Bushnell NatureView 8x42 Roof Prism Binocular High-quality, roof-prism binoculars with 8x magnification and 42-millimeter objective lenses Premium BaK-4 prism glass with fully multi-coated optics for outstanding image quality Ultra close-focus capabilities with a textured center-focus wheel for easy adjustments Rugged, non-slip rubber armor; extended eye relief for eyeglass wearers Sturdy waterproof/fogproof construction; limited lifetime warranty