The opticron discovery wp pc 10x50 roof prism binoculars provide exceptional optical quality in an ultra compact and waterproof design thats easily transportable and comfortable to hold the discovery wp pc series are among the smallest waterproof roof prism binoculars available on the market today its nitrogen filled magnesium construction combined with fully coated optics a minimum focusing distance of under 2m in addition to long eye relief for spectacle wearers and a tripod adapter sock