Nikon Pro Staff 7 Binoculars 10x42 All lenses and prisms are multilayer-coated to achieve the brightest images, phase correction-coated roof prisms deliver high resolution, high reflection mirror-coating prisms enhance image brightness. High-eyepoint design provides a clear field of view, even for eyeglass wearers. Turn and slide rubber eyecups with multiclick facilitate easy positioning of eyes at the correct eyepoint. Waterproof up to 1m/3ft for 10 mins and fog-free with Nitrogen gas. Rubber armouring for shock resistance and a firm comfortable grip. Eco glass optics that are free of lead and arsenic are employed for all lenses and prisms.