The Sky-Watcher Maksutov-Cassegrains are the ultimate take-anywhere telescopes. They are also ideal if working space is limited. Despite their small dimensions they pack a powerful punch. Their High-Resolution, diffraction limited optical systems are multi-coated to maximize contrast and image sharpness. The Sky-Watcher Maksutovs come in apertures of 90mm, 102mm and 127mm, and are available either complete with equatorial mounts and tripods, or as tube assemblies only , which can be mounted onto a standard photographic tripod. Whether your requirement is for terrestrial or astronomical use, these compact scopes are the perfect companion. Tube material: Aluminium.