Diameter=150mm; focal length=750mm. Newtonian reflector instrument. Made in Japan. Collector's item. Beautiful to look at, in excellent condition, with wooden tripod. Includes two eyepieces; 25mm Plossl and 9mm Ultra-wide. German equatorial mount with flanges for adding computer automation. Will throw in the book Backyard Astronomer's Guide by Dickinson and Dyer and a copy of Sky and Telescope's Pocket Sky Atlas.