With BAK4 roof prism optical systems for more compact, modern, and lightweight optics than the industry norm, the Hawke Sport Optics Endurance 7x42 Marine Monocular helps 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 makes this monocular quick and easy to use. Water and fog proof with a high-grip rubber coated body, Endurance is designed to battle the elements.