Skywatcher 150 Black Diamond Reflector OTAThe Sky Watcher Black Diamond 150 750 Photo Reflector OTA is a 150mm aperture Newtonian reflector with diffraction limited optics, all the light gathering power you need for visual use or astrophotography! Newtonian reflector telescopes are among the most cost effective design on the market, reaching much larger apertures than an equivalently priced refractor. The large aperture will help resolve faint, extended objects like nebulae and galaxies,