Vortex Diamondback HD Full-Size Binoculars - 12x50 - 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. Multi-layer prism coatings provide bright, clear, color-accurate images. ArmorTek is an ultra-hard, scratch-resistant coating that protects exterior lenses from scratches, oil and dirt. Rubber Armor provides a secure, non-slip grip, and durable external protection. O-ring seals prevent moisture, dust and debris from penetrating the binocular for reliable performance in all environments. Argon gas purging prevents internal fogging over a wide range of temperatures. Shockproof: Rugged construction withstands recoil and impact 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 Package includes: GlassPak binocular case, GlassPak case harness, Comfort neck strap, Tethered objective lens covers, Rainguard Eyepiece Cover, Lens Cloth