Sky-Watcher Evo Star-150, 150mm (6"") f/1200 Achromatic Refractor Optical Tube Assembly. The Sky Watcher Evostar series are two-element air-spaced, multi-coated object achromatic refractors. They are truly outstanding, high-performance; high-resolution instruments manufactured to extremely high standards & mechanical precision. With their long focal lengths & breathtaking optical performance, they are ideal for the detailed high-power study of the moon, Planetary Surfaces & other objects in out solar system, giving crisp contrasty images. These telescope packages will stand you in great stead for a lifetime of serious astronomical viewing. Please note, this is an Optical Tube Assembly only, mount & tripod are available separately.