Patent of Canon EF-M 9-18mm f/3.5-4.5 STM Lens

EF-M 9-18mm f3.5-4.5 STM LensCanon has just filed a new patent of EF-M 9-18mm f/3.5-4.5 STM Lens. It is a wide angle zoom lens for Canon APS-C mirrorless cameras.

  • Patent Publication No. 2015-34892
    Published 2015.2.19
    Filing date 2013.8.9
  • Example 1
    Zoom ratio 1.90
    The focal length f = 9.22 14.67 17.50mm
    Fno. 3.45 4.02 4.63
    Half angle ω = 55.92 42.90 37.92 °
    Image height Y = 13.63mm
    Overall length of the lens 94.76 85.16 91.16mm
    BF 13.06 15.35 13.60mm
    Negative positive and negative positive 4-group zoom
    Inner Focus (third group)
    Video support

Source: EG

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