{"title":"Takahashi Epsilon","description":"\u003cp\u003eThe Takahashi Epsilon line, listed by aperture. Part of \u003ca href=\"\/collections\/takahashi-telescopes\"\u003eTakahashi Telescopes\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"takahashi-epsilon-e-160ed-160mm-f-3-3-hyperbolic-astrograph-ota","title":"Takahashi Epsilon E-160ED 160mm f\/3.3 Hyperbolic Astrograph OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Epsilon-160ED is a 160 mm hyperbolic Newtonian astrograph from Takahashi, built for deep-sky imaging at a native f\/3.3. A hyperbolic primary mirror, flat secondary, and an integrated field-flattening corrector work together inside the tube, so there is no separate flattener to buy, align, or space out. The 530 mm focal length puts a flat 44 mm image circle 56.2 mm behind the focuser, and the published tube weight of 6.9 kg keeps it well inside the payload of a mid-size equatorial mount carrying a full imaging train.\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 deep-sky targets — nebulae, galaxies, and star clusters — and want the light-gathering speed of f\/3.3 without the curved focal plane and flat-field-adapter fuss of a Schmidt camera design. It suits an imager already comfortable with reflector collimation, since a Newtonian-derived optical path benefits from periodic checking. It is not built for eyepiece observing — the fast mirror and integrated flattener are optimized for a sensor at a fixed backfocus, not a diagonal and eyepiece.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHyperbolic primary + flat secondary + integrated flattener:\u003c\/strong\u003e corrects coma and field curvature inside the tube, with no separate corrector lens to purchase or space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ef\/3.3 native speed:\u003c\/strong\u003e a 530 mm focal length gathers light quickly, shortening exposure times for faint targets compared with a conventional f\/6–f\/8 reflector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44 mm image circle:\u003c\/strong\u003e covers full-frame and APS-C sensors, with the design holding spot size under roughly 3 micrometers at the field edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversized rack-and-pinion focuser with integrated Camera Angle Adjuster:\u003c\/strong\u003e lets you rotate the imaging train to frame a target without loosening the tube rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemovable central mirror cover:\u003c\/strong\u003e exposes the primary to ambient air for faster thermal acclimation before a session.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen spider-vane secondary support:\u003c\/strong\u003e reduces scattered light and diffraction spikes around bright stars.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Epsilon-160ED's optical path combines a 160 mm hyperbolic primary mirror with a flat secondary and a built-in multi-element field flattener, a configuration Takahashi calls a modified hyperbolic Newtonian. Unlike a Schmidt camera, the focal plane is flat and the corrective elements live inside the tube rather than as a separate accessory train, which keeps the back focus fixed at 56.2 mm from the focuser's rear end. At f\/3.3 the design cuts exposure times sharply against slower reflectors while holding the 44 mm image circle flat and coma-free. An optional Ɛ-EX 160ED extender changes the configuration to 800 mm at f\/5.0, with the same 44 mm image circle and 56.2 mm back focus, for imagers who want tighter framing on the same optical tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWide- to moderate-field deep-sky astrophotography of nebulae, galaxies and star clusters; narrowband and broadband imaging with a cooled CMOS or CCD camera; observatory or portable imaging rigs built around a fast reflector rather than a refractor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 56.2 mm back focus is measured from the rear end of the focuser to the focal plane and is fixed by the integrated flattener — there is no field-flattener spacing to calculate for prime focus imaging. Camera trains, filter drawers and off-axis guiders all need to fit inside that figure, so it is worth checking your full imaging stack against it before ordering. The \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e covers this and the Ɛ-EX 160ED extender configuration in detail. Because this is a Newtonian-derived design, periodic collimation is part of ownership — Takahashi's collimating tools work with this tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot built for eyepiece observing:\u003c\/strong\u003e the fast mirror and fixed-backfocus flattener are matched to a camera sensor, not a diagonal and eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCollimation is periodic maintenance, not a one-time setup:\u003c\/strong\u003e like any fast Newtonian-derived optic, the mirrors benefit from a collimation check after transport, and Takahashi's own collimating eyepiece and telescope handle it directly.\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\u003eThe optical side is straightforward — the flattener is built in, so there is no separate corrector to space out. The part that takes practice is collimation, which any fast Newtonian-derived design needs checked periodically; Takahashi's collimating tools are built for this tube.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDeep-sky astrophotography at a fast focal ratio — nebulae, galaxies and clusters that benefit from short sub-exposures at f\/3.3.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt has no real application in a visual eyepiece train; the flattener and back focus are set for a camera sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat cameras does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAny cooled CMOS or CCD astronomy camera that can reach the 56.2 mm back focus with its own nosepiece, filter wheel or off-axis guider included in that figure — 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 Epsilon-180ED?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe 180ED steps up to a 180 mm aperture and a faster f\/2.8, with a larger, heavier tube; the 160ED is the lighter, more mount-friendly option at f\/3.3.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 160 mm f\/3.3 hyperbolic astrograph with the flattener built in, delivering a flat 44 mm image circle at a fixed 56.2 mm back focus for fast deep-sky imaging.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047049285743,"sku":"TAK-TEK16010","price":5570.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TEK16010_1.jpg?v=1786911556"},{"product_id":"takahashi-epsilon-180ed-180mm-f-2-8-hyperbolic-flat-field-astrograph-ota","title":"Takahashi Epsilon 180ED 180mm f\/2.8 Hyperbolic Flat-Field Astrograph OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Epsilon-180ED is Takahashi's largest and fastest Epsilon astrograph, a 180 mm hyperbolic Newtonian design running at a native f\/2.8. A hyperbolic primary mirror, flat secondary, and an integrated field-flattening corrector combine inside the tube to put a flat 44 mm image circle 56.2 mm behind the focuser, with no separate corrector to buy or align. The published tube weight is 10.7 kg, putting it toward the upper end of what a mid-to-large equatorial mount should carry with a full imaging train attached.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if your priority is imaging speed — f\/2.8 gathers light quickly enough to shorten exposure times noticeably against slower optics, which matters most for faint, extended nebulosity. It suits an imager already running a fast reflector or astrograph, since the larger 180 mm mirror and 10.7 kg tube ask for a mount with real payload margin and benefit from a user comfortable checking collimation.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHyperbolic primary + flat secondary + integrated flattener:\u003c\/strong\u003e corrects coma and field curvature inside the tube, with no separate corrector to purchase or space.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ef\/2.8 native speed:\u003c\/strong\u003e among the fastest astrograph designs Takahashi builds, cutting exposure times sharply against conventional reflectors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44 mm image circle:\u003c\/strong\u003e covers full-frame and APS-C sensors with a flat field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack-and-pinion focuser with rotary framing and integrated Camera Angle Adjuster:\u003c\/strong\u003e rotates the imaging train to frame a target without loosening the tube rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccessible collimation with reference marks on both mirrors:\u003c\/strong\u003e makes checking and adjusting the optical alignment more direct than on a typical Newtonian.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Epsilon-180ED combines a 180 mm hyperbolic primary with a flat secondary and a built-in multi-element field flattener — the same modified-hyperbolic-Newtonian family as the smaller Epsilon-160ED, scaled up to a larger primary and a faster f\/2.8. Takahashi's own comparison places this design's chromatic performance below that of a conventional Schmidt camera at the same speed, while keeping the focal plane flat without a curved plate or field corrector as a separate purchase. Back focus is fixed at 56.2 mm from the focuser's rear end. An optional Ɛ-EX 180ED extender changes the configuration to 780 mm at f\/4.3, holding the same 44 mm image circle and 56.2 mm back focus, for imagers who want a longer effective focal length on the same tube.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFast deep-sky astrophotography of faint nebulae, galaxies and extended objects where exposure time matters; narrowband and broadband imaging with a cooled CMOS or CCD camera; observatory imaging setups built around a large, fast reflector.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 56.2 mm back focus is fixed by the integrated flattener and measured from the rear of the focuser to the focal plane — camera body, filter wheel and any off-axis guider all need to fit within that figure together. The \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e covers this figure and the Ɛ-EX 180ED extender configuration, and we're glad to check a specific camera and filter setup against it before you order. As a Newtonian-derived design, the mirrors benefit from a collimation check after transport, and the built-in reference marks make that a more direct process than on many reflectors.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot built for eyepiece observing:\u003c\/strong\u003e the fast mirror and fixed-backfocus flattener are matched to a camera sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eA larger mount than the Epsilon-160ED needs:\u003c\/strong\u003e at 10.7 kg published weight, this is a heavier tube than Takahashi's smaller Epsilon models and is worth checking against your mount's imaging payload rating, not just its rated visual capacity.\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\u003eThe flattener is built in, so there is no separate corrector to space out. Collimation is the part that takes practice on any fast Newtonian-derived design, and the reference marks on both mirrors here are built to make that check more direct.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFast deep-sky astrophotography where exposure time and light-gathering speed matter more than reach — faint nebulae, galaxies and wide extended targets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt has no real application in a visual eyepiece train; the flattener and back focus are set for a camera sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat cameras does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAny cooled CMOS or CCD astronomy camera reaching the 56.2 mm back focus with its own nosepiece, filter wheel or off-axis guider included in that figure — 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 Epsilon-160ED?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe 180ED is larger and faster — 180 mm aperture at f\/2.8 against 160 mm at f\/3.3 — and correspondingly heavier at 10.7 kg against 6.9 kg.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 180 mm f\/2.8 hyperbolic astrograph with the flattener built in, delivering a flat 44 mm image circle at a fixed 56.2 mm back focus for imagers who want the fastest deep-sky speed Takahashi's Epsilon line offers.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047050498159,"sku":"TAK-TEK18010","price":6585.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TEK18010_Epsilon-180ED_OTA_1.jpg?v=1786911699"},{"product_id":"takahashi-epsilon-130d-f-3-3-hyperbolic-astrograph-ota","title":"Takahashi Epsilon-130D f\/3.3 Hyperbolic Astrograph OTA","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Epsilon-130D is Takahashi's 130 mm hyperbolic astrograph — a fast, wide-field imaging system rather than a visual telescope. At 430 mm focal length and f\/3.3 in a 460 mm tube, it covers a 44 mm image circle at native focus and weighs 4.9 kg. The digital-generation redesign of Takahashi's original 1980s Epsilon series, it uses a hyperbolic primary and a digital corrector built specifically for modern CMOS and CCD 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 want speed and field over reach — f\/3.3 gathers light fast enough to shorten exposure times on faint, extended targets, and the 44 mm corrected circle covers full-frame sensors at native focus, no separate flattener needed. It suits imagers working large emission nebulae, wide star fields and the kind of targets that need field, not focal length, and its 4.9 kg weight and airline-transportable design make it a workable travel astrograph.\u003c\/p\u003e\u003cp\u003eIt is not built for eyepiece observing — there is no meaningful visual use case at f\/3.3 with a Newtonian-style light path. If wide-field imaging is the goal, tell us your camera and mount and we will confirm the fit.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHyperbolic primary with digital corrector:\u003c\/strong\u003e a redesigned optical train delivering sub-10 µm spots across the field, tuned for modern digital sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e430 mm at f\/3.3:\u003c\/strong\u003e fast enough to shorten integration time on faint, extended targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44 mm corrected image circle\u003c\/strong\u003e at native focus — full-frame coverage without a separate flattener.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4.9 kg:\u003c\/strong\u003e light for a fast 130 mm astrograph, and compact enough to check as airline baggage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e23 mm of drawtube extension\u003c\/strong\u003e and a 56.2 mm back focus at prime.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.5x extender compatible:\u003c\/strong\u003e the Ɛ-EX 130D converts the system to 650 mm at f\/5.0, still a 44 mm circle.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Epsilon-130D uses a hyperbolic primary mirror paired with a multi-element digital corrector positioned ahead of the focal plane — the corrector is what flattens the field and controls coma across a fast f\/3.3 system, delivering sub-10 µm spot sizes at the design wavelengths. This is a purpose-built imaging design: there is no accessible focal plane for a diagonal and eyepiece, and the light path exists to put a flat, corrected image on a sensor.\u003c\/p\u003e\u003cp\u003eThe Ɛ-EX 130D 1.5x extender converts the system to 650 mm at f\/5.0, still with a 44 mm corrected circle and 56.2 mm back focus — useful for tighter framing on smaller targets without leaving the Epsilon-130D's optical train.\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 430 mm and f\/3.3, large emission nebulae and star fields across a 44 mm circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast narrowband imaging:\u003c\/strong\u003e the f\/3.3 speed shortens exposure times where signal is otherwise faint.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTighter framing:\u003c\/strong\u003e with the Ɛ-EX 130D 1.5x extender at 650 mm and f\/5.0, for smaller targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel astrophotography:\u003c\/strong\u003e compact and light enough for portable rigs and checked baggage.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus at prime is 56.2 mm, unchanged with the Ɛ-EX 130D extender fitted — a tight figure that camera and filter-wheel stacks need to hit precisely to reach focus and keep the field flat. The Epsilon-130D's own system chart, in the Downloads tab, lists the exact parts and distances for both configurations. Our \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e collects these figures for the whole Takahashi range in one table.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtender:\u003c\/strong\u003e Ɛ-EX 130D 1.5x, 650 mm at f\/5.0, 44 mm circle, sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e sold as an OTA — no mount, rings, dovetail or camera included. At 4.9 kg plus a full imaging train, a mount rated for 8–10 kg of total payload is a reasonable starting point.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollimation:\u003c\/strong\u003e as a fast hyperbolic system, collimation accuracy matters more than on a slower Newtonian — Takahashi's modified collimation system on this model is built to make that adjustment manageable.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are not sure your camera and filter setup will hit 56.2 mm exactly, send us the details and we will work it out with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for eyepiece observing.\u003c\/strong\u003e This is an imaging-only optical train with no accessible visual focal plane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is an optical tube assembly.\u003c\/strong\u003e Mount, rings, dovetail and camera are all sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBack focus is tight and fixed.\u003c\/strong\u003e 56.2 mm at both native focus and with the 1.5x extender — the system chart in the Downloads tab lists the parts that hit it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollimation matters more at f\/3.3.\u003c\/strong\u003e A fast hyperbolic system shows collimation error more readily than a slower one; the modified collimation system on this model is built for that adjustment.\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\u003eCollimation needs more attention than on a slower telescope because f\/3.3 shows error more readily, but the modified collimation system is built for that adjustment, and the published system chart names the exact spacing your imaging train needs. Send us your camera and filter setup and we will confirm the train with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWide-field deep-sky imaging — large emission nebulae, star fields, and fast narrowband work where the f\/3.3 speed shortens exposure time.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It has no accessible visual focal plane — this is a dedicated imaging astrograph.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a flattener?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — the 44 mm image circle is corrected at native focus, covering full-frame sensors without a separate flattener.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat mount does it need?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAt 4.9 kg before accessories, most imaging mounts in the mid-payload class handle it. Tell us your mount model and full imaging train weight and we will confirm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does the 1.5x extender change things?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt converts the system to 650 mm at f\/5.0, still with a 44 mm circle — useful for tighter framing on smaller targets without changing telescopes.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 130 mm f\/3.3 hyperbolic astrograph at 430 mm focal length with a 44 mm corrected image circle at native focus, weighing 4.9 kg. It is a dedicated imaging telescope built for wide, fast deep-sky work, with a 1.5x extender available for tighter framing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Diagram Reports\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes a spot diagram for the Epsilon-130D at native focus, showing star images across the field at the design wavelengths.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/Epsilon-130D_spots.png?v=1786911643\" alt=\"Takahashi Epsilon-130D 130mm hyperbolic astrograph spot diagram\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047056887919,"sku":"TAK-TEK13010","price":3624.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/TEK13010_Epsilon-130D_OTA_1.jpg?v=1786911987"},{"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":1269.0,"currency_code":"CAD","in_stock":true}],"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":1382.0,"currency_code":"CAD","in_stock":true}],"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-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":1425.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka68595_3.jpg?v=1786914054"}],"url":"https:\/\/ontariotelescope.com\/collections\/takahashi-epsilon.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}