Catadioptric telescope aperture 102 mm focal length 1 325 mm focal ratio 113 optical system schmidt cassegrain suitable for enthusiasts experts max useful magnification 241 x tracking altazimuth mount azimutal goto nexstar 45 se tripod steel tripod features battery driven wifi starpointer gps goto telescope features astrophotography suitable easily transportable astrophotography function digiscoping lens barrel length 342 mm minimum useful magn