expertbinocular $ com Fieldscope system. Design Viewing Angle Straight Performance Magnification 16 to 48x Objective Lens Diameter 60 mm Angle of View 16x: 2.3�° (Actual) Field of View 16x: 120.0' @ 1000 yd / 36.6 m @ 1000 m Minimum Focus Distance 10.9' / 3.3 m Exit Pupil Diameter 16x: 3.75 mm 48x: 1.25 mm Eye Relief 19.0 mm Features Fogproof Yes Water Resistance Waterproof General Tripod Mounting Thread 1/4"-20 Female Dimensions 2.9 x L: 12.3" / 7.0 x L: 31.0 cm Weight 21.9 oz / 621.0 g Packaging Info Package Weight 3.99 lb Box Dimensions (LxWxH) 17.55 x 7.35 x 4.9"