Sky Watcher 8in. Classic 200P Dobsonian. Classic 200P Dobsonian has a "paraboloidal" primary mirror to eliminate spherical aberration and a four-arm secondary- mirror bracket with fine supports (0.5mm thick) to reduce diffraction spikes and light loss. In addition the Sky-Watcher 8in Dobsonian Telescope includes a 2" focuser with a 1.25" adapter allowing the use of either eyepiece size. This model also includes a tension control handle. For an amazing way to be sure you are using some of the best equipment the telescope industry has to offer choose the Sky Watcher 8in. Classic 200P Dobsonian. Specifications forSky Watcher 8in. Classic 200P Dobsonian: Optical Design: Newtonian Reflector Aperture (mm): 203 mm (8 in) Focal Length: 1200 mm Focal Ratio: f/5.9 Focal Length of Eyepiece 1 (mm): 25 mm Focal Length of Eyepiece 2 (mm): 10 mm Finderscope: 9x50 Highest Useful Magnification: 406x Limiting Stellar Magnitude: 14.2 Features of Sky Watcher 8in. Classic 200P Dobsonian: 8" (203 mm) Dobsonian-style Newtonian 1200 mm focal length (f/5.9) 2" single-speed Crayford-style focuser with 1.25" adaptor 4-element Plossl 25 mm and 10 mm 1.25" eyepieces 9x50 finderscope Solid rocker-mount with Teflon bearings and tension clutch for altitude Teflon bearing for azimuth Package Contents: Sky Watcher 8in. Classic 200P Dobsonian Finder Scope Sky Watcher 8in. Classic 200P Dobsonian S11610