Yukihiro Yamamoto — Lens Patent Author | Surface & Stop

Yukihiro Yamamoto3 related patents across 3 interactive lens diagrams.
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Sigma Corporation (3)
Sigma Corporation(3)JP 2012-063403 A↗2012Assignee: Sigma Corporation
Inventors: Yukihiro Yamamoto
SIGMA APO MACRO 150mm f/2.8 EX DG OS HSM— 19 elements / 13 groups, f = 149.99 mm design / 150 mm nominal
JP 2019-211703 A↗2019Assignee: Sigma Corporation
Inventors: Yukihiro Yamamoto
SIGMA 45mm f/2.8 DG DN | Contemporary— 8 elements / 7 groups, f = 43.93 mm design / 45 mm marketed
JP 2023-183894 A↗2023Assignee: Sigma Corporation
Inventors: Yukihiro Yamamoto
SIGMA 50mm f/1.4 DG DN | Art— 14 ELEMENTS / 11 GROUPS, f = 48.72 mm