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Canon Patent: RF 16-28mm Lens That Might Be f/2.8 or f/2.8-4 or f/4

Canon Patent
Drawing from the patent literature

Here is a Canon patent application for a lens that might hit the shelves, sooner or later: RF 16-28mm.

Canon patent application 2022112179 (Japan) discusses optical formulas for an RF 16-28mm lens. Three optical formulas are discussed in the patent literature:

  • RF 16-28mm f/2.8
  • RF 16-28mm f/2.8-4
  • RF 16-28mm f/4

From the patent literature:

A zoom lens that is compact and has a wide angle of view while achieving high optical performance with little variation in aberration during zooming, and an imaging device and an imaging system having the zoom lens.

A photographing lens with a half angle of view exceeding 35 degrees is called a wide-angle lens, and is suitable for photographing a vast landscape by taking advantage of the wide angle of view. A wide-angle lens needs to satisfactorily correct distortion and curvature of field, which worsen as the half angle of view increases.


It is an object of the present invention to provide a zoom lens which is compact and has a wide angle of view, and which can obtain high optical performance with little aberration fluctuation during zooming, and an image pickup apparatus having the zoom lens.

Example 1

  • Focal length: 16.45-27.50
  • F-value: 2.88
  • Half angle of view: 52.70-39.08
  • Image height: 19.00-21.64
  • Total length: 138.01-127.30
  • Back focus: 14.00

Example 2

  • Focal length: 16.45-27.50
  • F-value: 2.88-4.00
  • Half angle of view: 52.740-38.91
  • Image height: 19.00-21.64
  • Overall length: 121.56-117.50
  • Back focus: 14.21

Example 3

  • Focal length: 16.45-27.50
  • F-value: 4.10
  • Half angle of view: 52.69-39.09
  • Image height: 19.00-21.64
  • Overall length: 124.60-121.49
  • Back focus: 14.08

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

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