Canon Patents

Patent: Canon EF 28-200mm f/3.5-5.6

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A patent for an EF 28-200mm f/3.5-5.6 optical formula has been published.

Patent Publication No. 2015-172612 (Google Translated)

  • Published 2015.10.1
  • Filing date 2014.3.11
  • Zoom ratio 6.68
  • Focal length 28.90 51.17 193.10
  • F-number 3.63 4.39 5.88
  • Half angle (in degrees) 36.82 22.92 6.39
  • Image height 21.64 21.64 21.64
  • Overall length of the lens 132.70 149.90 182.70
  • BF 39.40 49.73 66.13

We’re not sure what the point of this one is, but a future patent may shed some light on the subject.

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