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Type Prism Binoculars Magnification 8x Objective lens effective diameter 25mm Real field of view 6.6° Apparent field of view 52.8° Objective lens construction 4 elements in 3 groups Eyepiece lens construction 4 elements in 3 groups Exit pupil diameter 3.1mm Eye relief 13.5mm Eye width adjustment 56mm ~ 72mm Focusing method Manual focusing by turning the focusing knob Closest focusing distance 3.5 meters/11.5 feet Image Stabilizer Tilt System with Corrective Optics Correction angle ±1.0° Power source 1 x CR123A Dimensions 119.7 x 137.2 x 61.2mm/4.7 x 5.4 x 2.4 in. Weight 490g/17.3 oz. (excluding battery)