Refractor telescope aperture 90 mm focal length 900 mm focal ratio 110 optical systems fraunhofer achromatic refractor suitable for beginners max useful magnification 180 x tracking altazimuth mount altazimuth az 3 tripod aluminium tripod telescope features barlow lens compatible easily transportable astrophotography function none minimum useful magnification 12 coating fully coated series skywatcher evostar finderscope 6x30 eye piece 125