Patents: Canon RF 28-70mm f/2.8 & 24-70mm f/2.8 Lenses

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Canon filed a patent describing 28-70mm f/2.8 and RF 24-70mm f/2.8 Lenses for Canon full-frame mirrorless cameras. It seems to be a patent on the optical system of the large-aperture zoom lenses “28-70mm F2.8” and “24-70mm F2.8” that are likely to adopt a retractable structure.

[Publication number] P2022147945
[Publication date] October 6, 2022
[Patent application title] Zoom lens and imaging device

Example 1

  • Focal length: 28.84-67.90
  • F-value: 2.91
  • Half angle of view: 32.65-17.67
  • Image height: 18.48-21.64
  • Overall length: 149.46-115.94
  • Back focus: 13.48-27.78

Example 3

  • Focal length: 24.72-67.90
  • F-value: 2.91
  • Half angle of view: 35.02-17.67
  • Image height: 17.32-21.64
  • Overall length: 150.00-130.39
  • Back focus: 9.87-27.17

Example 5

  • Focal length: 28.84-67.90
  • F-value: 2.91
  • Half angle of view: 34.77-17.67
  • Image height: 20.02-21.64
  • Overall length: 152.61-120.01
  • Back focus: 22.71-41.28

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