US 2003/0072086 A1↗2003Assignee: Olympus Optical Co., Ltd.Inventors: Tsutomu Uzawa, Masahiro SuzukiOLYMPUS ZUIKO 9-36mm f/2-2.4 (Olympus E-10 / E-20)— 14 powered elements / 11 powered groups, f = 9.200-35.500 mm patent design