Meade LXD75 AR5-AT (f/9) Achromatic Refractor Standard Features Telescope Mounting: LXD75, German-type Setting Circle Diameters, RA and Dec.: 2.25" Polar Illuminated Viewfinder: included RA Control System: 9-speed, microprocessor-controlled, 12v DC, 72mm (2.83") wormgear