Nikon 7583 MONARCH 5 20x56 Binocular (Black) All MONARCH 5 binoculars are now built with Nikon's legendary ED (Extra-low Dispersion) glass lenses, which correct chromatic aberrations across the furthest limits of the visible light range and effectively compensate for color fringing. Dielectric High-Reflective Multilayer Prism Coatings are applied to all lenses and prism coatings to provide high-contrast images and accurate color reproduction. Massive 56mm objective lenses provide superior light gathering ability for overcoming less than ideal lighting conditions.