Nitrogen-filled and O-ring sealed for total water/fogproof and shockproof performance in any environment. Ergonomically shaped, tripod adaptable Rubber coated for a non-slip grip for wet or dry. Offers high-resolution lenses and prism systems crafted from Nikons exclusive Eco Glass", which is made without the use of arsenic or lead. This lens system provides an clear, distortion-free image over the entire field of view. Feature a click-stop eyecup design that not only delivers long eye relief, but also allows for variable eye relief that is customizable to the users. The binoculars are central focus with a diopter control to correct for normal right/left eye vision imbalance.The Extreme ATBs all feature Apparent Angles of view that exceed 65 degrees, making them true Wide Angle binoculars while two of the models, the 7x35 and 8x40, will provide a field of view of over 420 at 1,000 yards, making them true wide field binoculars.