Steiner Binoculars allow more light through the lenses which makes for a sharper image and is critically important in lowlight military situations. The combination of premium Steiner glass and proprietary lens coatings results in a viewing experience that is secondtonone. 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 Natures element. For absolute fogproof and waterproof protection Steiner seals 14psi pressurized dry nitrogen into its optics for premium clarity in any condition. The MilitaryMarine binocular is adapted for rugged allaround use. It is light and easy to handle with bright images and a wide field of view for steady viewing even on the move. The floating prism system uses flexible silicone lens mount to absorb severe shock impact and abuse without damage while the SportsAuto Focus System lets you focus each eyepiece to your vision once then keeps images razor sharp from 20 yards to infinity. The MilitaryMarine features a Markolon housing a durable polycarbonate with NBR Long Life rubber armoring creating a lightweight rugged chassis that withstands 11 Gs of impact.This model has a 10x magnification and a 50mm objective.