Alpen Wings 8x42 Binocular BAK4 Multicoated Dark Green Medium Roof. This versatile Binocular from the binocular experts at Alpen is completely waterproof and is designed with an open bridge for steady gripping. The Alpen Wings 8x42mm Binocular features BaK4 prisms and fully multi-coated optics that promise to deliver bright high-contrast images even in twilight conditions. This Alpen Binocular is made with an open bridge for steadfast gripping and has twist-up eyecups that have ample eye relief to accommodate users with or without eyeglasses. The Alpen Wings Waterproof Binocular features an open bridge for a versatile grip. Specifications for Alpen Wings 8x42mm Roof Prism Binocular: Manufacturer: Alpen Color: Dark Green Magnification: 8 x Objective Lens Diameter: 42 mm Prism System: Roof Prism Material: BAK4 Eye Relief: 17.3 mm Field of View Linear: 406 ft at 1000 yds Optical Coating: Multicoated Binoculars Focus System: Center Focus Close Focus: 8 ft Water Resistant Mark: 1 m Water Resistance Level: Waterproof Weight: 35.2 oz Magnification Type: Fixed Package Contents: Alpen Wings 8x42 Binocular Bag Lens cleaning tool Alpen 542: Wings 8x42 Binocular BAK4 Multicoated Dark Green Medium Roof