Canon EF-M 15-50mm f/3.5-5.6 IS STM mirrorless lens patent

Canon has patented a new wide-angle to standard zoom lens in Japan. It is the EF-M 15-50mm f/3.5-5.6 IS STM lens designed for company’s mirrorless interchangeable lens system.

From the patent application we can see that Canon is working on a new wide-angle to standard zoom lens with a maximum aperture range between f/3.5-5.6. If becomes available, it will be aimed at Canon EOS-M mirrorless cameras.

We can also say the upcoming optic will feature STM motor for silent and fast AF operation. Sure the IS designation refers to image stabilization technology. 

Canon patent for EF-M 15-50mm f/3.5-5.6 IS STM lens


  • Patent Publication No. 2016-75742
    • Published 2016.5.12
    • Filing date 2014.10.3
  • Example
    • Zoom ratio 2.94
    • Focal length 16.00 27.43 47.04
    • F-number 3.62 4.50 5.82
    • Half angle of view (degrees) 37.55 26.47 16.19
    • Image height 12.30 13.66 13.66
    • Overall length of the lens 78.86 74.05 77.88
    • BF 20.48 27.14 37.06

Canon EF-M 15-50mm f/3.5-5.6 IS STM lens patent describes a with a 35mm equivalent of 23-76mm and a maximum aperture of f/3.5-5.6. This is one of the many mirrorless patents filed by the company.

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