Leica 10 x 50 Ultravid HD Binocular, Black Armored - 40296 The large central focusing device enables relaxed, natural handling. New ergonomics for relaxed handling: the formed thumb supports on the rear of the 50 mm and 42 mm HD models ensure that the binoculars fit in your hands without slipping. Redesigned eyecups allow for a very comfortable positioning of the eye.