BRUNTON ETERNA SPOTTING SCOPE w/ LOCKING CENTER RING FOR MULTIPLE VIEWING ANGLES 20-60×80 STRAIGHTED glass (extra-low dispersion fluorite) is ideal for anything from fast-moving varmits to distant big game BaK-4 prism glass Emerald Fire full multi-coating Multi-step eye relief system (eyeglass compatible) Twist-up eyecup Waterproof Nitrogen filled/fogproof Alloy frame w/ergonomic body armor Sight alignment tube Tripod/monopod adaptable Extendable sunshade Limited Lifetime Warranty Eye Relief: 17mm Exit Pupil: 4mm Field of View @ 1000 yds.: 98 – 141 ft. Prism Coating: AL Wt.: 67.2 oz. Close Focus: 20 ft. Includes Interactive neoprene case