takahashi TOA-150 \/ TSA-120 0.7x TOA-35 Reducer and Camera Ring","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-35 Reducer 150 Set pairs Takahashi's 0.7x TOA-35 reducer with a CA Ring 150 sized for the TOA-150B and TSA-120\/TSA-102, cutting these telescopes to a materially faster focal ratio while holding a flat Φ44mm image circle. The reducer is the same 4-element, 3-group ED glass optic used across the whole TOA-35 line — this kit's CA Ring 150 is what makes it fit the TOA-150 and TSA-120 mounts specifically, and it's the reason a camera ring is called out explicitly in this listing's title.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis kit suits TOA-150B and TSA-120 (and TSA-102) owners who want a faster imaging focal ratio without leaving the ED apochromat optics those telescopes are built around. On the TOA-150B it lands at f\/5.2; on the TSA-120 at f\/5.3 — both a substantial step down from their native focal ratios.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 elements in 3 groups, ED glass:\u003c\/strong\u003e the same optical design used across every TOA-35 reducer kit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.7x reduction:\u003c\/strong\u003e cuts focal length on each compatible telescope to roughly 0.7x native.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e flat, sharp field across the reduced focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBundled CA Ring 150 (\"camera ring\"):\u003c\/strong\u003e sized for the TOA-150B and TSA-120\/TSA-102 mounts, installed as a matched system rather than sourced separately.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer threads to the included CA Ring 150. Back focus is 62.5mm on both the TOA-150B and the TSA-120. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFaster deep-sky imaging on the TOA-150B or TSA-120 where exposure time matters — nebulae, galaxies, and clusters that benefit from the reduced focal ratio; general astrophotography where a shorter focal length better frames larger targets.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-150B (this kit)\u003c\/td\u003e\n\u003ctd\u003e775mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.2\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e62.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTSA-120 (this kit)\u003c\/td\u003e\n\u003ctd\u003e635mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.3\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e62.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-130NS \/ TOA-130NFB\u003c\/td\u003e\n\u003ctd\u003e698mm\u003c\/td\u003e\n\u003ctd\u003ef\/5.4\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e65.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis is the same 0.7x reducer optic used on the TOA-130, but bundled here with the larger CA Ring 150 for the TOA-150 and TSA-120\/TSA-102 mounts. TOA-130NS\/NFB owners use the sibling kit, the \u003cstrong\u003eTOA-35 0.7x Reducer for TOA-130\u003c\/strong\u003e, which bundles the identical reducer with CA Ring 130 instead — the two kits are not interchangeable between telescopes even though the optic inside them is the same.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSold as a matched kit:\u003c\/strong\u003e the CA Ring 150 (the \"camera ring\" in this listing's title) is bundled with the reducer, so there's nothing separate to source for a TOA-150B or TSA-120.\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 reducer threads to the included CA Ring 150, sized to install directly on either telescope's mount.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky astrophotography on the TOA-150B or TSA-120 at a faster focal ratio than either telescope's native configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the same reducer as the TOA-130 kit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe optic is identical. What differs is the bundled ring — this kit ships with CA Ring 150 for the TOA-150\/TSA-120; the TOA-130 kit ships with CA Ring 130 instead.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or adapter to complete the connection at the 62.5mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA matched TOA-35 reducer kit for the TOA-150B and TSA-120\/TSA-102, with the CA Ring 150 camera ring included, delivering a flat Φ44mm image circle at f\/5.2-5.3.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047113674863,"sku":"TAK-TKA32580NS","price":1515.8,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA32580_1.jpg?v=1786914118"},{"product_id":"takahashi-fsq-106edx4-0-6x-f-3-reducer","title":"Takahashi FSQ-106EDX4 0.6x F\/3 Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe F\/3 0.6x Reducer takes the FSQ-106EDX4's native focal length down to 320mm at f\/3.0, one of the fastest focal ratios available for this astrograph. Four elements in three groups, fully multi-coated, deliver a Φ44mm image circle that Takahashi states covers a full 35mm sensor frame.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FSQ-106EDX4 owners chasing the fastest possible imaging speed — faint nebulosity, narrowband work under time pressure, or any target where cutting exposure time matters more than reach. At f\/3.0 it gathers considerably more light per unit time than the FSQ-106EDX4's native configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 elements in 3 groups, multi-coated:\u003c\/strong\u003e built specifically to hold sharpness at an aggressive f\/3.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.6x reduction:\u003c\/strong\u003e takes the FSQ-106EDX4 to 320mm at f\/3.0.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm image circle:\u003c\/strong\u003e covers a full 35mm frame per Takahashi's published figures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM72x1.0 mounting interface:\u003c\/strong\u003e threads directly into the FSQ-106EDX4's camera train.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus is 56.2mm on the FSQ-106EDX4 with this reducer installed — the figure to build the rest of your imaging train around. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFast narrowband and broadband imaging of faint nebulae and galaxies where exposure time is the limiting factor; wide-field deep-sky imaging where f\/3.0 shortens total integration time significantly versus a native-focal-ratio setup.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-106EDX4\u003c\/td\u003e\n\u003ctd\u003e320mm\u003c\/td\u003e\n\u003ctd\u003ef\/3.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eTakahashi also lists this reducer against the FSQ-130ED, where it produces a 390mm focal length.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBuilt for the FSQ-106EDX4 primarily:\u003c\/strong\u003e Takahashi also markets it against the FSQ-130ED.\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 threads directly onto the FSQ-106EDX4's M72x1.0 interface, and the 56.2mm back focus figure is fixed once it's installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFast deep-sky astrophotography on the FSQ-106EDX4, where f\/3.0 cuts exposure time significantly on faint targets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA fast 0.6x reducer that takes the FSQ-106EDX4 to 320mm at f\/3.0 across a full-frame-covering Φ44mm image circle, at a 56.2mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047116361839,"sku":"TAK-TKA38581","price":2288.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka38581_2_6.jpg?v=1786914153"},{"product_id":"takahashi-1-7x-cq-extender-module-for-fs-60q-refractor","title":"Takahashi EX CQ 1.7x Extender for FS-60CB (FS-60Q Conversion)","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe EX CQ 1.7x Extender installs between the focuser and the FS-60CB's fluorite doublet objective, converting the tube's optics to the same 600 mm f\/10.0 configuration published for the FS-60Q. It threads in place with an M55.9 mount and flattens the image circle to 44 mm at the same time as it extends the focal length.\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 own the FS-60CB and want the FS-60Q's longer reach — for solar eclipse photography, lunar and planetary imaging, and higher-magnification visual use — without buying a second optical tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConverts FS-60CB to FS-60Q spec:\u003c\/strong\u003e 355mm f\/5.9 becomes 600mm f\/10.0, matching Takahashi's own FS-60Q optical tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm flattened image circle:\u003c\/strong\u003e the extended path is corrected at the same time it is lengthened.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstalls between focuser and tube:\u003c\/strong\u003e a permanent-feeling but removable module rather than a drawtube accessory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpens up reducer options:\u003c\/strong\u003e Takahashi notes the resulting f\/10 system can be brought back down toward f\/6.2 or f\/4.2 with the matching reducers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60 platform ships as a 355mm f\/5.9 fluorite doublet in CB form. The EX CQ 1.7x sits ahead of the focuser and behind the objective, changing the light path so the whole system performs exactly as Takahashi's dedicated FS-60Q tube does — 600mm at f\/10.0, with the image circle flattened to 44mm and a published back focus of 158.4mm from the rear of the module.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eSolar eclipse and transit photography at longer focal length, lunar and planetary imaging, and higher-power visual observing on a compact 60mm platform.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this pairing for the FS-60CB specifically.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith EX CQ1.7x\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-60CB\u003c\/td\u003e\n\u003ctd\u003e355mm f\/5.9\u003c\/td\u003e\n\u003ctd\u003e600mm f\/10.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e158.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe resulting figures match Takahashi's own FS-60Q optical tube exactly, so accessories rated for the FS-60Q's back focus generally carry over. Full spacing guidance is in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIt replaces the CB configuration rather than sitting alongside it:\u003c\/strong\u003e once installed, the tube runs at f\/10.0 until the module is removed.\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 installs as a single module between the focuser and the objective cell, with no separate spacing to calculate for the base configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eExtending the FS-60CB's reach for solar, lunar, and planetary work at f\/10.0.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this make my FS-60CB an FS-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOptically, yes — the resulting focal length, ratio, image circle, and back focus match Takahashi's FS-60Q tube exactly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I reduce the focal ratio back down afterward?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi notes the resulting f\/10 system pairs with its own reducers to bring the ratio back toward f\/6.2 or f\/4.2 — send us your imaging setup and we will confirm the right one.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe EX CQ 1.7x Extender turns an FS-60CB into the optical equivalent of Takahashi's FS-60Q — 600mm at f\/10.0 with a 44mm flattened image circle and 158.4mm of back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047116394607,"sku":"TAK-TKA20595","price":537.68,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tfk6004qm_1_2_6.jpg?v=1786914166"},{"product_id":"takahashi-cca-250-0-72x-645-reducer-ca","title":"Takahashi CCA-250 0.72x 645 Reducer-CA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 645 Reducer-CA 0.72x is Takahashi's dedicated focal reducer for the CCA-250 Cassegrain astrograph, cutting its focal length by 0.72x to reach 890mm at f\/3.6. The reducer delivers a Φ60mm image circle, sized for medium-format and large full-frame sensors.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits CCA-250 owners who want a materially faster imaging system for deep-sky work with a larger-format camera. Increasing the speed of a Cassegrain design this way shortens integration time on faint targets without sacrificing the large-aperture light grasp the CCA-250 is built around.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.72x reduction:\u003c\/strong\u003e speeds up the CCA-250's optical system to f\/3.6 at 890mm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ60mm image circle:\u003c\/strong\u003e sized for larger imaging sensors, medium format included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated CCA-250 fit:\u003c\/strong\u003e engineered specifically for this telescope's Cassegrain optical path rather than adapted from a refractor reducer.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus with the reducer installed is 56.2mm on the CCA-250. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain when planning your camera train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFast deep-sky imaging on the CCA-250 with medium-format or large full-frame cameras; galaxy and nebula imaging where a faster focal ratio meaningfully shortens total exposure time on a large-aperture Cassegrain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCCA-250\u003c\/td\u003e\n\u003ctd\u003e890mm\u003c\/td\u003e\n\u003ctd\u003ef\/3.6\u003c\/td\u003e\n\u003ctd\u003eΦ60mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis reducer is specific to the CCA-250 — the related 645RD QE 0.72x reducer serves the FSQ-106EDX4 instead, and the two aren't interchangeable between telescopes despite the similar naming and reduction factor.\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 installs into the CCA-250's optical path as a dedicated fit, and the 56.2mm back focus figure is fixed once it's in place.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFast deep-sky astrophotography on the CCA-250 with medium-format or large full-frame sensors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA dedicated 0.72x reducer for the CCA-250 that reaches 890mm at f\/3.6 across a Φ60mm image circle for medium-format astrophotography, at a 56.2mm back focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047117443183,"sku":"TAK-TKA86580L","price":2988.7,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka86580l_3.jpg?v=1786914180"},{"product_id":"takahashi-mewlon-focal-reducer-flattener","title":"Takahashi Mewlon Focal Reducer\/Flattener (M-FLRD)","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe M-FLRD is Takahashi's combined reducer, flattener, and corrector for the Mewlon Dall-Kirkham Cassegrain line. On the Mewlon-180C it brings the native 2160mm f\/12.0 down to 1760mm f\/9.8; on the Mewlon-210 it brings 2415mm f\/11.5 down to 1961mm f\/9.3, in both cases correcting the field to a 30mm image circle at the same time.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own a Mewlon-180C or Mewlon-210 and want a faster, flatter field for imaging rather than the native long-focal-length Cassegrain configuration typically used for planetary and lunar visual work.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree functions in one unit:\u003c\/strong\u003e reduces the focal ratio, flattens the field, and corrects residual aberration for the Mewlon Cassegrain design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMewlon-180C:\u003c\/strong\u003e 2160mm f\/12.0 native becomes 1760mm f\/9.8.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMewlon-210:\u003c\/strong\u003e 2415mm f\/11.5 native becomes 1961mm f\/9.3.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30mm corrected image circle\u003c\/strong\u003e on both telescopes, with a matched 56.2mm back focus.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Mewlon's Dall-Kirkham Cassegrain design is optimized natively for long-focal-length planetary and lunar work; the M-FLRD trades some of that reach for a faster, corrected field better suited to deep-sky imaging on both the 180C and 210. Because it is a shared design across both apertures, the resulting f-ratio differs slightly between them — f\/9.8 on the 180C and f\/9.3 on the 210 — while the 30mm image circle and 56.2mm back focus hold constant.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eDeep-sky imaging on a Mewlon-180C or Mewlon-210 where a faster, flatter field is preferred over the native long-focus Cassegrain configuration; galaxy and planetary nebula framing at a more forgiving focal ratio.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this reducer\/flattener for two Mewlon models.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith M-FLRD\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMewlon-180C\u003c\/td\u003e\n\u003ctd\u003e2160mm f\/12.0\u003c\/td\u003e\n\u003ctd\u003e1760mm f\/9.8\u003c\/td\u003e\n\u003ctd\u003eΦ30mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMewlon-210\u003c\/td\u003e\n\u003ctd\u003e2415mm f\/11.5\u003c\/td\u003e\n\u003ctd\u003e1961mm f\/9.3\u003c\/td\u003e\n\u003ctd\u003eΦ30mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eFor spacing this reducer correctly with your camera, see the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot for Mewlon-250CRS or Mewlon-300CRS:\u003c\/strong\u003e those larger Mewlon CRS telescopes use the separate Reducer-CR and Extender-CR line rather than the M-FLRD.\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 threads to the Mewlon's rear cell in place of the standard visual back, with the 56.2mm back focus fixed by the unit rather than something to measure out separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky imaging on the Mewlon-180C or Mewlon-210 at a faster, corrected focal ratio.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the same part work on both the Mewlon-180C and Mewlon-210?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — it is a shared design, with a slightly different resulting f-ratio on each telescope.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on the Mewlon-250CRS or 300CRS?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — those models use the separate Reducer-CR\/Extender-CR line. If you are unsure which corrector matches your Mewlon, send us the model and we will confirm it.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe M-FLRD is the matched reducer, flattener, and corrector for the Mewlon-180C and Mewlon-210, trading some of the Mewlon's native reach for a faster, flatter 30mm image circle suited to deep-sky imaging.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047117475951,"sku":"TAK-TKA70581","price":556.27,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tmc1800_2_6.jpg?v=1786914202"},{"product_id":"takahashi-fsq-106edx4-0-72x-645rd-qe-reducer","title":"Takahashi FSQ-106EDX4 0.72x 645RD QE Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 645RD QE 0.72x Reducer is Takahashi's medium-format focal reducer for the FSQ-106EDX4, cutting its focal length by 0.72x to reach 380mm at f\/3.6. Four large-diameter lenses deliver a Φ60mm image circle with Takahashi's published figures putting relative illumination above 70% at the periphery and above 90% across a full-frame sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FSQ-106EDX4 owners shooting with medium-format or large full-frame cameras who want a faster focal ratio for wide, deep-sky fields — large nebula complexes, galaxy clusters, and Milky Way mosaics.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 lenses in 4 groups:\u003c\/strong\u003e large-diameter elements sized for a 60mm image circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.72x reduction:\u003c\/strong\u003e takes the FSQ-106EDX4 to 380mm at f\/3.6.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad-spectrum multilayer coatings:\u003c\/strong\u003e minimize reflections and ghosting while maximizing transmission across visible wavelengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM72x0.75 male input thread:\u003c\/strong\u003e installs directly on the FSQ-106EDX4's camera train.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe reducer measures 74.2mm in total length and sets a back focus of 56.2mm, matching the metal back distance published for this configuration. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky imaging on the FSQ-106EDX4 with medium-format or large full-frame sensors; nebula and galaxy field imaging where the full Φ60mm circle is put to use; general astrophotography where f\/3.6 shortens exposure times against the FSQ-106EDX4's native configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-106EDX4\u003c\/td\u003e\n\u003ctd\u003e380mm\u003c\/td\u003e\n\u003ctd\u003ef\/3.6\u003c\/td\u003e\n\u003ctd\u003eΦ60mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis reducer is specific to the FSQ-106EDX4 — the similarly-named 645 Reducer-CA 0.72x serves the CCA-250 instead, and the two aren't interchangeable between telescopes.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAt 200g,\u003c\/strong\u003e it's a light addition to the imaging train, though it's worth accounting for once your camera and any filters are attached and the whole assembly is balanced on the focuser.\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 threads directly onto the FSQ-106EDX4's M72x0.75 interface, and the 56.2mm back focus figure is fixed once it's installed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field deep-sky astrophotography on the FSQ-106EDX4 with medium-format and large full-frame sensors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA medium-format 0.72x reducer that takes the FSQ-106EDX4 to 380mm at f\/3.6 across a Φ60mm image circle, at a 56.2mm back focus and a published weight of 200g.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047117508719,"sku":"TAK-TKA36580L","price":3274.7,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka36580l_2_6.jpg?v=1786914208"},{"product_id":"takahashi-fsq-130ed-0-7x-645-reducer","title":"Takahashi FSQ-130ED 0.7x 645 Reducer","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 645 Reducer 0.7x is Takahashi's focal reducer for the FSQ-130ED, cutting the telescope's focal length by 0.7x to increase imaging speed for large-format sensors. It produces a Φ70mm image circle, the widest of any 645-series reducer in the Takahashi line, sized for large medium-format backs.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis reducer suits FSQ-130ED owners running large-format or medium-format cameras who want a faster system for wide, deep-sky fields without cropping the sensor's full coverage.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.7x reduction:\u003c\/strong\u003e increases the FSQ-130ED's imaging speed for large-format sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ70mm image circle:\u003c\/strong\u003e the widest corrected circle in Takahashi's 645 reducer lineup, suited to large medium-format chips.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky imaging on the FSQ-130ED with large-format or medium-format cameras; nebula and galaxy field imaging where the wide Φ70mm circle is put to full use.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eReduction factor\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-130ED\u003c\/td\u003e\n\u003ctd\u003e0.7x\u003c\/td\u003e\n\u003ctd\u003eΦ70mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis reducer is specific to the FSQ-130ED and is a different part from the 645RD QE 0.72x (FSQ-106EDX4) and the 645 Reducer-CA 0.72x (CCA-250) — the three share a naming pattern but are not interchangeable between telescopes.\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\u003eIt installs into the FSQ-130ED's imaging train as a dedicated reducer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field deep-sky astrophotography on the FSQ-130ED with large-format sensors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's built to deliver a flat photographic image circle rather than a visual eyepiece path.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own adapter to complete the connection — send us your setup and we'll confirm the spacing with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 0.7x reducer for the FSQ-130ED delivering a wide Φ70mm image circle for large-format astrophotography.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047117803631,"sku":"TAK-TKA38580","price":3403.4,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka38580_1_3.jpg?v=1786914236"},{"product_id":"takahashi-2-7-flattener-for-takahashi-toa-130s","title":"Takahashi TOA-35FL 2.7\" Flattener for TSA-120\/TOA-130\/TOA-150B","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-35FL is Takahashi's 2.7-inch field flattener for the TSA-120 and TOA-130\/150 triplet apochromats. It threads onto a 2-inch drawtube and presents a 2-inch female output, correcting the field to a 40mm image circle with essentially no edge distortion, at a published weight of 200 g.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own a TSA-120, TOA-130NS\/NFB, or TOA-150B and are imaging with a CCD or CMOS sensor up to full-frame, where corner star shape needs correcting that the native triplet design does not fully address on its own.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShared across three telescopes:\u003c\/strong\u003e the same part flattens the field on the TSA-120, TOA-130NS\/NFB, and TOA-150B, each with its own resulting focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40mm corrected image circle:\u003c\/strong\u003e covers virtually all common CCD and CMOS sensor sizes without edge-of-field distortion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e117.5mm back focus\u003c\/strong\u003e held constant across all three host telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact 2-inch in-line design:\u003c\/strong\u003e 60mm diameter, 74mm long, 200g.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA and TSA triplet apochromats are corrected for a flat visual field but benefit from a dedicated flattener when imaging across a full sensor. The TOA-35FL sits between the 2-inch drawtube and the camera train, trimming the focal length by a small, telescope-specific amount while holding the 40mm image circle and 117.5mm back focus fixed regardless of which of the three host telescopes it is mounted on.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA31582_TOA-35FL_schema.png?v=1786913972\" alt=\"Dimensional diagram of the Takahashi TOA-35FL 2.7 inch Flattener\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFull-frame and APS-C deep-sky imaging on the TSA-120, TOA-130NS\/NFB, or TOA-150B where flat corner stars are required across the sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this flattener for three telescopes.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith TOA-35FL\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTSA-120\u003c\/td\u003e\n\u003ctd\u003e900mm f\/7.5\u003c\/td\u003e\n\u003ctd\u003e880mm f\/7.3\u003c\/td\u003e\n\u003ctd\u003eΦ40mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-130NS \/ TOA-130NFB\u003c\/td\u003e\n\u003ctd\u003e1000mm f\/7.7\u003c\/td\u003e\n\u003ctd\u003e980mm f\/7.5\u003c\/td\u003e\n\u003ctd\u003eΦ40mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-150B\u003c\/td\u003e\n\u003ctd\u003e1100mm f\/7.3\u003c\/td\u003e\n\u003ctd\u003e1080mm f\/7.2\u003c\/td\u003e\n\u003ctd\u003eΦ40mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eFor sensors larger than 40mm, Takahashi's TOA-645 flattener line covers TOA-130 and TOA-150B with a 60mm image circle instead — see the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing picture.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003e40mm image circle, not full-format:\u003c\/strong\u003e larger sensors needing a 60mm circle should look to the TOA-645 flattener line instead of this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuilt for imaging:\u003c\/strong\u003e the flattened field has no benefit for eyepiece observing, where the native triplet field is already flat enough.\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 threads onto the 2-inch drawtube and presents a fixed 117.5mm back focus on the camera side, so there is no spacing to calculate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFlat-field deep-sky imaging on the TSA-120, TOA-130NS\/NFB, or TOA-150B.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it fit sensors larger than APS-C?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIts 40mm image circle covers most full-frame sensors; for larger formats, Takahashi's TOA-645 flattener (60mm circle) is the better match — send us your sensor size and we will confirm which one you need.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the same part used on all three telescopes?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — one flattener, with a slightly different resulting focal length on each host telescope.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-35FL is a single 2.7-inch flattener that corrects the field to a 40mm image circle at a fixed 117.5mm back focus across the TSA-120, TOA-130NS\/NFB, and TOA-150B.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047117836399,"sku":"TAK-TKA31582","price":659.23,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA31582_1.jpg?v=1786914243"},{"product_id":"takahashi-multi-ca-ring-65d","title":"Takahashi Multi CA Ring 65D","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Multi CA Ring 65D is a camera adapter ring in Takahashi's FCT-65D conversion lens system, used to complete the mechanical connection between the FCT-65D's reducers or flatteners and a camera adapter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis ring suits FCT-65D owners assembling an imaging train with the 65D FU Reducer 0.65x or the FC\/FS Multi Flattener 1.04x, where the published system charts call for this ring as part of the mechanical path.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurpose-built for the FCT-65D system:\u003c\/strong\u003e part of Takahashi's published conversion lens chart for this telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple mechanical ring:\u003c\/strong\u003e no optical elements — it exists purely to complete the thread interface between adjacent parts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBuilding out an FCT-65D imaging train alongside the 65D FU Reducer 0.65x or the FC\/FS Multi Flattener 1.04x, where the ring is called for in Takahashi's system chart.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eUsed within the FCT-65D conversion lens system, alongside the 65D FU Reducer 0.65x and FC\/FS Multi Flattener 1.04x. If you're unsure whether your specific FCT-65D imaging train needs this ring, send us your setup and we'll confirm the fit with you. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for spacing across the full system.\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's a simple mechanical ring that threads into place within the FCT-65D system chart alongside your reducer or flattener.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eCompleting the mechanical connection in an FCT-65D imaging train that uses the 65D FU Reducer or FC\/FS Multi Flattener.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it affect the optical path?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's a mechanical ring with no lens elements of its own.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe FCT-65D reducer or flattener it's paired with, plus your camera's own adapter to complete the train — send us your setup and we'll confirm what's needed.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA mechanical camera adapter ring in the FCT-65D conversion lens system, used alongside the telescope's reducers and flatteners to complete the imaging train.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047117869167,"sku":"TAK-TKA11203","price":61.49,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka11203-1.jpg?v=1786914260"},{"product_id":"teq0001-extender-q-1-6x-extender-for-takahashi-fsq-106","title":"Takahashi Extender-Q 1.6X for FSQ-106 (Fluorite) and Sky-90","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Extender-Q is a five-element 1.6x tele-extender built for Takahashi's original fluorite FSQ-106 and Sky-90 Petzval refractors. Screwed into the focuser drawtube, it works as a 1.6x visual Barlow and as a photographic and CCD tele-extender, accepting standard 1.25-inch eyepieces and diagonals, with internal threading for filters and an optional upgrade path to 2-inch accessories.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own the original fluorite FSQ-106 or a Sky-90 and want more focal length for lunar, planetary, or small-target imaging, or higher-power visual observing, from a telescope you already own.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFive-element optical design:\u003c\/strong\u003e functions as both a 1.6x visual Barlow and a photographic tele-extender.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25-inch accessory compatibility:\u003c\/strong\u003e accepts standard eyepieces and diagonals, with an internal filter thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch upgrade path:\u003c\/strong\u003e an optional adapter extends compatibility to 2-inch accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect drawtube mount:\u003c\/strong\u003e screws straight into the focuser, no separate adapter required on the FSQ-106 or Sky-90.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis extender serves the earlier fluorite FSQ-106 and the Sky-90 rather than the current FSQ-106EDX4. On the fluorite FSQ-106 it brings the focal ratio from f\/5 to f\/8; on the Sky-90, from f\/5.56 to f\/8.9. Takahashi publishes the resulting focal ratios for both pairings.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eHigher-magnification lunar and planetary imaging and visual observing on an original fluorite FSQ-106 or Sky-90.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is the extender for the \u003cstrong\u003eoriginal fluorite FSQ-106 and Sky-90\u003c\/strong\u003e — both earlier Takahashi models. It is explicitly \u003cstrong\u003enot compatible with the current FSQ-106EDX4\u003c\/strong\u003e (\"New Q\"); that telescope uses the separate Extender-QE 1.6x, which Ontario Telescope also carries. If you are not sure which FSQ-106 generation you own, send us the tube's markings or serial plate and we will confirm the right extender. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for general spacing reference.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot for the FSQ-106EDX4:\u003c\/strong\u003e the current \"New Q\" telescope requires the Extender-QE 1.6x instead of this part.\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 screws directly into the focuser drawtube on the FSQ-106 or Sky-90, with no separate adapter needed for the base 1.25-inch configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigher-power lunar, planetary, and visual work on the original fluorite FSQ-106 or Sky-90.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this fit my FSQ-106EDX4?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — the FSQ-106EDX4 uses the Extender-QE 1.6x, a different part built for the New Q's 2-inch focuser and 44mm image circle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for imaging as well as visual?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — Takahashi describes it as both a visual Barlow and a photographic tele-extender.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Extender-Q 1.6x is the matched tele-extender for the original fluorite FSQ-106 and Sky-90, bringing both to roughly f\/8 for higher-power imaging and visual work, with an eyepiece-ready 1.25-inch interface and an optional path to 2-inch accessories.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047118983279,"sku":"TAK-TKA00595","price":690.69,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/teq0001_1_2_5.jpg?v=1786914282"},{"product_id":"takahashi-mcr300-short-aux-ring","title":"Takahashi MCR300 Short Aux Ring","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe MCR300 Short Aux Ring is a short auxiliary spacer ring in Takahashi's Mewlon-CR reducer accessory family, the same group of parts that includes the Reducer-CR (CCA-250 \/ Mewlon CRS \/ FSQ-106EX4) and the 645 Reducer-CA. It's a mechanical spacer, not an optical element.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis ring suits owners already working within the Mewlon-CR \/ CCA reducer accessory system who need a short spacer to complete their specific imaging train configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShort auxiliary spacer:\u003c\/strong\u003e adds a fixed, short length within the Mewlon-CR reducer system's mechanical chain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple mechanical ring:\u003c\/strong\u003e no optical elements — it exists purely to set spacing between adjacent parts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFine-tuning spacing within a Mewlon-CR \/ CCA-250 reducer imaging train where a short auxiliary ring is called for.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIt sits within the same accessory family as the Reducer-CR (CCA-250 \/ Mewlon CRS \/ FSQ-106EX4) and the 645 Reducer-CA 0.72x. If you're assembling a Mewlon-CR imaging train and aren't sure whether this ring is the right spacer for your setup, send us your telescope and camera configuration and we'll confirm the fit with you before you order. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for spacing figures across the Takahashi system.\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's a simple mechanical spacer that threads into place within a Mewlon-CR reducer imaging train.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eCompleting spacing within a Mewlon-CR \/ CCA-250 reducer imaging train.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it affect the optical path?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it's a mechanical ring with no lens elements of its own.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe Mewlon-CR reducer your train is built around, plus your camera's own adapter — send us your setup and we'll confirm what's needed.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA short mechanical auxiliary ring within Takahashi's Mewlon-CR reducer accessory family, used to complete spacing in a CCA-250 \/ Mewlon-CR imaging train.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047119016047,"sku":"TAK-TKP83001","price":65.78,"currency_code":"CAD","in_stock":false}]},{"product_id":"texdx0001-fsq-85-extender-ed","title":"Takahashi EX ED 1.5x Extender for FSQ-85EDX","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe EX ED 1.5x is a 2-inch barrel extender built around extra-low-dispersion glass for the FSQ-85EDX, Takahashi's BabyQ Petzval astrograph. It brings the native 450mm f\/5.3 up to 680mm f\/8.0 while holding a 44mm corrected image circle, functioning as both a magnifying Barlow for visual use and a tele-extender for imaging.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own the FSQ-85EDX and want tighter framing on smaller deep-sky targets — planetary nebulae, galaxies, globular clusters — than the astrograph's native wide field delivers, without losing the ED-corrected color performance.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eED glass element:\u003c\/strong\u003e extra-low-dispersion glass controls chromatic aberration through the extended path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.5x magnification:\u003c\/strong\u003e 450mm f\/5.3 becomes 680mm f\/8.0 on the FSQ-85EDX.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm image circle held constant:\u003c\/strong\u003e the extended focal length stays corrected rather than trading correction for reach.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch barrel interface:\u003c\/strong\u003e mounts directly to the FSQ-85EDX's 2-inch drawtube and doubles as a visual Barlow.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-85EDX's four-element Petzval design is corrected natively at 450mm f\/5.3 for wide-field framing. The EX ED 1.5x adds a low-dispersion element ahead of the focuser to extend the focal length to 680mm at f\/8.0 while holding the 44mm image circle and 117.5mm back focus that the astrograph is designed around, rather than simply magnifying and letting the corners degrade.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTighter deep-sky framing on the FSQ-85EDX — small galaxies, planetary nebulae, and globular clusters — and higher-magnification visual or lunar\/planetary use when stacked with the TOA-35FL flattener on a TSA-120, TOA-130NS\/NFB, or TOA-150B.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this extender on its own for the FSQ-85EDX, and stacked with the TOA-35FL flattener for three additional telescopes.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eConfiguration\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eResulting\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-85EDX (alone)\u003c\/td\u003e\n\u003ctd\u003e450mm f\/5.3\u003c\/td\u003e\n\u003ctd\u003e680mm f\/8.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTSA-120 + TOA-35FL\u003c\/td\u003e\n\u003ctd\u003e900mm f\/7.5\u003c\/td\u003e\n\u003ctd\u003e1350mm f\/11.3\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-130NS\/NFB + TOA-35FL\u003c\/td\u003e\n\u003ctd\u003e1000mm f\/7.7\u003c\/td\u003e\n\u003ctd\u003e1500mm f\/11.5\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-150B + TOA-35FL\u003c\/td\u003e\n\u003ctd\u003e1100mm f\/7.3\u003c\/td\u003e\n\u003ctd\u003e1650mm f\/11.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eFor the stacked configurations, the TOA-35FL flattener is a separate part Ontario Telescope also carries. Full spacing detail is in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eStacked use needs the TOA-35FL separately:\u003c\/strong\u003e the TSA-120\/TOA-130\/TOA-150B figures above require both parts together, not this extender alone.\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 threads onto the FSQ-85EDX's 2-inch drawtube directly, with the 117.5mm back focus fixed by the unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTighter deep-sky framing on the FSQ-85EDX, and longer-focal-length imaging on TOA\/TSA triplets when paired with the TOA-35FL.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work as a visual Barlow too?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — the same 2-inch barrel design functions as a 1.5x magnifier for eyepiece use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it on my TOA-130 without the TOA-35FL?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi's published figures for the TOA\/TSA telescopes are for the extender stacked with the TOA-35FL flattener; send us your setup and we will confirm what the pairing does for your specific train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe EX ED 1.5x brings the FSQ-85EDX to 680mm at f\/8.0 with its 44mm image circle intact, and extends further reach to the TSA-120 and TOA-130\/150B line when stacked with the TOA-35FL flattener.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047119310959,"sku":"TAK-TKA37595","price":696.41,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/texdx0001_4_2_6.jpg?v=1786914324"},{"product_id":"mcr0015-mewlon-cr-extender-1-5x","title":"Takahashi Mewlon CR Extender 1.5x","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Mewlon CR Extender 1.5x is Takahashi's magnifying extender for the CCA-250 and the Mewlon-250CRS and Mewlon-300CRS Cassegrains. Depending on the host telescope it stretches the native focal length by roughly 1.5x, reaching as far as f\/15.1 on the Mewlon-250CRS for high-resolution planetary and lunar 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 own a CCA-250, Mewlon-250CRS, or Mewlon-300CRS and want the longest reach those telescopes can offer — high-resolution lunar and planetary imaging, or high-power visual observing, beyond their already long native focal ratios.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShared across three telescopes:\u003c\/strong\u003e one part, with the resulting focal length and ratio set by which Cassegrain it is mounted on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm image circle\u003c\/strong\u003e on the Mewlon-250CRS and Mewlon-300CRS; 40mm on the CCA-250.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e117.5mm back focus\u003c\/strong\u003e held constant across all three telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong-ratio result:\u003c\/strong\u003e from f\/7.5 on the CCA-250 up to f\/15.1 on the Mewlon-250CRS.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CCA-250, Mewlon-250CRS, and Mewlon-300CRS are already long-focus Cassegrain designs; the EX CR1.5x extends each further rather than correcting or reducing. Because the multiplier interacts with the native focal ratio of each telescope, the resulting f-ratio differs meaningfully across the line — f\/7.5 on the CCA-250's faster native f\/5.0, up to f\/15.1 on the Mewlon-250CRS's f\/10.0 — while the back focus stays fixed at 117.5mm on all three.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eHigh-resolution lunar and planetary imaging, and double-star and high-power visual observing, on the CCA-250, Mewlon-250CRS, or Mewlon-300CRS.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this extender for three telescopes.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith EX CR1.5x\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCCA-250\u003c\/td\u003e\n\u003ctd\u003e1250mm f\/5.0\u003c\/td\u003e\n\u003ctd\u003e1880mm f\/7.5\u003c\/td\u003e\n\u003ctd\u003eΦ40mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMewlon-250CRS\u003c\/td\u003e\n\u003ctd\u003e2500mm f\/10.0\u003c\/td\u003e\n\u003ctd\u003e3780mm f\/15.1\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMewlon-300CRS\u003c\/td\u003e\n\u003ctd\u003e2960mm f\/9.9\u003c\/td\u003e\n\u003ctd\u003e4475mm f\/14.9\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe same three telescopes also take the companion Reducer-CR 0.73x, which Ontario Telescope carries separately, for the opposite trade-off. Spacing detail is in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eLong focal ratios reduce image brightness per unit time:\u003c\/strong\u003e f\/15.1 on the Mewlon-250CRS trades exposure speed for resolution, which suits planetary lucky-imaging more than faint deep-sky targets.\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 threads to the rear cell with a fixed 117.5mm back focus on all three host telescopes, so there is no spacing to work out.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigh-resolution lunar and planetary imaging, and high-power visual observing, on the CCA-250 or Mewlon CRS line.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the same part fit all three telescopes?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — one extender, with a different resulting focal length and ratio depending on the host.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs there an opposite option for wider fields?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — the Reducer-CR 0.73x fits the same three telescopes and reduces rather than extends; send us your target list and we can help you pick between them.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Mewlon CR Extender 1.5x stretches the CCA-250, Mewlon-250CRS, and Mewlon-300CRS to their longest published focal ratios — up to f\/15.1 — for high-resolution lunar and planetary work.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047119605871,"sku":"TAK-TKA82595","price":696.41,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka82595_2_6.jpg?v=1786914378"},{"product_id":"takahashi-extender-qe-1-6x-2-field-flattener","title":"Takahashi Extender-QE 1.6x 2\" Field Flattener for FSQ-106EDX4","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Extender-QE 1.6x is the five-element 2-inch extender built specifically for Takahashi's current FSQ-106EDX4 (\"New Q\") refractor, also published for the FSQ-130ED. It brings the FSQ-106EDX4's native 530mm f\/5.0 up to 850mm f\/8.0 while holding a flat, colour-corrected 44mm image circle, and doubles as a high-magnification visual accessory.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own an FSQ-106EDX4 or FSQ-130ED and want tighter framing on small deep-sky targets than the astrograph's native wide field delivers, or higher-power lunar and planetary views without switching telescopes.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFive-element optical design:\u003c\/strong\u003e delivers a flat, colour-corrected, high-contrast image at the extended focal length rather than a simple magnifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.6x extension:\u003c\/strong\u003e 530mm f\/5.0 becomes 850mm f\/8.0 on the FSQ-106EDX4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm image circle held constant\u003c\/strong\u003e at the extended focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure mounting features:\u003c\/strong\u003e an anti-slip groove and dual thumbscrews keep the extender seated through the imaging or visual session.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated optics\u003c\/strong\u003e for high-contrast imaging and visual use alike.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBuilt for the FSQ-106EDX4's New Q focuser, the Extender-QE 1.6x uses a five-element design rather than a simple Barlow doublet, which is why the image circle stays a corrected 44mm at the extended 850mm f\/8.0 rather than degrading toward the edges the way a plain magnifier would. Takahashi also publishes the same part for the FSQ-130ED, where it extends 650mm f\/5.0 to 1040mm f\/8.0.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTighter deep-sky framing on the FSQ-106EDX4 or FSQ-130ED, plus higher-magnification lunar and planetary visual observing without short-eye-relief eyepieces.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this extender for two current telescopes.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith Extender-QE 1.6x\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-106EDX4 (New Q)\u003c\/td\u003e\n\u003ctd\u003e530mm f\/5.0\u003c\/td\u003e\n\u003ctd\u003e850mm f\/8.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-130ED\u003c\/td\u003e\n\u003ctd\u003e650mm f\/5.0\u003c\/td\u003e\n\u003ctd\u003e1040mm f\/8.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThis is the part for the current FSQ-106EDX4; the earlier fluorite FSQ-106 and Sky-90 use the separate Extender-Q 1.6x, also carried by Ontario Telescope. For spacing your full imaging train, see the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot the same part as the original Extender-Q:\u003c\/strong\u003e the earlier fluorite FSQ-106 and Sky-90 need the separate Extender-Q 1.6x rather than this one.\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 seats into the 2-inch focuser with an anti-slip groove and dual thumbscrews, and the 117.5mm back focus is fixed by the unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTighter deep-sky framing and higher-power lunar\/planetary imaging on the FSQ-106EDX4 or FSQ-130ED.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this fit an older fluorite FSQ-106?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — that telescope uses the separate Extender-Q 1.6x. Send us your FSQ-106's markings if you are not certain which generation you have and we will confirm the right part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing as well as imaging?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — it functions as a high-magnification visual accessory in addition to a photographic extender.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Extender-QE 1.6x extends the FSQ-106EDX4 to 850mm at f\/8.0 with a flat, colour-corrected 44mm image circle, and does the same for the FSQ-130ED at 1040mm f\/8.0.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047120752751,"sku":"TAK-TKA36595","price":772.2,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tsq0106qe_2_6.jpg?v=1786914418"},{"product_id":"takahashi-reducer-c-0-72x-for-the-fs-60cb","title":"Takahashi Reducer-C 0.72x for FS-60CB and FS-60Q","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer-C 0.72x is Takahashi's wide-field reducer for the FS-60 platform, dedicated to the FS-60CB, FS-60Q, and the earlier FS-60 models. On the FS-60CB it takes the native 355mm f\/5.9 down to roughly 255mm at f\/4.2, correcting a 40mm image circle at a fixed 56.2mm back focus. It weighs 180 g and adds 48 mm of length ahead of the sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own an FS-60CB or FS-60Q and want a faster, wider field for extended deep-sky exposures — nebula and Milky Way framing where the native focal length is already narrower than most refractors but you want it faster still.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.72x reduction:\u003c\/strong\u003e speeds up the FS-60CB from f\/5.9 to roughly f\/4.2 for wide-field imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40mm corrected image circle\u003c\/strong\u003e at a fixed 56.2mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM56 x 0.75 input, M52 x 0.75 output:\u003c\/strong\u003e a compact 48mm-long in-line unit weighing 180 g.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect camera mounting:\u003c\/strong\u003e supports direct DSLR attachment via a brand-specific T-ring, or CMOS\/CCD cameras with a filter wheel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FS-60 platform's native 355mm f\/5.9 (FS-60CB) is already a compact wide-field configuration; the Reducer-C 0.72x speeds it up further for shorter exposure times per unit of signal, at the cost of some focal length reach. Threaded between the drawtube's M56 x 0.75 female mount and an M52 x 0.75 camera-side output, the reducer holds a 40mm image circle and a fixed 56.2mm back focus, which is also published for the FS-60Q at its own native focal length.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA20580B_ReducerC_schema.png?v=1786913972\" alt=\"Dimensional diagram of the Takahashi Reducer-C 0.72x for FS-60CB\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field nebula and Milky Way imaging on the FS-60CB or FS-60Q, and extended-exposure deep-sky work where a faster focal ratio shortens total integration time.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi dedicates this reducer to the FS-60 platform.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith Reducer-C 0.72x (calculated)\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-60CB\u003c\/td\u003e\n\u003ctd\u003e355mm f\/5.9\u003c\/td\u003e\n\u003ctd\u003e~256mm f\/4.2\u003c\/td\u003e\n\u003ctd\u003eΦ40mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFS-60Q\u003c\/td\u003e\n\u003ctd\u003e600mm f\/10.0\u003c\/td\u003e\n\u003ctd\u003e~432mm f\/7.2\u003c\/td\u003e\n\u003ctd\u003eΦ40mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe FS-60CB figures are Takahashi's own stated result (f\/5.9 to f\/4.2). The FS-60Q figure is calculated from that same published 0.72x factor applied to its native focal length. For thread and spacing detail across your full imaging train, see the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eA separate option from Takahashi's other FS-60CB reducer:\u003c\/strong\u003e Takahashi also publishes the RD NC0.85x for the same tube; the 0.72x here is the faster, wider-field alternative, not a replacement for it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuilt for imaging, not eyepiece use:\u003c\/strong\u003e the flattened, reduced field has no benefit for visual observing.\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 threads onto the FS-60's M56 x 0.75 drawtube thread and presents a fixed M52 x 0.75 output, so the 56.2mm back focus is set by the part itself.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field, faster-ratio deep-sky imaging on the FS-60CB or FS-60Q.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I mount a DSLR directly?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — a brand-specific T-ring threads to the M52 x 0.75 output, or a CMOS\/CCD camera can be mounted with a filter wheel in between.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it also work on the FS-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi states it is dedicated to the FS-60CB, FS-60Q, and earlier FS-60 models; send us your exact tube and we will confirm the fit before you order.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer-C 0.72x speeds the FS-60CB up to roughly f\/4.2 with a corrected 40mm image circle and a fixed 56.2mm back focus, at a compact 180 g.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047122063471,"sku":"TAK-TKA20580B","price":772.2,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka20580b_3.jpg?v=1786914460"},{"product_id":"takahashi-foa-60-extender-1-7xr","title":"Takahashi FOA-60 Extender 1.7XR","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FOA-60 Extender 1.7XR converts Takahashi's FOA-60 Ortho Apochromat to the same 900mm f\/15.0 configuration published for the dedicated FOA-60Q optical tube, with the image circle opening to 88mm and back focus extending to 208.1mm. It is built into the optical path the same way the FOA-60Q's factory objective is, rather than mounting on the drawtube as a Barlow would.\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 own the FOA-60 and want the FOA-60Q's long-focal-length performance — high-resolution lunar and planetary imaging and high-power visual observing — without buying a second optical tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConverts FOA-60 to FOA-60Q spec:\u003c\/strong\u003e 530mm f\/8.8 becomes 900mm f\/15.0, matching Takahashi's own FOA-60Q tube exactly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e88mm image circle\u003c\/strong\u003e at the extended focal length, with 208.1mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreserves the FOA-60's correction:\u003c\/strong\u003e Takahashi states the resulting system holds a Strehl ratio above 99% across nearly the full visible spectrum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupports high magnification:\u003c\/strong\u003e Takahashi rates it for visual magnifications up to 300x while keeping the image clean.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FOA-60's 60mm fluorite doublet objective is built for correction quality over field width; the 1.7XR extender lengthens the light path to 900mm at f\/15.0 — identical to the factory FOA-60Q configuration — while the doublet's inherent correction keeps the Strehl ratio high through the extended path. This is the same route Takahashi uses to build the FOA-60Q itself, applied to an FOA-60 already in the field.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eHigh-resolution lunar and planetary imaging, and high-magnification visual observing of the Moon, planets, and double stars, on an FOA-60.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this pairing for the FOA-60 specifically.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith EX 1.7xR\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFOA-60\u003c\/td\u003e\n\u003ctd\u003e530mm f\/8.8\u003c\/td\u003e\n\u003ctd\u003e900mm f\/15.0\u003c\/td\u003e\n\u003ctd\u003eΦ88mm\u003c\/td\u003e\n\u003ctd\u003e208.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe resulting figures match Takahashi's own FOA-60Q optical tube exactly. It is not combined with the FOA-60 0.93x Flattener, which serves the opposite, wide-field configuration of the same tube. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for general spacing reference.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot combined with the 0.93x Flattener:\u003c\/strong\u003e the two accessories serve opposite configurations of the FOA-60 and are not used together.\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 installs into the optical path the same way the FOA-60Q's factory objective assembly does, with the resulting 208.1mm back focus fixed by the conversion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eHigh-resolution lunar and planetary imaging and high-power visual observing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this make my FOA-60 an FOA-60Q?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eOptically, yes — the resulting focal length, ratio, image circle, and back focus match Takahashi's FOA-60Q tube exactly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I still use the FOA-60 at its native focal length afterward?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe extender is a conversion rather than a drop-in accessory; if you want to switch back and forth between native and extended configurations, send us your setup and we will confirm what that involves.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FOA-60 Extender 1.7XR turns an FOA-60 into the optical equivalent of Takahashi's FOA-60Q — 900mm at f\/15.0 with an 88mm image circle and 208.1mm of back focus, for high-resolution lunar and planetary work.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047122686063,"sku":"TAK-TKA28595","price":829.4,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA28595_1.jpg?v=1786914498"},{"product_id":"takahashi-toa-645-flattener-0-99x-for-toa-130ns-nfb","title":"Takahashi TOA-645 Flattener 0.99x for TOA-130NS\/NFB","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-645 Flattener is Takahashi's large-format field corrector for the TOA-130NS and TOA-130NFB, holding the focal length essentially unchanged at 990mm f\/7.6 while opening the corrected image circle to 60mm — large enough for today's bigger CMOS sensors. Two lens elements in two groups thread between M72 x 1 male and female interfaces, in a compact 78mm diameter, 42mm long, 265 g housing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own a TOA-130NS or TOA-130NFB and are imaging with a large-format CMOS sensor where the older 67-series flatteners and the 40mm-circle TOA-35FL fall short of full corner coverage.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e60mm corrected image circle:\u003c\/strong\u003e built for large modern CMOS sensors rather than the 40mm circle of the TOA-35FL.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNear-unity focal ratio change:\u003c\/strong\u003e 1000mm f\/7.7 native becomes 990mm f\/7.6 — correction with almost no reach traded away.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTight spot diagrams:\u003c\/strong\u003e Takahashi publishes 1 micron RMS on-axis, rising to 5 microns at the full 60mm diameter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM72 x 1 threads on both sides,\u003c\/strong\u003e in a compact 78mm x 42mm housing at 265 g.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWhere the TOA-35FL corrects the TOA-130NS\/NFB to a 40mm circle, the TOA-645 uses two lens elements in two groups to hold correction out to 60mm, addressing the larger sensor formats that have become common since the earlier 67-series flatteners were designed. Takahashi states the newer design performs nearly aberration-free with today's smaller pixel pitches, where the older flatteners show their age.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFull-frame and medium-format CMOS deep-sky imaging on the TOA-130NS or TOA-130NFB, where corner correction across a 60mm circle is required.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this flattener for the TOA-130NS\/NFB.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith TOA-645FL\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-130NS \/ TOA-130NFB\u003c\/td\u003e\n\u003ctd\u003e1000mm f\/7.7\u003c\/td\u003e\n\u003ctd\u003e990mm f\/7.6\u003c\/td\u003e\n\u003ctd\u003eΦ60mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe TOA-150B takes the same optical design in a separate kit, part TKA32587S, which Ontario Telescope lists separately — the two are not interchangeable at the mechanical level despite sharing the optical formula. For smaller-sensor use, the 40mm-circle TOA-35FL is also available. Full spacing detail is in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot interchangeable with the TOA-150B kit:\u003c\/strong\u003e that telescope uses its own TOA-645 flattener kit (TKA32587S) rather than this TOA-130-specific part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuilt for imaging:\u003c\/strong\u003e the corrected field has no benefit for eyepiece observing.\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 threads between M72 x 1 interfaces with a fixed 56.2mm back focus, so there is no spacing to calculate.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFull-frame and large-format CMOS deep-sky imaging on the TOA-130NS or TOA-130NFB.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the TOA-35FL?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe TOA-35FL corrects a 40mm image circle; the TOA-645 corrects out to 60mm for larger sensors, at nearly the same resulting focal length.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this fit my TOA-150B?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe TOA-150B uses its own TOA-645 flattener kit rather than this part; send us your telescope model and sensor size and we will confirm which flattener you need.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TOA-645 Flattener corrects the TOA-130NS\/NFB to a 60mm image circle at essentially its native 990mm f\/7.6, built for the large CMOS sensors that have outgrown the older 40mm-circle flatteners.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047124750447,"sku":"TAK-TKA31587S","price":958.1,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka31587s-1_3.jpg?v=1786914538"},{"product_id":"takahashi-rd-qb-0-73x-new-reducer-for-baby-q","title":"Takahashi RD-QB 0.73x Reducer for FSQ-85EDX (\"Baby-Q\")","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe RD-QB 0.73x is the current-generation reducer for the FSQ-85EDX, Takahashi's BabyQ Petzval astrograph. Built with four elements in two groups using a newer, highly refractive low-dispersion ED glass, it brings the native 450mm f\/5.3 down to 330mm f\/3.9 while holding a 44mm image circle that covers full-frame sensors.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own the FSQ-85EDX and want the widest, fastest field it can deliver — large nebula complexes, Milky Way fields, and wide star clusters on a full-frame sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.73x reduction:\u003c\/strong\u003e 450mm f\/5.3 becomes 330mm f\/3.9 on the FSQ-85EDX.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm image circle:\u003c\/strong\u003e covers full-frame digital sensors with the corrected field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew ED glass formula:\u003c\/strong\u003e four elements in two groups, an updated design over the earlier QE0.73x reducer with improved field curvature performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM72 x 1 input, M56 x 0.75 output\u003c\/strong\u003e threads, with an internal 58mm filter thread, in a compact 78 x 63mm, 520 g housing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-85EDX's four-element Petzval design is already corrected for a wide native field; the RD-QB 0.73x uses the newer low-dispersion ED formula to speed that field up to f\/3.9 while holding the 44mm image circle needed for full-frame coverage. Takahashi positions it as the direct successor to the earlier QE0.73x reducer, with better field curvature control at the same reduction factor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field, full-frame deep-sky imaging on the FSQ-85EDX — large nebula complexes, star clusters, and Milky Way fields where a fast, wide, flat field matters more than reach.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this reducer for the FSQ-85EDX.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith RD QB0.73x\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-85EDX\u003c\/td\u003e\n\u003ctd\u003e450mm f\/5.3\u003c\/td\u003e\n\u003ctd\u003e330mm f\/3.9\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e72.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eAn internal 58mm filter thread accepts common filter sizes without a separate holder. For spacing this reducer against your camera and filter wheel, see the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSupersedes the earlier QE0.73x reducer:\u003c\/strong\u003e if you are matching this against an older FSQ-85EDX system chart that references the QE0.73x, the resulting focal length and ratio are the same but the internal glass and field curvature performance differ.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBuilt for imaging, not eyepiece use:\u003c\/strong\u003e the reduced, flattened field has no benefit for visual observing.\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 threads onto the FSQ-85EDX's M72 x 1 drawtube and presents an M56 x 0.75 output with a fixed 72.2mm back focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field, full-frame deep-sky imaging on the FSQ-85EDX.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it accept filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — a 58mm internal filter thread is built into the unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this the same as the older QE0.73x reducer?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt reduces to the same 330mm f\/3.9, but uses a newer ED glass formula with better field curvature control — send us your current setup if you are upgrading and we will confirm compatibility.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe RD-QB 0.73x brings the FSQ-85EDX to a wide, fast 330mm f\/3.9 with a full-frame-covering 44mm image circle and a fixed 72.2mm back focus, at 520 g.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047127928943,"sku":"TAK-TKA37580","price":972.4,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka37580-1.jpg?v=1786914575"},{"product_id":"takahashi-mewlon-cr-fsq106edx4-0-73x-reducer","title":"Takahashi Reducer-CR 0.73x for Mewlon CRS, CCA-250 and FSQ-106EDX4","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer-CR 0.73x is Takahashi's focal reducer for the CCA-250 and the Mewlon-250CRS and Mewlon-300CRS Cassegrains, trading some of each telescope's long native reach for a meaningfully faster, more deep-sky-friendly focal ratio. On the CCA-250 it brings the system down to f\/3.6; on the Mewlon-250CRS and Mewlon-300CRS, to f\/7.3 and f\/7.2 respectively.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own a CCA-250, Mewlon-250CRS, or Mewlon-300CRS and want a faster system for deep-sky imaging than the native long-focus Cassegrain configuration provides.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShared across three Cassegrains:\u003c\/strong\u003e one part, with the resulting focal length and ratio set by which telescope it is mounted on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeaningful speed gain:\u003c\/strong\u003e the CCA-250 goes from f\/5.0 native to f\/3.6; the Mewlon CRS pair drop from roughly f\/10 native into the f\/7 range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e38–35mm image circle\u003c\/strong\u003e depending on host telescope, with a matched back focus for each.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe CCA-250, Mewlon-250CRS, and Mewlon-300CRS are Dall-Kirkham and related Cassegrain designs built natively for long-focus planetary and lunar work. The Reducer-CR 0.73x shortens the effective focal length on each by roughly the same 0.73x factor, but because their native ratios differ, the resulting speed gain is most dramatic on the CCA-250 (f\/5.0 to f\/3.6) and more moderate on the two Mewlon CRS models (f\/9.9–f\/10.0 down to roughly f\/7.2–f\/7.3).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFaster deep-sky imaging on the CCA-250, Mewlon-250CRS, or Mewlon-300CRS — galaxies, planetary nebulae, and globular clusters where the native long-focus configuration would otherwise demand long exposures.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this reducer for three telescopes, with a fourth pairing available through an additional adapter.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eWith RD CR0.73x\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCCA-250\u003c\/td\u003e\n\u003ctd\u003e1250mm f\/5.0\u003c\/td\u003e\n\u003ctd\u003e910mm f\/3.6\u003c\/td\u003e\n\u003ctd\u003eΦ38mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMewlon-250CRS\u003c\/td\u003e\n\u003ctd\u003e2500mm f\/10.0\u003c\/td\u003e\n\u003ctd\u003e1825mm f\/7.3\u003c\/td\u003e\n\u003ctd\u003eΦ35mm\u003c\/td\u003e\n\u003ctd\u003e72.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMewlon-300CRS\u003c\/td\u003e\n\u003ctd\u003e2960mm f\/9.9\u003c\/td\u003e\n\u003ctd\u003e2160mm f\/7.2\u003c\/td\u003e\n\u003ctd\u003eΦ35mm\u003c\/td\u003e\n\u003ctd\u003e72.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eTakahashi also lists this reducer as compatible with the FSQ-106EDX4 when used with the separate CA35 (SKY90)-style adapter, part TKA35201. The same three Cassegrains also take the companion Mewlon CR Extender 1.5x, which Ontario Telescope carries separately, for the opposite trade-off. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for spacing detail.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eFSQ-106EDX4 use needs a separate adapter (TKA35201).\u003c\/strong\u003e\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 threads to the rear cell with a fixed back focus on each host telescope, so there is no spacing to work out on the CCA-250 or Mewlon CRS pairings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFaster deep-sky imaging on the CCA-250, Mewlon-250CRS, or Mewlon-300CRS.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the same part fit all three Cassegrains?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — one reducer, with a different resulting focal length, ratio, and image circle depending on the host telescope.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it on my FSQ-106EDX4?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi notes compatibility with a separate adapter (TKA35201).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer-CR 0.73x speeds up the CCA-250, Mewlon-250CRS, and Mewlon-300CRS for deep-sky imaging — down to f\/3.6 on the CCA-250 and into the f\/7 range on the Mewlon CRS pair — and extends to the FSQ-106EDX4 with an additional adapter.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047128420463,"sku":"TAK-TKA82580","price":986.7,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka82580-2_6.jpg?v=1786914613"}],"url":"https:\/\/ontariotelescope.com\/collections\/takahashi-reducers-flatteners-extenders.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}