Canon Patent: 35-600mm f/4-7.2 Zoom Lens For The RF Mount

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Here is a new Canon patent application. As so often lately, this one too refers to an RF mount lens.

Canon patent application 2021-193435 (Japan) discusses optical formulas for what could be a very interesting zoom lens for EOS R photographers. Indeed, it could be the mother of all zoom lenses. A RF 35-600mm f/4-7.2 zoom lens (example 4, below) is discussed in the patent literature (along with a 24-300mm lens).

Example 1:

  • Focus focal length 24.74 76.74 387.90
  • F number 3.60 5.30 6.50
  • Half angle of view 39.51 15.75 3.19
  • Image height 20.40 21.64 21.64
  • Lens total length 194.51 241.18 287.86
  • BF 13.32 48.47 46.4

Example 2:

  • Focal length 24.72 69.39 289.87
  • F number 3.60 5.30 5.88
  • Half angle of view 39.53 17.32 4.27
  • Image height 20.40 21.64 21.64
  • Lens total length 168.78 202.25 235.73
  • BF 13.34 39.12 36.81

Example 3:

  • Focal length 28.81 94.89 484.70
  • F number 3.60 5.30 7.20
  • Half angle of view 35.30 12.84 2.56
  • Image height 20.40 21.64 21.64
  • Lens total length 194.00 240.17 286.34
  • BF 13.85 43.81 39.37

Example 4:

  • Focal length 33.05 140.67 581.87
  • F number 4.10 5.90 7.20
  • Half angle of view 31.69 8.74 2.13
  • Image height 20.40 21.64 21.64
  • Lens total length 218.72 276.34 333.97
  • BF 14.32 39.28 46.78

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

[via asobinet.com]