Shizuka Takemoto — Lens Patent Author | Surface & Stop

Shizuka Takemoto2 related patents across 3 interactive lens diagrams.
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Sigma Corporation (2)
Sigma Corporation(2)JP 2001-330771 A↗2001Assignee: Sigma Corporation
Inventors: Shizuka Takemoto, Norikazu Yokoi
Numerical Example 1SIGMA 28mm f/1.8 EX DG ASPHERICAL MACRO— 10 ELEMENTS / 9 GROUPS, DESIGN f = 27.10 mmNumerical Example 2SIGMA 24mm f/1.8 EX DG ASPHERICAL MACRO— 10 ELEMENTS / 9 GROUPS, DESIGN f = 24.69 mm
JP 2002-236254 A↗2002Assignee: Sigma Corporation
Inventors: Norikazu Yokoi, Tetsusuke Kusakawa, Shizuka Takemoto
Numerical Example 2SIGMA 24-70mm f/3.5-5.6 ASPHERICAL HF— 9 ELEMENTS / 7 GROUPS, DESIGN f = 25.0-67.6 mm