Kenta Fujita — Lens Patent Author | Surface & Stop

Kenta Fujita2 related patents across 2 interactive lens diagrams.
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Sigma Corporation (2)
Sigma Corporation(2)JP 2013-104994 A↗2013Assignee: Sigma Corporation
Inventors: Kenta Fujita
SIGMA APO Macro 180mm f/2.8 EX DG OS HSM— 19 elements / 14 groups, 180 mm f/2.8 marketed; 174.60 mm f/2.92 design
JP 2019-117419 A↗2019Assignee: Sigma Corporation
Inventors: Kenta Fujita
SIGMA 20mm f/1.4 DG HSM | Art— 15 elements / 11 groups, Patent f = 20.69 mm