{"product_id":"takahashi-epsilon-180ed-1-5x-extender","title":"Takahashi Epsilon-180ED 1.5x Extender","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe Epsilon Extender 1.5x E-180ED extends the Epsilon-180ED astrograph's native 500mm f\/2.8 to 780mm f\/4.3, carrying the Epsilon series' coma correction through to the longer focal length. Seven elements in five groups magnify and re-correct the image together, holding the same fully-corrected Φ44mm circle the telescope delivers at prime focus.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis extender suits Epsilon-180ED owners who want more reach for tighter deep-sky targets — galaxies, planetary nebulae, compact clusters — while keeping the fast, coma-corrected imaging the Epsilon-180ED is built for.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7 elements in 5 groups:\u003c\/strong\u003e a complete optical assembly that maintains coma correction at the extended focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.5x extension:\u003c\/strong\u003e takes the Epsilon-180ED from 500mm f\/2.8 to 780mm f\/4.3.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eΦ44mm corrected image circle:\u003c\/strong\u003e fully corrected for coma, suited to full-frame sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM68 input \/ M54 output threads:\u003c\/strong\u003e installs between the Epsilon-180ED's camera angle adjuster and a standard camera adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBack focus with the extender in place is 56.2mm, the same figure the Epsilon-180ED uses at prime focus, so an existing spacing setup carries over directly. See the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e for the full spacing chain.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eImaging smaller deep-sky targets that are undersized in the Epsilon-180ED's native 500mm field; narrowband and high-resolution imaging where the extra reach helps frame a target tightly; general astrophotography where 780mm f\/4.3 suits the target better than 500mm f\/2.8.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eTelescope\u003c\/th\u003e\n\u003cth\u003eResulting focal length\u003c\/th\u003e\n\u003cth\u003eResulting focal ratio\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEpsilon-180ED\u003c\/td\u003e\n\u003ctd\u003e780mm\u003c\/td\u003e\n\u003ctd\u003ef\/4.3\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e56.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eThe extender is specific to the Epsilon-180ED — the Epsilon-130D and Epsilon-160ED each use their own dedicated 1.5x extender, sized for their own thread interfaces.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eFilters mount at the camera, not on the extender:\u003c\/strong\u003e Takahashi recommends against screw-in 2\" filters here, so a filter wheel or camera-side filter mount is the way to add narrowband or broadband filtration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAt 550g,\u003c\/strong\u003e it's a modest addition to the imaging train — worth noting once your camera and filter wheel are attached, but not a figure that will drive your balance point on its own.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it installs between the Epsilon-180ED's camera angle adjuster and your camera on M68 and M54 threads, and the 56.2mm back focus matches the telescope's native prime-focus figure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eImaging deep-sky targets that need more reach than the Epsilon-180ED's native 500mm provides, while keeping the coma correction the Epsilon series is known for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt's built as an imaging accessory — the corrected image circle and mechanical interfaces are designed around camera sensors rather than eyepieces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat else do I need with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour camera's own T-ring or M54 adapter to complete the connection at the 56.2mm back focus figure.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA coma-corrected 1.5x extender that takes the Epsilon-180ED to 780mm at f\/4.3 across a Φ44mm image circle, at the same 56.2mm back focus the telescope already uses at prime focus.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047112593519,"sku":"TAK-TKA68595","price":1444.3,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka68595_3.jpg?v=1786914054","url":"https:\/\/ontariotelescope.com\/products\/takahashi-epsilon-180ed-1-5x-extender","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}