The JR-042 is a 10x42mm roof prism binocular. These 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. The JR-042 binoculars are O-ring sealed and nitrogen purged, making them waterproof and fogproof. The large focus wheel turns smoothly for precise focus adjustments. Independent right diopter adjustment allows for focus adjustments to accommodate strength differences in each eye. The JR Series binoculars are the ideal choice for hunting, birding, hiking, or fishing.