High quality waterproof, nitrogen-filled observation binoculars, with individual eyepiece focusing, designed for medium- to-long-range terrestrial & astronomical observations. Incorporating BAK-4 prisms & a fully broadband multi-coated optical system. The larger 20x 80 model features Individual Eyepiece Focusing (IF)and a central stabilizing bar with sliding tripod adaptor, for optimum balancing on tripod. High-precision construction using CNC machined metal components. Finished in Black Rubber & supplied in carrying case.