Canon News has uncovered an interesting optical formula patent for a small prime lens with image stabilization. The patent talks in-depth about making small prime lenses with IS.

There are two different embodiments for a Canon RF 19mm f/2.8 IS.

Canon RF 19mm F2.8 IS

  • ​Focal length 19.50mm
  • F-number 2.88
  • Half angle (degree) 47.99°
  • Image height 21.65mm
  • Lens total length 96.33mm
  • BF 18.34mm

Canon RF 19mm F2.8 IS

  • Focal distance 19.29mm
  • F-number 2.86
  • Half angle (degree) 48.30°
  • Image height 21.65mm
  • Lens total length 96.59mm
  • BF 18.43mm

This patent also includes an optical formula for an RF 85mm f/1.8, but I think it's safe to assume that this won't become a consumer product since we have the Canon RF 85mm f/2 IS STM.

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