JP 2001-350095 A↗2001Assignee: Canon Inc.Inventors: Makoto MitsusakaCANON EF 28-200mm f/3.5-5.6 USM— 16 GLASS SUBSTRATES / 12 GROUPS, DESIGN 28.92-193.14 mm
JP 2002-365547 A↗2002Assignee: Canon Inc.Inventors: Makoto MitsusakaCANON EF 28-105mm f/3.5-4.5 II USM— 15 ELEMENTS / 12 GROUPS, PATENT EFL 28.903-101.333 mm