Sky-Watcher Evostar-90 (EQ2) 90mm (3.5"") f/900 Achromatic Refractor Telescope. The Sky Watcher Evostar series are two-element air-spaced, multi-coated 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 our solar system, giving crisp images. These telescope packages will stand you in great stead for a lifetime of serious astronomical viewing.