Nikon ProStaff 5 12x50 BinocularsNikon ProStaff 5 12x50 binoculars are a lightweight roof prism design made with polycarbonate frames. At just 27. 9 ounces, the Nikon 12x50 ProStaff binoculars are very light for a 50 mm binocular. The 12x50 ProStaff 5 binoculars are made with multi coated Eco glass lenses for brighter images and have BaK 4 glass prisms. Nikon 12x50 ProStaff 5 binoculars have full armoring for durability and are completely waterproof and fog proof. All Nikon ProStaff