Nikon 7245 Action 10x50 EX Extreme All-Terrain Binocular Rugged waterproof, fog proof construction Bright, multicoated optics Long eye relief for eyeglass wearers Objective diameter: 50 mm. Fov at 1000 yds: 341 ft. Close focus Distance: 23 ft. Exit Pupil: 5 mm. Interpupilary distance: 56-72 mm.