BaK-4 prisms and fully multi-coated lenses.Easy to handle and lightweight: O wing to their compactness and light weight, they will fit in any shirt or jacket pocket.Watertight and nitrogen filled.Spectacle [...] multi-coating Optical properties Magnification8 xLens diameter20 mmExit pupill2.5 mmGeometric luminosity6.3Twilight number12.6Near point1.6 mField of view/Visual field/Field of vision119 m/1.000 m Warranty Warranty5