Kenta Fujita — Lens Patent Author | Surface & Stop

Kenta Fujita3 related patents across 3 interactive lens diagrams.
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Sigma Corporation (3)
Sigma Corporation(3)JP 2013-104994 A↗2013Assignee: Sigma Corporation
Inventors: Kenta Fujita
Numerical Example 2SIGMA 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
Numerical Example 1SIGMA 20mm f/1.4 DG HSM | Art— 15 elements / 11 groups, Patent f = 20.69 mm
JP 2019-219472 A↗2019Assignee: Sigma Corporation
Inventors: Hokuto Usami, Kenta Fujita
Numerical Example 5SIGMA 28mm f/1.4 DG HSM | Art— 17 ELEMENTS / 12 GROUPS, DESIGN f = 28.72 mm