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Canon Patent Application: Mirrorless APS-C kit telephoto zoom
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Canon Patent Application: Mirrorless APS-C kit telephoto zoom

In this patent application, Canon is attempting to patent a mirrorless APS-C telephoto zoom.  With any telephoto, it's nearly impossible to tell what mount this could be made for, as either the EOS-M or the EOS-RF mount are very similar in back focus distances.  All these embodiments are for a 55-250mm F4-5.6 lens.  With Canon seemingly limiting the EOS-M to lenses that are 61mm in diameter, this seems very unlikely to be an EOS-M design.  Also, two of the embodiments are very close to the back focus distance of the RF mount (20mm). 

As with any patent applications, it's never a guarantee that this will end up in an actual product, but it's more insight into what Canon is researching.

Canon APS-C 55-250mm F4-5.6

focal length        56.50 135.00 245.00
F number             4.12   5.17   5.85
Half angle (°)      13.59   5.78   3.19
Image height        13.66  13.66  13.66
Lens total length  138.50 174.37 193.50
BF                  21.90  53.63  70.32
Focal length        55.03 135.00 245.00
F number             4.12   5.17   5.85
Half angle (°)      13.94   5.78   3.19
Image height        13.66  13.66  13.66
Lens total length  140.00 175.51 194.32
BF                  20.65  42.09  46.74
focal length        56.50 135.00 244.99
F Number             4.12   5.17   5.85
Half angle (°)      13.59   5.78   3.19
Image height        13.66  13.66  13.66
Total lens length  134.97 171.67 189.98
BF                  14.02  32.29  45.60

Japan Patent Application 2021-081660

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How to view Japan Patent applications.

Unfortunately, there's no direct way of linking to the patent application (sad!) however, this is the easiest process to view a japan patent or application.

  1. Go to the Japan Patent Office search page.
  2. If it's a patent application (they are usually in the format of Year-Number ie: 2017-011300) then type the patent application number into the second field down from the top where it says publication of patent application. 
  3. Click on search.
  4. Then click on the patent application number link, and there's the patent application!

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