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Canon patent for EF-M 9-18mm f/3.5-4.5 STM lens

canon patent

Something is moving in Canon’s EOS M department. Here we have another Canon patent for an EF-M lens,, a EF-M 9-18mm f/3.5-4.5 STM.

We already have an ultra wide-angle lens for the EOS M system, the EF-M 11-22mm f/4-5.6 IS STM. Will the optic formula described in the Canon patent ever hit the market? Hard to say.

  • Patent Publication No. 2016-54371
    • Published 2016.4.14
    • Filing date 2014.9.3
  • Example
    • Zoom ratio 1.90
    • Wide-angle intermediate telephoto
    • Focal length 9.22 14.05 17.50
    • F-number 3.39 4.04 4.63
    • Half angle of view (degrees) 53.07 44.12 37.91
    • Image height 12.27 13.63 13.63
    • Overall length of the lens 89.68 83.60 86.84
    • BF 14.22 15.78 16.00
  • Canon patent
    • Upon correction of the distortion, providing a constraint on stretching amount at each image height
    • Properly set the curve shape of the distortion aberration
[via Egami]
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