Vortex Optics Vulture HD Binoculars 15x magnification and 56mm objective lenses, the Vulture HD uses high density extra-low dispersion glass and XR fully multi-coated lenses, you get super bright images that are sharp and clear from edge to edge. Rugged, rubber armor and ultra-hard, scratch resistant armortek coating on all exterior lenses creates a durable binocular able to withstand any conditions. Argon purged and o-ring sealed barrels ensure fogproof and waterproof performance. A center diopter allows you to adjust for focal differences between your eyes. Twist eyecups allow for comfortable viewing with or without glasses. When glassing in the early or late hours of the day when game is most active, you need to have the right tools which is where the Vulture HD binocular comes in. Field of View: 226 feet/1000 yards|4.3 degrees Close Focus: 15 feet Close your right eye or cover the right objective lens with your hand. Look at the object with your left eye and adjust the center focus dial until the image is in focus. Close your left eye or cover the left objective lens with your hand and rotate the ring until the object is in focus. Blow away any dust or grit before wiping the lens. Use a can of pressurized air, soft camel hair brush, or acrylic optical brush. Gently remove smudges, fingerprints, and eyelash oil from the lens. Use a small amount of water or your breath to moisten the lens then wipe away smudges with a clean lens cloth. Isopropyl alcohol can help remove marks like fingerprints.