Bushnell 8x42 all-purpose, full size BaK-4 porro prism for high magnification at a distance.BaK-4 prisms for bright, clear, crisp viewing,Multi-coated optics for superior light transmission,100% waterproof: O-ring sealed and nitrogen purged for reliable, fog-free performance,Non-slip rubber armor absorbs shock while providing a firm grip,Twist-up eyecups,Large center-focus knob for easy adjustments,Longer eye relief.