Description Its mounting system features a standard 1/4"-20" socket and its shoe is ARCA-style compatible, which means you can directly mount it on an ARCA head without the need for additional plates. Its mounting collar can also be rotated at 45Â increments for precise eyepiece placement and optimized viewing comfort. The Diamondback's chassis is argon filled and O-ring sealed to be waterproof and resistant to internal fogging when moving through extreme changes in temperature and environmental conditions. A retractable sunshade prevents lens flare that can spook game and keeps rain and snow off the objective to ensure clear views in less-than-ideal weather. Vortex includes a simple neoprene case that offers further protection against knocks and moisture. Tethered eyepiece and objective caps offer protection while preventing their loss when you're using the spotter.PRODUCT DETAILPowerful 20-60x zoom eyepiece is optimized for long-range applications and basic astronomy Large, oversized 85mm objective lens gathers the light required to ensure views remain bright and sharp when observing subjects on maximum magnification at extreme long range Traditional Porro prism light path produces clear and bright views without internal light interference High-density (HD), extra-low dispersion (ED) glass lens elements reduce chromatic and spherical aberrations for increased contrast and improved color rendition and sharpness without distortion across the entire field of view Anti-reflection fully multicoated optics increase light transmission for accurate color fidelity and improved contrast and clarity ArmorTek exterior lens coatings resist scratches and abrasions while allowing oil, dirt, and sap to be cleaned off without leaving smudges or residue 108-foot field of view at 1000 yards at 20x; 60-foot field of view at 60x