This is the heavy-duty binocular for the adventurous mariner who expects equipment to be as tough as he or she is. This heavily-armored set features an all-metal chassis, rubber and polycarbonate shell, a wide field of view, slide cups with click stops, waterproofing and fogproofing and tripod adaptability. For the eco-conscious navigator, all components (including the multi-coated lenses) are fully lead- and arsenic-free. Magn. x Objective Lens Dia.: 7 x 50 Focus: Center Waterproof: Yes Prism Type: BAK-4 Eco-Glass Light Transmission Efficiency: 85% Field of View @1000yds: 420' Eye Relief: 17.1mm Compass: No Rangefinder Reticle: No Weight: 46.7oz. Warranty: 25 years limited