Nikon's Aculon Binoculars combine ultraclear multicoated lenses with a full rubber-armor coating for worry-free reliability. Turn-and slide rubber eyecups precisely position your eyes for optimized viewing over long periods of time without eye strain. Aspherical, multicoated eco-glass lenses provide a flat field of view, enhanced brightness and amazing edge-to-edge clarity. Aculon's central focusing dial is easy to reach and quick to adjust. Lightweight construction sports an ergonomic design that's comfortable to hold.