{"product_id":"skywatcher-tetra-80ed-quadruplet-apo","title":"SkyWatcher Tetra 80ED Quadruplet APO","description":"\u003ch3\u003eSkyWatcher Tetra 80ED Quadruplet APO\u003c\/h3\u003e\n\u003cp\u003eThe Sky-Watcher Tetra 80ED is a four-element apochromatic astrograph built around two elements of HOYA glass - one FCD100, one FCD1 - in a quadruplet design that corrects colour and field curvature in the objective itself. There is no separate flattener to space, tilt or misplace: the telescope focuses a flat, colour-corrected 44mm field straight onto a full-frame sensor.\u003c\/p\u003e\n\u003cp\u003eAt 80mm of aperture and 400mm of focal length it works at f\/5, fast enough for short sub-exposures on wide targets while staying at a focal length that is forgiving to guide. Every air-to-glass surface is fully multi-coated, and the 1:10 rack and pinion focuser gives the fine control needed to hold focus at this focal ratio.\u003c\/p\u003e\n\u003cp\u003eThe optical tube and lens hood are carbon fibre, which keeps the whole assembly at 4.1 kg including the camera adapter and holds focus better through a falling night temperature than an aluminium tube of the same size. A (D-Style) dovetail plate is fitted for mounting.\u003c\/p\u003e\n\u003cp\u003eUnusually for an astrograph, the Tetra 80ED arrives ready to observe as well as image: a 2in dielectric-coated diagonal, a 70 degree ultra wide 20mm eyepiece and an 8x50 finderscope are all in the box.\u003c\/p\u003e\n\u003ch3\u003eKey Features:\u003c\/h3\u003e\n\u003cp\u003eFour-Element Apochromatic Optical System\u003c\/p\u003e\n\u003cp\u003eHOYA FCD100 and FCD1 Glass\u003c\/p\u003e\n\u003cp\u003eFlat 44mm Full-Frame Field\u003c\/p\u003e\n\u003cp\u003e80mm Aperture and 400mm Focal Length\u003c\/p\u003e\n\u003cp\u003e1:10 Rack and Pinion Focuser\u003c\/p\u003e\n\u003cp\u003eCarbon Fibre Optical Tube and Hood\u003c\/p\u003e\n\u003ch3\u003eWhat's in the Box:\u003c\/h3\u003e\n\u003cp\u003eSkyWatcher Tetra 80ED Quadruplet APO\u003c\/p\u003e\n\u003cp\u003eOptical Tube Assembly \u003c\/p\u003e\n\u003cp\u003eDiagonal\u003c\/p\u003e\n\u003cp\u003eEyepiece\u003c\/p\u003e\n\u003cp\u003eFinderscope\u003c\/p\u003e\n\u003cp\u003eMounting\u003c\/p\u003e\n\u003cp\u003eFocuser\u003c\/p\u003e","brand":"SkyWatcher","offers":[{"title":"Default Title","offer_id":51395095625895,"sku":"GC39-SWTETRA80ED","price":2498.99,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/4083\/0375\/files\/GC39-SWTETRA80ED.jpg?v=1790053503","url":"https:\/\/www.georges.com.au\/products\/skywatcher-tetra-80ed-quadruplet-apo","provider":"Georges Cameras","version":"1.0","type":"link"}