Hawke Sports Optics' black 10x42 Endurance ED Binoculars feature phase-corrected BAK4 roof prisms, extra low-dispersion (ED) glass, and anti-reflection fully multi-coated optics to produce a versatile and capable optic that produces bright and clear high-contrast images with true color rendition and virtually no color-fringing. Coupled with the optical features are 42mm diameter objectives which give the binocular very competent low-light performance. This combination of optics and objectives make the Endurance binoculars ideally suited for most outdoor activities from hunting, to birding, to sporting events.