A patent showing a lens design from that shows the ability to reverse mount for greater macro magnification has appeared.

Patent publication number 2016-206568 (Google Translated)

  • Release date 2016.12.8
  • Application date 2015.4.28
  • Reversibly attachable lenses
  • Reverse attachment detection switch
  • Switch control according to installation position

There have been a few adaptors over the years that would allow you to reverse mount certain lenses for macro usage.

Egami suggest that this patent may have been part of the EF-M 28mm f/3.5 IS Macro lens development.

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