Catadioptric telescope aperture 90 mm focal length 1 250 mm focal ratio 1139 optical system maksutov cassegrain suitable for beginners max useful magnification 180 x tracking equatorial mount equatorial mount 1 eq1 tripod aluminium tripod features red dot viewfinder telescope feature astrophotography suitable astrophotography function digiscoping minimum useful magnification 12 eye piece 125 eyepiece type super plssl eyepiece focal length