Refractor telescope aperture 80 mm focal length 400 mm focal ratio 15 optical systems fraunhofer achromatic refractor suitable for beginners max useful magnification 160 x tracking altazimuth mount azimutal goto etx dual fork tripod aluminium tripod features goto red dot viewfinder minimum useful magnification 11 coating multi coated resolution power 144 bogensekunden light collecting power 7mm pupil 130 border size 113 mag eye piece 125