Refractor telescope aperture 60 mm focal length 700 mm focal ratio 1117 optical systems fraunhofer achromatic refractor suitable for children max useful magnification 120 x tracking altazimuth mount altazimuth az 1 tripod aluminium tripod telescope feature easily transportable lens barrel length 680 mm minimum useful magnification 8 resolution power 22 bogensekunden finderscope 5x24 eye piece 125 eyepiece types huygens super ramsden ey