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Canon Patent: Focal Reducer For Mirrorless Camera With APS-C Sensor

Canon Patent
Drawing from the patent literature

Well that’s a heck of a Canon patent application. A focal reducer that gives some exciting focal length and apertures on APS-C cameras

Spotted by Hi Lows Note, Canon patent application 2021-167921 (Japan) discusses optical formulas for a focal reducer that could transform a 50mm f/1.4 lens for full-frame cameras into a 33mm f/0.94 lens for APS-C sensor cameras. Not bad, eh? Hopefully Canon will release this thing for the EOS M system.


Master lens

  • Focal length (mm): 51.46
  • F number: 1.45
  • Half angle of view (degree): 22.80
  • Image height (mm): 21.64
  • Lens length (mm): 94.41
  • Back focus (mm): 39.81

With embodiment 4

  • Focal length (mm): 33.45
  • F number: 0.94
  • Half angle of view (degree): 22.42
  • Image height (mm): 13.80
  • Lens length (mm): 91.91
  • Back focus (mm): 9.73
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