Nikon EDG2 10x42 ED Roof Prism Binoculars 7567, class-leading roof prism binoculars with superior ergonomics, 42 mm objective lens and 10x magnification. Nikon 's ED (Extra-Low Dispersion) glass lenses, dielectric high-reflective multilayer prism coating and advanced multilayer binocular lens coating combine to deliver superior light transmission and clear, high-resolution images with superb contrast, even in low-light. These Nikon Binoculars feature large focus knob that prevents unintentional diopter changes for convenient operation. In additin, the binoculars are constructed from lightweight magnesium alloy body that has a durable design with rubber armoring for shock resistance and a firm, comfortable grip. Turn-and-slide rubber eyecups with multi-click system make it easy to adjust the eyepoint for a full field of view. Field curvature is minimized by the field flattener lens system that ensures a superior image all the way to the lens periphery. The large, easy to use focus knob covers the diopter adjuster, which helps prevent unintentional changes to the diopter setting. Nikon Edge Two 42mm Roof Prism Binoculars are extremely portable and highly durable, these waterproof and fog-free binoculars are ideal for trekking and nature watching.