Celestron C8 S-GT Advanced Computerized Telescope - 11026-XLT OPTICAL FEATURES: Aperture of 8" / Focal length of 2032mm / Focal ratio of f/10 OPTICAL SYSTEM: Schmidt-Cassegrain optics / StarBright XLT high-performance optical coatings MOUNT: Computerized CG-5 equatorial mount TECHNOLOGY: NexStar hand controller with 40,000-object database Authorized Celestron Dealer