Vortex Kaibab HD Full-Size Binoculars - 18x56 - It takes serious patience and superior optics to locate trophy animals at extreme distances. The Kaibab HD delivers the premium-quality, high-magnification optical performance you need to get the job done. Intended to be used with a tripod for extended, comfortable, rock-steady viewing. APO System Index-matched lenses correct color across the entire visual spectrum. HD Lens Elements Premium extra-low dispersion glass delivers the ultimate in resolution and color fidelity, resulting in high-definition images. XR Plus Fully Multi-Coated Ultimate anti-reflective coatings on all air-to-glass surfaces provide maximum light transmission for peak clarity and the pinnacle of low-light performance. Dielectric Coating Multi-layer prism coatings provide bright, clear, color-accurate images. Plasma Tech Cutting edge coating application process provides unparalleled coating durability and performance Phase Correction Coating on roof prism models enhances resolution and contrast. Roof Prism Valued for greater durability and a more compact size. Waterproof O-ring seals prevent moisture, dust and debris from penetrating the binocular for reliable performance in all environments. Fogproof Argon gas purging prevents internal fogging over a wide range of temperatures. ArmorTek Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt. Rubber Armor Provides a secure, non-slip grip, and durable external protection. 56 mm Lenses Maximize low light performance. 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.