Nikon Action Extreme All Terrain Binocular, 16x50, Black - 7247 Lens lens diameter: 50 mm, Relative brightness: 9.6, Output pupil: 3.1 mm, Prism system: Porro prism, Magnification: 16 x, Visual rest: 17.8 cm, Focus system: Focus in the center, Min focus distance. :7 m, Focus adjustment: Manual, Field of view: 61 m / 1000 m, Special features: Fogproof, waterproof, Features:Rubber coating, Anti-reflective lens coating:With multiple anti-reflective coating.