Sky-Watcher Mercury-707 (AZ) 70mm (2.75") f/700 Achromatic Refractor Telescope. The highly affordable Sky-Watcher Mercury series of refractor telescopes allow you to take your first steps into the fascinating world of astronomy. They are supplied with good levels of equipment for astronomical observations. Although similar externally to many other telescopes on the market, these telescopes are supplied with superior 1.25" eyepieces and accessories (not 0.96" or hybrid 1.25") and moreover, the eyepieces have been specially selected to give a much more useful and practical range of magnifications, to increase your viewing experience.