The Engage EDX is backed with the all-weather assurance of Bushnell's exclusive EXO Barrier lens coating - it repels water, debris, oil and fog. The fully multi-coated optics offer maximum brightness and clarity and they're housed in a lightweight and rugged magnesium chassis. ED Prime Glass and a locking eyepiece diopter ensure razor sharp images every time. The PC3 phase coating brings to the resolution to the highest level and the dielectric prism coating keeps light transmission high. The result is the best viewing experience perfect for birding, hunting, or general observation. Adapts to Tripod.