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Canon Patent Shows RF Mount Zoom Lens That Could Be For An APS-C EOS R Camera

Aps-c Eos R

Interesting Canon patent application. Various zoom lenses for the EOS R system are discussed, with one being particularly interesting since it seems to point to an APS-C EOS R.

Canon patent application (2020-170102, Japan) discusses optical formulas for zoom lenses for the Canon EOS R system. The patent literature discusses the following zoom lenses:

Example 1Example 2Example 3
Focal length24.72-67.9024.72-116.4024.72-101.85
F value4.124.04-7.314.29-7.31
Half angle of view41.50-17.3041.80-10.3041.80-11.80
Image height19.69-21.6419.90-21.6419.90-21.64
full length101.50-141.15109.01-159.02107.52-158.03
BF12.50-24.861415-31.0113.48-35.52
Example 4Example 5
Focal length27.72-82.4515.45-67.90
F value3.53-5.883.93-7.31
Half angle of view38.53-14.7042.40-11.37
Image height19.69-21.6412.56-13.65
full length101.50-142.5071.26-113.36
BF14.16-32.5212.40-24.51
Look at example 5

As you can see from the table above, there are 24-70mm, 24-116mm, 24-100mm, 27.80mm, and, listed under “Example 5”, a 15-70mm f/4-7.1 zoom lens with an image height that doesn’t work for a full frame sensor on a mirrorless camera. However, the lens is based on the same design principles as the others, so it might be for an APS-C EOS R camera.

If you have a better understanding of the patent (or of Japanese), spotted by asobinet.com, please help me out on this. Is this really a lens for an EOS R camera with an APS-C sensor??

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

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