SHENFAN U.S. Army Wide-angel Zoom Binoculars (Black) Super clear vision, ultra wide view angle all-optical eyepiece lens with multi-coated Porro prism and a quick central focus knob system giving sharp and clear viewing.High-quality multi-coated glass and Porro prism system with fully multi-coated optics and BaK-4 prisms Wide-angle 10x magnification,25-millimeters Large Diameter Eyepiece,50-millimeters Big Objective binoculars,10000M distance.Versatile, and ideal for stadium sports, bird-watching, hunting, and many other outdoor applications. The heavyduty binoculars makes it durable and give you optimal clarity, detail, and brightness with 20x magnification power and a 50mm objective lens diameter.Rugged rubber armoring absorbs shock and offers a secure grip,Cool Russia style, quality touch feeling Design with female screw tread convenient for fixing it onto the tripod,Large center-focus knob for easy adjustments Limited lifetime warranty