The High Power 15X is the highest fixed-power binocular we build—a jewel when viewing over long distances. The benefits of big glass are often overshadowed by the enormous weight of most binoculars this size. Not in this case. This Eterna is lightweight and nimble making it desirable for the long haul. Get a sharp image with the help of BaK-4 prism glass state-of-the-art phase coating and a readiness to get the job done when it counts the most. Aside from all the bells and whistles this binocular is a trooper through and through.