Waterproof (up to 1m/3.3 ft. for 5 minutes) and fog-free with nitrogen gas High-eyepoint design provides a clear field of view even for eyeglass wearers Turn-and-slide rubber eyecups with multi-click Multilayer-coated lenses and large objective diameter for optimal image clarity Rubber armouring for shock resistance and a firm, comfortable grip Eco-glass optics are free of lead and arsenic (16x50CF includes tripod adaptor)