Takehisa Koyama — Lens Patent Author | Surface & Stop

Takehisa Koyama3 related patents across 3 interactive lens diagrams.
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Sigma Corporation (3)
Sigma Corporation(3)JP H04-110811 A↗1992Assignee: Sigma Corporation
Inventors: Takehisa Koyama
Example 3SIGMA APO MACRO 180mm f/5.6 UC— 9 ELEMENTS / 6 GROUPS, DESIGN f = 174.86 mm
JP 2011-186095 A↗2011Assignee: Sigma Corporation
Inventors: Noriyuki Ogasawara, Takehisa Koyama
Example 2OLYMPUS M.ZUIKO DIGITAL ED 75-300mm f/4.8-6.7— 18 ELEMENTS / 13 GROUPS, DESIGN f = 76.91-290.98 mm
JP 2020-086133 A↗2020Assignee: Sigma Corporation
Inventors: Ryosuke Sato, Takehisa Koyama
Numerical Example 6PANASONIC LUMIX S PRO 70-200mm f/4 O.I.S.— 23 ELEMENTS / 17 GROUPS, DESIGN f = 72.50-193.95 mm