Photron 10" Truss Tube Ritchey-Cretien Telescope with 3" Dual Speed Crayford Focuser, f/8 Focal Ratio, OTA Only

Optical Design Ritchey-Chretien Clear Aperture 10" (254mm) Focal Length 2032 mm Focal Ratio f/8 Focuser 10:1 Crayford dual-speed Focuser size 3" Dovetail Bar Losmandy-style Mounting Bar (Top) Losmandy-style Tube material Carbon truss tube OTA Primary Mirror Cooling Fan Yes (three built-in fan, with battery holder) Dimensions Tube Length: 25.59" (650mm) Weight Tube: 34 lbs (15.4kg)