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Canon Patent: RF-S 16-55mm f/2.8 & RF 28-70mm f/2.8 Lenses

Canon Patent
Drawing from the patent literature

A new Canon patent application suggests there might be some truth to the rumor about an EOS R model with APS-C sensor.

Canon patent application 2022-18006 (Japan) discusses optical formulas for an RF-S 16-55mm f/2.8 lens for crop sensor, and RF 28-70mm f/2.8 lens for full-frame sensors.

Example 1

  • Focal length: 16.50-53.81
  • F value: 2.90
  • Half angle of view: 42.26-13.98
  • Image height: 14.00
  • Overall length: 103.55-129.89
  • Back focus: 14.18-10.01

Example 3

  • Focal length: 24.97-232.79
  • F value: 4.12-6.40
  • Half angle of view: 41.55-5.03
  • Image height: 19.45-21.64
  • Overall length: 140.70-210.70
  • Back focus: 12.99-52.16

Example 4

  • Focal length: 28.84-67.79
  • F value: 2.90
  • Half angle of view: 34.71-16.22
  • Image height: 19.00-21.64
  • Overall length: 141.90-158.37
  • Back focus: 12.51-27.26

The patent application was spotted by More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

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