This Sky-Watcher 120mm. 600mm focal length. f/5 telescope is a two-element. air-spaced. fully multi-coated objective. achromatic refractor. that can give exciting rich field astronomical views. It can provide excellent vistas of star fields. clusters. nebulae. galaxies. planets. the Moon and (with correct filtering or by projection) the Sun. It is also a fine terrestrial telescope when mounted on an alt-azimuth mount or a photographic tripod. Crisp images at a reasonable price make it an excellent beginners first telescope. or a great travelling telescope for a more advanced observer.