The Hawke Endurance 12X50mm Binoculars have Extra-low Dispersion glass for optimum clarity, fully multi-coated optics to produce sharp images, a focus knob with 1.2 turns - close focus from 2.5m, high resolution phase corrected BAK-4 roof prisms, lightweight rubber coated full-size top hinge chassis, stay-on lens covers for maximum lens protection and twist-up eye cups with position stops for eye relief.