Built for extreme weather and challenging conditions, the Leupold SX-4 Pro Guide HD Gen 2 Spotting Scope delivers picture-perfect image quality. The SX-4 features a rugged-yet-lightweight magnesium body that's 100% waterproof and fogproof along with a full suite of lens coatings designed to shed dirt, water, and smudges. It's built around Leupold's Elite Optical System, which offers excellent dawn-to-dusk light transmission, superior resolution to pick out tines and twigs at extended distances, and industry-leading glare reduction in harsh light. And like all Leupold spotting scopes, the SX-4 Pro Guide HD Gen 2 is guaranteed to perform for life. Mfrs. lifetime warranty. HD Elite Optical System Diamond-Coat scratch-resistant lenses Guard-ion lens coating sheds dirt, water, and smudges Rugged magnesium alloy housing 100% waterproof and fogproof FormFit interchangeable eyecups Arca-Swiss tripod adapter