{"product_id":"texdx0001-fsq-85-extender-ed","title":"Takahashi EX ED 1.5x Extender for FSQ-85EDX","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe EX ED 1.5x is a 2-inch barrel extender built around extra-low-dispersion glass for the FSQ-85EDX, Takahashi's BabyQ Petzval astrograph. It brings the native 450mm f\/5.3 up to 680mm f\/8.0 while holding a 44mm corrected image circle, functioning as both a magnifying Barlow for visual use and a tele-extender for imaging.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you own the FSQ-85EDX and want tighter framing on smaller deep-sky targets — planetary nebulae, galaxies, globular clusters — than the astrograph's native wide field delivers, without losing the ED-corrected color performance.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eED glass element:\u003c\/strong\u003e extra-low-dispersion glass controls chromatic aberration through the extended path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.5x magnification:\u003c\/strong\u003e 450mm f\/5.3 becomes 680mm f\/8.0 on the FSQ-85EDX.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44mm image circle held constant:\u003c\/strong\u003e the extended focal length stays corrected rather than trading correction for reach.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch barrel interface:\u003c\/strong\u003e mounts directly to the FSQ-85EDX's 2-inch drawtube and doubles as a visual Barlow.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe FSQ-85EDX's four-element Petzval design is corrected natively at 450mm f\/5.3 for wide-field framing. The EX ED 1.5x adds a low-dispersion element ahead of the focuser to extend the focal length to 680mm at f\/8.0 while holding the 44mm image circle and 117.5mm back focus that the astrograph is designed around, rather than simply magnifying and letting the corners degrade.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTighter deep-sky framing on the FSQ-85EDX — small galaxies, planetary nebulae, and globular clusters — and higher-magnification visual or lunar\/planetary use when stacked with the TOA-35FL flattener on a TSA-120, TOA-130NS\/NFB, or TOA-150B.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi publishes this extender on its own for the FSQ-85EDX, and stacked with the TOA-35FL flattener for three additional telescopes.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eConfiguration\u003c\/th\u003e\n\u003cth\u003eNative\u003c\/th\u003e\n\u003cth\u003eResulting\u003c\/th\u003e\n\u003cth\u003eImage circle\u003c\/th\u003e\n\u003cth\u003eBack focus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSQ-85EDX (alone)\u003c\/td\u003e\n\u003ctd\u003e450mm f\/5.3\u003c\/td\u003e\n\u003ctd\u003e680mm f\/8.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTSA-120 + TOA-35FL\u003c\/td\u003e\n\u003ctd\u003e900mm f\/7.5\u003c\/td\u003e\n\u003ctd\u003e1350mm f\/11.3\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-130NS\/NFB + TOA-35FL\u003c\/td\u003e\n\u003ctd\u003e1000mm f\/7.7\u003c\/td\u003e\n\u003ctd\u003e1500mm f\/11.5\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTOA-150B + TOA-35FL\u003c\/td\u003e\n\u003ctd\u003e1100mm f\/7.3\u003c\/td\u003e\n\u003ctd\u003e1650mm f\/11.0\u003c\/td\u003e\n\u003ctd\u003eΦ44mm\u003c\/td\u003e\n\u003ctd\u003e117.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eFor the stacked configurations, the TOA-35FL flattener is a separate part Ontario Telescope also carries. Full spacing detail is in the \u003ca href=\"\/pages\/takahashi-back-focus-guide\"\u003eTakahashi Back Focus Guide\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eStacked use needs the TOA-35FL separately:\u003c\/strong\u003e the TSA-120\/TOA-130\/TOA-150B figures above require both parts together, not this extender alone.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads onto the FSQ-85EDX's 2-inch drawtube directly, with the 117.5mm back focus fixed by the unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTighter deep-sky framing on the FSQ-85EDX, and longer-focal-length imaging on TOA\/TSA triplets when paired with the TOA-35FL.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work as a visual Barlow too?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes — the same 2-inch barrel design functions as a 1.5x magnifier for eyepiece use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it on my TOA-130 without the TOA-35FL?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTakahashi's published figures for the TOA\/TSA telescopes are for the extender stacked with the TOA-35FL flattener; send us your setup and we will confirm what the pairing does for your specific train.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe EX ED 1.5x brings the FSQ-85EDX to 680mm at f\/8.0 with its 44mm image circle intact, and extends further reach to the TSA-120 and TOA-130\/150B line when stacked with the TOA-35FL flattener.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047119310959,"sku":"TAK-TKA37595","price":696.41,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/texdx0001_4_2_6.jpg?v=1786914324","url":"https:\/\/ontariotelescope.com\/products\/texdx0001-fsq-85-extender-ed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}