Ai Hoshina — Lens Patent Author | Surface & Stop

Ai Hoshina2 related patents across 2 interactive lens diagrams.
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Sigma Corporation (2)
Sigma Corporation(2)JP 2008-020656 A↗2008Assignee: Sigma Corporation
Inventors: Yutaka Kamimura, Ai Hoshina
Numerical Example 1SIGMA MACRO 70mm f/2.8 EX DG— 10 ELEMENTS / 9 GROUPS, DESIGN f = 68.91 mm
JP 2009-058817 A↗2009Assignee: Sigma Corporation
Inventors: Ai Hoshina
Example 3SIGMA 4.5mm f/2.8 EX DC CIRCULAR FISHEYE HSM— 13 ELEMENTS / 9 GROUPS, DESIGN f = 4.45 mm