Nikon Prostaff P7 8x42 BinocularThe Nikon Prostaff P7 8x42 Binoculars improve on the previous Prostaff 7 series. The improvements include dielectric prism coatings which increase the percentage of light reflected by the prisms, making the image brighter; a locking diopter control which prevents the diopter from drifting once it is set for the user's eyesight; and an oil and water repellent coating on the external lens surfaces making the binoculars easier to use in the rain and