The JR-842 is a roof prism binocular with an 8x42 mm configuration. These binoculars feature BAK-4 prisms and fully coated optics for clear and sharp vision. The large 42 mm objective lenses gather enough light to ensure a bright image even in low light conditions. The JR-842 binoculars are sealed with O-rings and filled with nitrogen, making them waterproof and fog-proof. The large focus wheel turns smoothly, allowing for precise focus adjustments. The independent diopter adjustment on the right side allows for customization to compensate for differences in vision strength in each eye. The JR series binoculars are the ideal choice for hunting, birdwatching, hiking, or fishing.