Designed for optimum comfort when viewing terrestrial subjects or bird-watching, the Tele Vue 1.25" 60° Everbrite Star Diagonal eschews the conventional 90° viewing angle, for a more ergonomic 60° angle. A mirror corrects images vertically but not horizontally, so subjects will appear right-side-up but directions will be reversed. Made of a single piece of aluminum with an anodized finish, the barrel fits 1.25" drawtubes and accepts 1.25" eyepieces. To prevent marring or scratches, there is a brass retaining ring in the eyepiece holder with a thumbscrew to secure it in place.