Ultra-modern top hinge design; Fully multi-coated optics to produce sharp images; Focus knob with 2 turns - close focus from 6.6ft/2m; High Resolution Phase Corrected BAK-4 Roof Prisms; Lightweight and durable rubber coated full-size chassis; Stay-on lens covers for maximum lens protection; Twist-up eye cups with position stops for eye relief; Nitrogen purged, Waterproof, Fog proof