Steiner Binoculars allow more light through the lenses, which makes for a sharper image and is critically important in low-light military situations. The combination of premium Steiner glass and proprietary lens coatings results in a viewing experience that is second-to-none. All lenses are multicoated, with a variety of specific coatings which enhance light transmission and provide ultimate protection against dirt, dust and all of Mother Nature's element. For absolute fogproof and waterproof protection, Steiner seals 14-psi pressurized dry nitrogen into its optics, for premium clarity in any condition.