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1)Waterproof Binoculars/waterproof telescope/military binoculars 2)Factory-based export price and best after-sales service,reli Waterproof Binoculars/waterproof telescope/military binoculars * Type: Prism binoculars * Magnification: 10x * Objective lens effective diameter: 42 millimetersmm * Filter size: 52 millimeters * Real field of view: 6.5 degrees * Apparent field of view: 65 degrees * Objective lens construction: 4 elements in 3 groups * Eyepiece lens construction: 7 elements in 5 groups * Exit pupil diameter: 4.2 millimeters * Eye relief: 16 millimeters * Prism type: Porro II * Eye width adjustment: 57 to 75 millimeters * Focusing method: Manual focusing by turning the focusing ring * Dioptric correction: plus or minus 3.0 diopters * Closest focusing distance: 8.2 feet / 2.5 meters * Image stabilizer: Vari-angle prism * Correction angle: plus or minus 0.8 degrees * Tripod socket: Yes * Power source: 2 AA batteries * Dimensions: 5.4 x 6