Eterna full size spotting scope, a premier long distance scope offers the following features; 80mm objective lens w/ED glass, BaK-4 prism glass, multi-step eye relief system (eyeglass compatible), Nitrogen filled with alloy frame and ergonomic body armor. Slight alignment tube and tripod/monopod compatible. Additional spotting assistance offers extended sunshade and locking center ring allows multiple viewing angles. Limited Lifetime Warranty. Contact us for Customer Service, Technical and any other question at 1-800-443-4871 (or) support@brunton.com