The Leupold SX-2 Alpine HD is a must have for all serious hunters or shooters. It's waterproof and fog-proof. It features an over-sized eyepiece that allows for comfortable all-day glassing; Leupold's Twilight Max Light Management System, which helps you see more in less light, while reducing glare; built in 1/4-20 rotatable tripod adapter port; twist up eye-cups and scratch resistant lenses.