With BAK4 roof prism optical systems for more compact, modern, and lightweight optics than the industry norm, the Hawke Sport Optics 7x50 Endurance ED Marine Binoculars help you keep your target in view, even in rough waters. ED (extra-low dispersion) glass is utilized to reduce color fringing, also known as chromatic aberration. The fully multicoated lenses provide high resolution images which ensure no details are lost when viewing at distance. Effortless focusing and impressive depth of field make this binocular quick and easy to use. Water and fogproof with a high-grip rubber coated body, Endurance is designed to battle the elements.