Gerber Nautica S-ii 12X50 BAK4 Binoculars The Gerber Sport 12x50 binoculars are one of the finest binoculars anywhere and are ideal for bird, whale watching or plane spotting. Clarity and sharpness you could reach out and touch. The Gerber 12x50 Binoculars have fully multi coated optics, twist-down rubber eye cups, tripod adaptable. The Series II come with upgraded optics in BaK4 prisms for extra sharpness.