HD Optical System: Optimized with select glass elements to deliver exceptional resolution, cut chromatic aberration and provide outstanding color fidelity, edge-to-edge sharpness and light transmission; Fully Multi-Coated: Increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces; Dielectric Coating: Multi-layer prism coatings provide bright, clear, color-accurate images; ArmorTek: Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt; Phase Correction: Coating on roof prism models enhances resolution and contrast; Adjustable Eyecups: Twist up and down for comfortable viewing with or without eyeglasses; Center Focus Wheel: Adjusts the focus of both binocular barrels at the same time; Diopter: Adjusts for differences in a user's eyes. Located on right eyepiece; Tripod Adaptable: Compatible with a tripod adapter, allowing use on a tripod or car window mount