SkyWatcher 10 Traditional Brand NewIncludes Limited Two Year Warranty The SkyWatcher 10-Inch Traditional Dobsonian Telescope features rock-steadyplatform with very low vibrations. Its large parabolic primary mirror is highly reflective andcorrects spherical aberration to eliminate distortion across the entire field of view especially at the edges. The four-arm secondary mirror bracket is made with 0.5mm thick finesupports to reduce light loss and diffraction spikes. Its f/4.7 focal ratio and Crayford focuser makes this an ideal choice for observation andimaging - especially with larger or heavier rigs.The alt-az rocker mount features Teflon azimuth bearings and a tension clutch on altitude axis.The tension control handle allows users to adjust the settings allowing them to move the mounteasily and smoothly by hand with minimal vibration and maintain its position when released. 10-Inch Traditional Features: 10 Inch Aperture (254mm) Focal Length: 1200mm f/4.7 Focal Ratio 9?50 Finderscope Highly Reflective Mirrors Alt-az Rocker Design Mount 2 Single-Speed Crayford Focuser Dual Axis Teflon Bearings Altitude Tension Clutch Tension Control Handle Specifications: .boldTbl{ font-weight: bold;}.specs td table.specs th {padding: 4px 10px;}Optical Design :ReflectorAperture (mm) :254mm (10 in)Focal Length (mm) :1200 mm (47 in)Focal Ratio :f/4.7Eyepiece Barrel Diameter :2 Directly to FocuserEyepiece Barrel Diameter :1.25 with Included AdapterHighest Useful Magnification :508Limiting Stellar Magnitude :14.7Finderscope :9x50Finderscope :Straight-through ViewingMount Type :DobsonianFocuser Size :2 Focuser Speed :Single SpeedEyepieces :4-element PlosslEyepieces Diameter Barrel :1.25 Eyepieces 25mm Power :48xEyepieces 10mm Power :120xTube Weight :28 lbs (12.7 kg)Base Weight :25 lbs (11.3 kg)Assembled Weight :53 lbs (24.0 kg)