By way of its high-index BaK-4 prisms and fully multi-coated lenses the binoculars deliver crisp, clear images while its waterproof, fogproof and dirtproof features help to ensure a great viewing experience under a variety of weather-related conditions. Additionally, long-eye relief capability and the binocular's twist up/down eyecups make them more comfortable to use over extended periods of time.Hermetically Sealed And Nitrogen Purged. For waterproof and fogproof performance.Phase Coated Prisms with UV ProtectionProduce sharp, high-contrast images with higher resolution.High-index BaK-4 Prisms.World-class Olympus optics are designed to produce razor sharp images.Long Eye-Relief and Twist Up/Down Eye Cup. Be comfortable looking through these binoculars and stay that way for as long as you do. High-index BaK-4 prisms for bright, crisp images Fully multi-coated lenses Hermetically sealed and Nitrogen-filled for waterproof, fogproof and dirtproof performance Phase and UV coating Long Eye-Relief with Twist Up/Down Eyecups Large center-focus knob for fast, easy focusing Built-in dioptic correction adjusts to individual eyesight Internal focusing system Specifications Binocular TypeRoof Prism Magnification10x Objective Lens Diameter42 mm Exit Pupil Diameter4.2 mm Real Angle of View6.0° Apparent Angle of View60º Field of View at 1000 Yards314 ft. Relative Brightness17.6 Eye Relief15 mm Diopter Adjustment RangeOver ± 2m -1 Eye Interval Adjustment Range60 ~ 70 mm Near Focus Distance9.8 ft./3.0m Weight23.3 oz./660 g Dimensions5.1 in. (W) x 5.7 in. (H) x 2.1 in. (D) or | 130mm (W) x 145mm (H) x 53mm (D) Lens Composition9 elements in 6 groups CoatingFull Multi-coating; Phase-coating; UV-coating FeaturesNitrogen-filled waterproof binoculars | Long eye-relief and adjustable eyepieces (twist up/down) | High-index BaK4 prisms | Environmentally-friendly lead-free glasses
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