Vortex Optics Vanquish Reverse Porro Prism Binoculars 10x26 10x magnification and 26mm objective lenses, the Vanquish is one of Vortex Optics' smallest, lightest and most compact binoculars. Fully multi-coated lenses allow for increased light transmission and resolution through the binocular, giving you the clear, crisp images you want. Nitrogen purged and o-ring sealed, the Vanquish gives you a lifetime of waterproof and fogproof performance. Twist and lock eyecups can be adjusted to your personal preference. The binocular is fully rubber armored giving you added durability and a non-slip grip. Field of View: 294 feet/1000 yards|5.6 degrees Close Focus: 7.6 feet Material type: Aluminium 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.