Waterproof Binoculars Don?t Have to be Expensive! Bresser?s waterproof C-Series binoculars come in a versatile selection of sizes from compact 25mm models perfectly sized to slide into a backpack or pocket to the larger 50mm models that drink in light and are great for astronomy. In addition to a sleek roof prism design that is unobtrusive and easy to grip, all models are made with premium BaK-4 prisms that are fully multi-coated for brilliant images rich in contrast. The binoculars have a waterproof casing and the optical barrels are purged with an inert gas to prevent internal fogging. Additional features include twist-up eyecups for comfortable viewing, diopter adjustment that guarantees each eye is properly focused and a tripod thread for situations when extra stability is needed. end tab Specs Item Number 90-00842 Magnification 8x Field of View 132m/1000m Lens Coatings Fully Multi-Coated Waterproof Yes Focuser Type Center Dimensions 6.4 x 5.4 x 2.7 in Brightness 28 Objective Lens Diameter 42mm Close Focus 3m/10ft Prism BaK-4; Eyecup Type Twist up Housing Hard Rubber (Aluminum Body) Weight 1.8 lbs end tabWarranty USA Limited Lifetime Warranty when product is registered within 60 days of purchase. Click Here to register. CA Residents: Prop 65 WARNING(S)