The Nikon 16 x 50 Action Extreme Waterproof Binocular is a well constructed optic, that is both reliable and adaptable under extreme conditions. It features an all-metal chassis with the lens fitting housed in a tough, lightweight polycarbonate case. In addition, it features a nitrogen-filled barrel and O-ring that makes it fog-proof and waterproof, enabling usage in almost any environment and terrain. The binoculars are tripod adaptable and rubber coated for a non-slip grip for wet or dry conditions. The optics also feature a unique, click-stop eyecup design that and a long eye relief that lets you use the binoculars while wearing spectacles or sunglasses. These binoculars provide you with a 52.1 degree apparent angle display.