JP 2020-173349 A↗2020Assignee: Canon Inc.Inventors: Maki Yokoya, Tomohiro InoCANON RF 600mm f/11 IS STM— 10 ELEMENTS / 7 GROUPS, 600mm f/11 (MARKETED)CANON RF 800mm f/11 IS STM— 11 ELEMENTS / 8 GROUPS, 800mm f/11 (MARKETED)