Nikon ProStaff 5 10x50 BinocularNikon ProStaff 5 10x50 binoculars are a lightweight roof prism design made with polycarbonate frames. At just 28. 7 ounces, the Nikon 10x50 ProStaff binoculars are quite light for a 50 mm binocular. The 10x50 ProStaff 5 binoculars are made with multi coated Eco glass lenses for brighter images and have BaK 4 glass prisms. Nikon 10x50 ProStaff 5 binoculars have full armoring for durability and are completely waterproof and fog proof. All Nikon ProStaff