The Action Series binoculars utilise a multi-coated, high resolution, aspherical lens system engineered to provide an extremely clear, distortion-free image over the entire field of view. The advanced eyepiece design also offers substantial eye relief, which makes the binocular compatible with eyeglasses. The Action Series binoculars are built on an all-metal chassis and lens fittings housed in a tough, lightweight polycarbonate body shell. The binocular bodies are ergonomically shaped, tripod adaptable and are rubber coated for an easy, non-slip grip. Like all Nikon central focus binoculars, the Action Series features a diopter control for total viewing consistency. This control, located on the binocular’s right eyepiece, is essential to compensate for common left eye/right eye vision imbalance. Nikon Action Series binoculars incorporate multi-layered anti-reflective lens coatings formulated to deliver optimum brightness, high contrast, true colour rendition and flare-free viewing. The Action Series also utilizes BaK4 high index prisms for clear, round images free from vignetting.