Refractor telescope aperture 80 mm focal length 600 mm focal ratio 175 optical systems ed apochromatic refractor suitable for beginners enthusiasts max useful magnification 160 x tracking without ota mount without ota tripod not included features dew shield telescope feature astrophotography suitable astrophotography function digiscoping minimum useful magnification 11 resolution power 144 bogensekunden light collecting power 7mm pupil 131