Catadioptric telescope aperture 125 mm focal length 1 250 mm focal ratio 110 optical system schmidt cassegrain suitable for beginners enthusiasts max useful magnification 250 x tracking altazimuth mount azimutal goto nexstar 45 se tripod steel tripod features starpointer goto telescope features astrophotography suitable easily transportable astrophotography function digiscoping lens barrel length 330 mm minimum useful magnification 17 coating