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Canon Patent: 20mm f/1.8 And 23mm f/1.8 Lenses For The RF Mount

Canon Patent
Drawing from the patent literature

And here is yet another Canon patent discussing optical formulas for lenses for the EOS R full frame mirrorless system.

Canon patent application P2021-71624A (Japan) discusses optical designs for a 20mm f/1.8 lens and a 23mm f/1.8 lens for full frame mirrorless systems. That’s the RF mount. The patent was spotted by Hi Lows Note.

Embodiment 1: RF 23mm f/1.8

  • Focal length 23.40 mm
  • F number 1.85
  • Half angle of view (degree) 42.76
  • Image height 21.64 mm
  • Lens length 89.32 mm
  • BF 11.72 mm

Embodiment 2: RF 23mm f/1.8

  • Focal length 23.28 mm
  • F number 1.85
  • Half angle of view (degree) 42.90
  • Image height 21.64 mm
  • Lens length 93.32 mm
  • BF 12.72 mm

Embodiment 3: RF 20mm f/1.8

  • Focal length 20.60 mm
  • F number 1.85
  • Half angle of view (degree) 46.40
  • Image height 21.64mm
  • Lens length 88.73 mm
  • BF 11.72 mm

More Canon patents are listed here. Some particularly interesting patent applications we think might get into production are these:

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