The Luna 90 or 90/900 Sky-Watcher refracting telescope is recommended for anyone looking for a good quality telescope for lunar and planetary observations. Practically this is the larger version of Luna 80 model which provides 26% more light than Luna 80 (65% more light than Luna 70) and better optical resolution.

The objective lens is a 90mm Fraunhofer air spaced achromatic lens with 900mm focal length with a theoretical resolution of 1.3". The Cassini-division in Saturns ring system or the Great Red Spot on Jupiter can be seen, including martian polar caps and continents. All of the Messier object are reachable (dark skies required) and many globular clusters and galaxies can also be observed. The telescope comes with 2 Barium eyepieces (10 and 25mm) providing 36x and 90x magnification, an achromatic Barlow lens. The Barlow lens feature a T2 thread and thus can be used for photography. The focuser also has a T2 mount. A 6x30 spring load achromatic finderscope is included which can be removed in a second for transportation. The mount is an EQ-2 model which is more robust than the EQ-1 and can be equipped with a clock drive. A star diagonal (adjustable to 45 or 90 degrees) is also included. An Amici prism can be used for daytime observations to produce erect images. For solar observations Baaders solar filter is available.