Bushnell PermaFocus 10 x 50mm Binocular: * 10x magnification * 50mm objective lens * Size class: standard * Focus system: free * Prism system: Porro * Prism glass: BK-7 * Field of view at 1,000 yards: 393 feet * Exit pupil: 5.0mm * Eye relief: 14 * Eyecups fold down * Weight: 31 oz * Not water or fog proof * Tripod adaptable * Model No. 175010 * Features: * Fully coated optics for superior light transmission and brightness * Unique "Focus-Free" feature stays in focus at most viewing distances * Non-slip rubber armor absorbs shock while providing a firm grip