The Athlon Optics Argos G2 12x50 HD Binoculars utilize a light weight magnesium alloy chassis and an ergonomic grips, allowing for comfortable, one handed operation. They come equipped BaK-4 prisms that been given Athlons own Enhanced Spectral Prism (ESP) Dielectric coatings. This prism system reflects over 99% of the light into the users eyes for a bright picture with accurate color reproduction.