Sky-Watcher Skymax-127 (EQ3 PRO) 127mm (5"") f/1500 Syn Scan GO-TO Maksutov-Cassegrain Telescope. Skymax Black Diamond Series Maksutov-Cassegrains. Available in apertures of 127mm, 150mm & 180mm. Excellent for high-power, high-resolution & Planetary applications. They employ super-high contrast optical systems, utilising high-transmission multi-coatings on all optical services, for optimum optical performance. The quality of each telescope is monitored by means of a Ronchi test & an artificial star test. No effort is spared to reach optimal optical quality.