{"title":"Takahashi FSQ","description":"\u003cp\u003eThe Takahashi FSQ line, listed by aperture. Part of \u003ca href=\"\/collections\/takahashi-telescopes\"\u003eTakahashi Telescopes\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"takahashi-fsq-80fc-80mm-f-5-6-quintuplet-astrograph-refractor-ota","title":"Takahashi FSQ-80FC 80mm f\/5.6 Quintuplet Astrograph Refractor OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-80FC is Takahashi's compact 80 mm imaging refractor, built around a 5-element optical design with dual fluorite elements. At a native 450 mm focal length and f\/5.6, it is intended as a wide-field astrograph rather than a visual scope — the flat field and 50 mm image circle cover a full-frame sensor without a separate flattener. Takahashi lists a tube weight of approximately 4.1 kg.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want a wide-field, grab-and-go imaging refractor that travels light — the compact tube and roughly 4.1 kg weight suit a smaller equatorial mount or a travel setup, and the flat 50 mm image circle covers full-frame sensors without an accessory flattener to buy separately.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-element optical design with dual fluorite elements:\u003c\/strong\u003e corrects chromatic aberration and field curvature within the tube, without a separate corrector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e450 mm focal length at f\/5.6:\u003c\/strong\u003e a fast, wide field of view suited to nebulae, star clusters and large-scale mosaic targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50 mm image circle:\u003c\/strong\u003e covers full-frame sensors with a flat field, as published by Takahashi.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNative M48 interface with 55 mm back focus:\u003c\/strong\u003e supports direct camera attachment with minimal adapter stacking, reducing flexure in the imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetracting dew shield:\u003c\/strong\u003e tube length runs 486 mm retracted to 559 mm extended for storage and transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack-and-pinion focuser:\u003c\/strong\u003e holds a full imaging train of camera, filter wheel and guider.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-80FC carries Takahashi's quintuplet Petzval-derived design — five elements including two fluorite lenses — aimed at flattening the field and correcting color across the frame without a separate flattener accessory. At f\/5.6 and 450 mm focal length it trades focal length for field width and speed, the combination astrographs are built around. The aluminum tube and fully multi-coated optics are typical of the FSQ line's imaging-first design; where Takahashi's other refractors are sold as visual-capable OTAs with an optional flattener, the FSQ-80FC's flattening is built into the base optical prescription.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide-field deep-sky astrophotography of nebulae, large star clusters and galaxy fields; full-frame mosaic imaging; travel and portable imaging rigs where tube weight and length matter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes a 55 mm back focus from the native M48 interface, which is enough to seat most cooled cameras directly or with a thin adapter stack — filter wheels and off-axis guiders add up quickly against that figure, so it is worth checking your full imaging train before ordering.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003ePublished weight is approximate:\u003c\/strong\u003e Takahashi's own listing states \"approx. 4.1 kg\" rather than an exact figure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMount and tripod are not included:\u003c\/strong\u003e this listing is the optical tube assembly only.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — the flattening is built into the optics, so there is no separate corrector to thread on and space out. The M48 interface accepts a camera directly once your adapter stack is sorted.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field deep-sky astrophotography where a fast, short-focal-length refractor covers more sky per frame than a longer telescope.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is built and marketed as an imaging astrograph; its native interface and back focus are set for a camera, not an eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat cameras does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAny camera that reaches the 55 mm back focus through the M48 interface, including full-frame cooled CMOS and CCD cameras — send us your camera and filter setup and we will work it out with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is this different from the FSQ-85EDX?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThey are separate optical designs, each on its own specification sheet — figures for one do not describe the other.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a compact 80 mm f\/5.6 quintuplet astrograph with a built-in flattener, a 50 mm image circle, and roughly 4.1 kg of travel-friendly weight, built for wide-field imaging over visual use.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047049384047,"sku":"TAK-TQE08041","price":6176.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/fsq-80fc_-1-1024x576_jpg.png?v=1786911606"},{"product_id":"takahashi-fsq-85edx-babyq-85mm-f-5-3-petzval-astrograph-ota-with-1-01x-flattener","title":"Takahashi FSQ-85EDX BabyQ 85mm f\/5.3 Petzval Astrograph OTA with 1.01x Flattener","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-85EDX — known as the BabyQ — is Takahashi's 85 mm Petzval quadruplet astrograph, sold here as an optical tube assembly bundled with the 1.01x flattener. At 450 mm focal length and f\/5.3 in a 535–613 mm tube, it weighs 3.6 kg and covers a 44 mm image circle. With the included flattener fitted the system runs 455 mm at f\/5.4 with just 56.2 mm of back focus, which is what makes the flattener worth bundling rather than buying separately.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want a small, genuinely flat-field quadruplet for wide-field deep-sky imaging — four elements in four groups control field curvature and colour across the full 44 mm circle without the compromises a doublet or triplet design makes at this speed. Its 3.6 kg weight and 535 mm collapsed length make it a strong travel astrograph, and the 50 mm drawtube extension gives the focuser room to work with different camera and filter-wheel combinations.\u003c\/p\u003e\u003cp\u003eVisual observers get a genuine apochromat at prime focus with a diagonal and eyepiece, though the FSQ-85EDX is built and priced around imaging. Tell us your camera and filter setup and we will confirm the flattener spacing works for your train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePetzval quadruplet:\u003c\/strong\u003e four elements in four groups, an ED apochromat design built to control field curvature and colour across a flat field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e450 mm at f\/5.3:\u003c\/strong\u003e in a 535–613 mm retractable tube, 95 mm across (114 mm dew shield).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.01x flattener included:\u003c\/strong\u003e 455 mm at f\/5.4, 44 mm corrected circle, 56.2 mm back focus — the configuration this kit is built around.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.6 kg:\u003c\/strong\u003e light enough for portable and travel mounts once a full imaging train is attached.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50 mm of drawtube extension\u003c\/strong\u003e for focus travel across different camera setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e197.5 mm of back focus at prime\u003c\/strong\u003e — before the flattener is fitted, ample room for accessories.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-85EDX objective is a four-element, four-group Petzval quadruplet built around ED glass — a design that inherently controls field curvature better than a doublet or triplet at the same speed, because the rear element group does the flattening work a separate corrector would otherwise need to do. The bundled 1.01x flattener refines that further, correcting the field to 44 mm at 455 mm and f\/5.4 with 56.2 mm of back focus — tight enough that camera spacing needs to be accurate, and generous enough that most imaging trains reach it without extension tubes.\u003c\/p\u003e\u003cp\u003eOther conversion options exist for the FSQ-85EDX platform — the RD QB 0.73x reducer brings it to 330 mm at f\/3.9, and the EX ED 1.5x extender to 680 mm at f\/8.0, both with the same 44 mm circle — though this kit is built and priced around the OTA-plus-flattener configuration.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide-field deep-sky imaging:\u003c\/strong\u003e at 455 mm and f\/5.4 with the included flattener, a 44 mm corrected circle across the frame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel astrophotography:\u003c\/strong\u003e a 535 mm collapsed tube and 3.6 kg weight suit portable rigs and checked baggage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaster, wider framing:\u003c\/strong\u003e with the RD QB 0.73x reducer (sold separately) at 330 mm and f\/3.9.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTighter framing:\u003c\/strong\u003e with the EX ED 1.5x extender (sold separately) at 680 mm and f\/8.0.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus is 197.5 mm at prime, dropping to 56.2 mm once the included 1.01x flattener is fitted — the figure your imaging train needs to hit. Takahashi's system charts for the base configuration, the RD QE 0.73x reducer and the EX ED 1.5x extender are in the Downloads tab, with the exact parts and distances for each. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects the same figures for the whole range in one table.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlattener:\u003c\/strong\u003e 1.01x, included in this kit — 455 mm at f\/5.4, 44 mm circle, 56.2 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReducer:\u003c\/strong\u003e RD QB 0.73x (sold separately), 330 mm at f\/3.9, 44 mm circle, 72.2 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtender:\u003c\/strong\u003e EX ED 1.5x (sold separately), 680 mm at f\/8.0, 44 mm circle, 117.5 mm back focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA with flattener — no mount, rings, dovetail, diagonal or eyepiece included. At 3.6 kg plus a full imaging train, most travel and mid-payload mounts handle it.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure your camera and filter thickness will reach 56.2 mm exactly, send us your imaging train and we will work out the spacing with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an optical tube assembly with the flattener included.\u003c\/strong\u003e Mount, rings, dovetail, diagonal and eyepiece are sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus with the flattener is tight.\u003c\/strong\u003e 56.2 mm is generous by imaging-train standards but still worth checking against your camera and filter wheel stack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe reducer and extender are sold separately.\u003c\/strong\u003e This kit bundles only the OTA and the 1.01x flattener; the RD QB 0.73x and EX ED 1.5x are additional purchases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTube length varies with the dew shield position.\u003c\/strong\u003e 535 mm retracted, 613 mm extended — worth accounting for in a case.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. The flattener is included and matched to the tube, so reaching the 56.2 mm back focus is mostly a matter of using the standard adapter stack. The published system chart in the Downloads tab confirms the exact parts, and we can check your specific camera train against it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field deep-sky imaging — nebulae, star fields and Milky Way regions — at 455 mm and f\/5.4 across a flat 44 mm circle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the kit include everything I need to image?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt includes the OTA and the 1.01x flattener. A mount, camera, and any filter wheel or guider are separate purchases.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it visually?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, at prime focus with a diagonal and eyepiece, though the telescope and this kit are built and priced around imaging use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between this and the reducer or extender configurations?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis kit is built around the 1.01x flattener at 455 mm and f\/5.4. The RD QB 0.73x reducer (330 mm, f\/3.9) and EX ED 1.5x extender (680 mm, f\/8.0) are separate accessories for wider or tighter framing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this not be the choice?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIf you need faster than f\/5.4 without buying the reducer separately, or a longer native focal length than 450 mm offers before adding the extender.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an 85 mm Petzval quadruplet astrograph and its matched 1.01x flattener, together giving 455 mm at f\/5.4 with a 44 mm corrected circle and 56.2 mm of back focus. It weighs 3.6 kg, collapses to 535 mm for travel, and is built for wide-field deep-sky imaging.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Diagram Reports\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes a spot diagram for the FSQ-85EDX with the 1.01x flattener fitted — the configuration this kit ships in — showing star images across the field at the design wavelengths.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FSQ-85EDX_FL101X_spots.png?v=1786911643\" alt=\"Takahashi FSQ-85EDX 85mm Petzval spot diagram with 1.01x flattener\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047058559087,"sku":"TAK-TQE08541","price":4851.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TQE08541_FSQ-85EDX_OTA_1.jpg?v=1786912043"},{"product_id":"takahashi-reducer-coupling-fsq-106ed-camera-angle-a","title":"Takahashi Reducer Coupling for FSQ-106ED Camera Angle A","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Reducer Coupling for FSQ-106ED Camera Angle A is a mechanical spacer built to seat the Mewlon CR \/ FSQ-106EDX4 0.73x Reducer inside the Camera Angle Adjuster on an FSQ-106ED telescope. It bridges the M92 and M72 thread interfaces of the CAA housing, positioning the reducer at the depth needed for infinity focus with Takahashi's standard TCA-4 and T-mount camera adapters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you run an FSQ-106ED with the Camera Angle Adjuster and want to add the 0.73x reducer to that same imaging train without changing your camera-side adapters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM92-to-M72 coupling:\u003c\/strong\u003e bridges the reducer's thread to the Camera Angle Adjuster's housing thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurpose-fit depth:\u003c\/strong\u003e positions the reducer inside the CAA at the spacing needed for infinity focus with standard TCA-4 and T-mount adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-purpose part:\u003c\/strong\u003e adds no optics of its own — it's a mechanical spacer only.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAdding the 0.73x reducer to an FSQ-106ED imaging train that already runs through the Camera Angle Adjuster; CCD and DSLR imaging setups using Takahashi's TCA-4 or T-mount camera adapters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBuilt specifically for the FSQ-106ED's Camera Angle Adjuster and the Mewlon CR \/ FSQ-106EDX4 0.73x Reducer. It isn't a general-purpose coupling for other Takahashi reducers or camera angle adjusters. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the rest of the FSQ-106ED imaging train's published spacing figures.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIt's built for one specific combination.\u003c\/strong\u003e It couples the 0.73x reducer to the FSQ-106ED's Camera Angle Adjuster and isn't sized for other reducer or CAA pairings.\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 the reducer and the Camera Angle Adjuster housing like any coupling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFitting the 0.73x reducer inside an FSQ-106ED's Camera Angle Adjuster for CCD or DSLR imaging.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work with other reducers or telescopes?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt's matched specifically to the FSQ-106ED Camera Angle Adjuster and the 0.73x reducer, not a universal coupling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need other adapters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eStandard TCA-4 or T-mount camera adapters complete the imaging train from this point.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA purpose-built coupling that seats the 0.73x reducer inside the FSQ-106ED's Camera Angle Adjuster at the correct depth for infinity focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047080677487,"sku":"TAK-TKA36002","price":77.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/trdc0106_2_6.jpg?v=1786913058"},{"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":199.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/screenshot_2026-08-26_at_2.00.51_pm.png?v=1787841798"},{"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":347.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TKA37582_1.jpg?v=1786914068"},{"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":2256.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka38581_2_6.jpg?v=1786914153"},{"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":3229.0,"currency_code":"CAD","in_stock":true}],"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":3356.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka38580_1_3.jpg?v=1786914236"},{"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":682.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/teq0001_1_2_5.jpg?v=1786914282"},{"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":687.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/texdx0001_4_2_6.jpg?v=1786914324"},{"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":762.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tsq0106qe_2_6.jpg?v=1786914418"},{"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":959.0,"currency_code":"CAD","in_stock":true}],"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":973.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka82580-2_6.jpg?v=1786914613"}],"url":"https:\/\/ontariotelescope.com\/collections\/takahashi-fsq.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}