While not an ED refractor, this highly rated telescope uses hand-figured optics and a lower dispersion element providing excellent all-round performance. The Stellarvue 80/9D is an exceptional performer and superb value, making it an excellent choice both for beginners and for imagers in need of a high performance guide scope. A great general-purpose telescope - the Stellarvue 80/9D uses proprietary 80mm F-9.4 hand figured achromatic objective. 2" Rack & pinion focuser, tube rings and dovetail bar supplied as standard.