A patent showcasing an RF 13-21mm f/2.8 optical formula has appeared in Japan.

Canon RF 13-21mm f/2.8 embodiment:

  • Zoom ratio: 1.58
  • Focal length: 13.40mm  17.30mm  21.20mm
  • F number: 2.88 2.88 2.88
  • Half angle of view: 58.23 51.35 45.58
  • Image height: 21.64mm  21.64mm  21.64mm
  • Lens length: 150.15mm  136.89mm  130.04mm
  • Back focus: 20.96mm  25.13mm  29.31mm

I doubt this specific optical formula will become a consumer product, but it is probably part of the development for an ultra-wide-angle RF mount lens that we expect to see sometime in 2020.

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