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Canon Patent: RF 70-200mm f/2.8L (not the already released lens)

Canon Patent
Drawing from the patent literature

A new Canon patent application, once more for a lens for the RF mount. The patent application might appear to point to an already released lens but it is not.

Canon patent application 2021-173892 (Japan) discusses optical formulas for what seems to be a RF 70-200mm f/2.8L lens. However, as points out, the patent does not refer to the already released RF 70-200mm f/2.8L. The lens described in the patent seems to have an entirely different optical design.


  • Focal length: 73.00-195.00
  • F value: 2.88
  • Half angle of view: 16.51-6.33
  • Image height: 21.64
  • Overall length: 178.20-216.21
  • Back focus: 19.12-33.67

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

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