Glassing out west demands an HD optic, but other systems can&';t get you the clarity you need to see a tail twitch in low light, or pick a tine out of dense cover. The redesigned Diamondback HD spotting scopes have all the horsepower the long-distance for your needs, and they excel in lowlight-right when you need it most. We&';ve also streamlined the exterior for a sleeker, snag-free profile, building in a helical focus wheel. 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.ArmorTek A(R) Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt. Waterproof O-ring seals prevent moisture, dust and debris from penetrating for reliable performance in all environments. Shockproof Rugged construction withstands recoil and impact. Fogproof Argon gas purging prevents internal fogging over a wide range of temperatures. Rubber Armor Provides a secure, non-slip grip, and durable external protection. Adjustable Eyecups Twist up and down for comfortable viewing with or without eyeglasses. Helical Focus Allows for fast and fine adjustments. Arca-Swiss Compatible Directly mounts to Arca-Swiss tripod heads without the use of additional plates. Also accepts 1/4-20 threads for use on alternate style tripod heads. Tripod Adaptable Allowing use on a tripod or car window mount. Tripod adapter required. Rotating Tripod Ring Allows rotation of the eyepiece to a sideways position, providing adjustable viewing angles. Built-in Sunshade Reduces glare and shields the objective lens from raindrops and snow.