First-class image quality with excellent edge sharpness. Multi-layer coating and anti-reflective coating of the optical components. Adjustable eyepiece +/- 2 diopters. Nitrogen filled, climate resistant, weatherproof and dustproof. One-piece light metal tube with a scratch-resistant, matt surface. Precise click adjustment. Including hinged protective cover or sun visor and mounting rings for Picatinny/Weaver profile.