Opticron 8 x 42 discovery wp pc roof prism using an ultra compact optical design the discovery wp pc series are among the smallest waterproof roof prism binoculars available on the market today standing just 108mm high and weighing 391g the 8x32 sets a new standard for pocketable full size binoculars while the 8x42 and 10x42 at 133mm deliver 42mm objective performance in a body the size of many 32mm binoculars