![]() ED doublet refractor optics: 80mm (3.1") aperture, 560mm focal length, f/7 focal ratio doublet optical system using an FK-61 ED (Extra-low Dispersion glass) element to reduce spurious color halos and fringing to vanishingly low levels.The AT80ED also comes with a retractable dew shield to make it as compact as possible.Īs with all Astro-Tech scopes, the AT80ED gives you fully-multicoated ED optics that are essentially free of the annoying halo of unfocused violet light (chromatic aberration) that mars the bright-object images of lesser scopes, despite the fast focal ratio, and even at very high magnifications. The finely-machined Astro-Tech AT80ED comes with both 2" and 1.25" eyepiece holders using non-marring brass compression rings that won’t scratch your star diagonal or eyepiece barrels. ![]() You get dual split mounting rings with a detachable Vixen-style dovetail plate that lets you mount your AT80ED on virtually any altazimuth or German equatorial mount. You get a 2" Rack and Pinion focuser with a microfine 11:1 fine-focusing ratio finished in our Aston Martin Grey body. The reintroduction not only has a much lower price, but it has better mechanics as well as advancements in the optical assembly and polish. When this scope was available in 2008 the retail price was $549. The AT80ED is bringing ED optics to you at a fantastic price. Weight: 6 lbs 3.2 oz with the rings and dovetail, 5 lbs 4 oz without rings and dovetail ![]() Length: 18" dewshield retracted, 21.25" dewshield extended
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