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Author Topic: Another EF 100-400 Patent  (Read 2230 times)

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Another EF 100-400 Patent
« on: November 05, 2011, 08:28:36 AM »
Canon EF 100-400 f/4-5.6L IS Patent We’ve previously shown a 100-400 in a patent, and it appears a second patent for nearly the same optical formula has come about.

EF 100-400 f/4-5.6L IS Optical Formula Patent

Example 1

  • Focal length f = 102.20 – 390.01mm
  • Fno. 4.10 – 5.90
  • Half angle of 11.95 – 3.18 °
  • Image height 21.64mm
  • Lens Length 228.18 – 288.12mm
  • Back Focus 51.23 – 69.84mm
  • 3.82x zoom ratio
  • Lens Construction 14 group of 19 images

Source: NL, PR via EG

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« Last Edit: November 05, 2011, 08:35:39 AM by Canon Rumors »
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Another EF 100-400 Patent
« on: November 05, 2011, 08:28:36 AM »