Reflector telescope aperture 130 mm focal length 650 mm focal ratio 15 optical systems reflector newton suitable for beginners max useful magnification 307 x tracking altazimuth mount altazimuth goto nexstar skyalign tripod steel tripod features battery driven wifi starpointer gps goto telescope feature astrophotography suitable astrophotography function digiscoping minimum useful magnification 19 coating aluminium series celestron nexstar