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Patent: New Lens Patent for Canon EOS M System

patent-canon-eos-m

A patent was filed by Canon for the EOS M system. The patent read a new supertelephoto zoom optical formula for the EOS M system and was presented in the form of an EF-M 70-400 f/4.5-7.2 STM.

Below are the listed specs of the patent:

  • Zoom ratio 5.58
  • The focal length f = 69.59-251.52-388.00mm
  • 4.68-6.30-7.00
  • Half angle ω = 11.11-3.11-2.02 °
  • Image height 13.66mm
  • Overall length of the lens 155.01-227.97-240.02mm
  • BF 15.81-37.15-46.87mm
  • Inner focus

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