Waterproof (up to 1 meter for 5 minutes) and fog-free with nitrogen gas filling. High-eyepoint design provides a clear field of view even for eyeglass wearers. Turn-and-slide rubber eyecups with multi-click facilitate easy positioning of eyes at the correct eyepoint. Wide field of view (except 7x50CF, 16x50CF). 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. Aspherical eyepiece lens eliminates image distortion.