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

October 15, 2020
Canon Patents
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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 1	Example 2	Example 3
Focal length	24.72-67.90	24.72-116.40	24.72-101.85
F value	4.12	4.04-7.31	4.29-7.31
Half angle of view	41.50-17.30	41.80-10.30	41.80-11.80
Image height	19.69-21.64	19.90-21.64	19.90-21.64
full length	101.50-141.15	109.01-159.02	107.52-158.03
BF	12.50-24.86	1415-31.01	13.48-35.52
	Example 4	Example 5
Focal length	27.72-82.45	15.45-67.90
F value	3.53-5.88	3.93-7.31
Half angle of view	38.53-14.70	42.40-11.37
Image height	19.69-21.64	12.56-13.65
full length	101.50-142.50	71.26-113.36
BF	14.16-32.52	12.40-24.51

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: