The JK Series 8x42mm close focus roof prism binoculars feature BAK-4 prisms and fully multi-coated optics for crisp, clear viewing. Large 42mm objective lenses gather plenty of light to ensure the viewing image is bright even in low light conditions. Superior close focus capabilities allow you to focus on objects as close as 5 ft. / 1.5m in front of you! These binoculars are O-ring sealed and nitrogen purged making them waterproof and fogproof. Twist-up eyecups stop in three positions to provide optimal eye relief for all users. Large focus wheel turns smoothly for precise focus adjustments. Independent right diopter adjustment makes it possible to adjust the focus to allow for strength differences in each eye. The JK Series binoculars are the ideal choice for hunting, birding, hiking or fishing.