Catadioptric telescope aperture 203 mm focal length 2 032 mm focal ratio 110 optical system schmidt cassegrain suitable for enthusiasts max useful magnification 406 x tracking altazimuth mount azimutal goto nexstar 68 se tripod steel tripod features starpointer goto telescope feature astrophotography suitable astrophotography function digiscoping lens barrel length 432 mm minimum useful magnification 28 coating starbright xlt resolution power