US 2004/0042087 A1↗2004Assignee: Olympus Optical Co., Ltd.Inventors: Hideyasu TakatoEmbodiment 3OLYMPUS ZUIKO DIGITAL ED 50-200mm f/2.8-3.5 SWD— 16 ELEMENTS / 15 GROUPS, DESIGN f = 52.47–202.20 mm