Designed for marine use 7x magnification and 30 mm diameter lenses allow you to zoom in for clear images of your subject. Fully-multicoated optics maximize light transmission for optimum brightness. Compact BaK-4 Porro prisms produce excellent image clarity and contrast. Waterproof, fog-proof and shock-proof for handling tough conditions. Internal rangefinding reticle and directional compass for measuring distances easily. Barska Deep Sea Binoculars, 7 x 30 is one of many Binoculars/Optics available through DailyDeals.io. Made by Barska.