PC3 phase coating Applied to the prisms, to enhance resolution and contrast. Dielectric prism coating Applied to the prisms, it ensures vivid colour reproduction and allows 92% light transmission for bright images. Exclusive exo barrier protection Bushnell's newest and best protective lens coating molecularly bonds to the glass, repelling water, oil, dust, debris and preventing scratches. ED primes glass Bushnell's highest quality glass delivers amazing colour, resolution and contrast, even in lowlight conditions. Maximum brightness Combines 10x magnification with 50mm objective lenses for maximum brightness. The only sure thing about any environment is that it will change temperatures, moisture and lighting conditions can all fluctuate from one minute to the next. Engage binoculars were built from the inside out to deliver worldclass performance every time, in every condition. The glass captures bright, clear Images while preventing glare and actively repelling water, oil, dust and debris. The locking diopter permanently secures the desired focus setting, no matter what. The rugged chassis is built to take a beating, so you can maintain focus and engage on What's out ahead.