Brunton Hunting 8.5 X 43 Full Size Epoch Roof Prism Binocular Eyecups ; our patented eye relief system adjusts in tiers, then locks to hold the position that suits you, with or without eyeglasses. Focus System; is finer and slower from 30 feet in, faster from 30 feet to infinity. Now you can capture distant targets fast, or dial in nearby details. Ocular lens, produces a larger field of view, for a better look at what's out there Prism design with superior SF glass, AL-HR reflective coatings and five rock-solid roof prism set screws optimize light, color and clarity. "Best of the Best" in Field & Stream