The Vortex 8x42 Diamondback HD Roof Prism Binoculars smash the scale of price v/s performance, delivering a rock-solid optic that optically punches high above its class. The included GlassPak binocular harness keeps your glass close at hand, ready to deploy at a moment's notice, all while providing protection and significantly more comfort than traditional neck straps.Optical FeaturesThe HD Optical System is optimized with select glass elements to deliver an exceptional resolution, cut chromatic aberration and provide outstanding color fidelity, edge-to-edge sharpness, and light transmission. It features fully multi-coated elements that increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. The Roof Prisms come with dielectric coating that ensures bright, clear, color-accurate images.ConstructionRubber 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. Vortex 8x42 Crossfire HD also comes with an Argon gas purging that prevents internal fogging over a wide range of temperatures. This shockproof unit comes in a rugged construction that withstands recoil and impact. In addition to this, ArmorTek ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt.ConvenienceAdjustable twist-up eyecups allow for comfortable viewing with or without eyeglasses. You can easily adjust the focus of both the barrels at the same time using the center focus wheel. A diopter located on the right eyepiece adjusts for differences in a user's eyes. Mount these binoculars on a tripod or car window mount using a tripod adapter.GlassPak Binocular HarnessThe included GlassPak Binocular Harness stores and protects your binoculars while keeping them close at hand for quick deployment. Tethers attach to your binoculars for added security against accidental drops while the fully adjustable straps create a comfortable fit.