The Sky-Watcher 80mm (3.1") telescopes has two-element, air-spaced, fully multi- coated objective, refractors. The 80mm f5 is a well- proven performer which gives "rich- field" views of star fields, clusters, nebulae, bright galaxies, planets, the Moon and the Sun with solar filter, as well as excellent terrestrial views. Images which are crisp and with very little chromatic aberration.