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Canon Patent Application: Canon RF 35mm F1.4 and RF 28mm F1.4
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Canon Patent Application: Canon RF 35mm F1.4 and RF 28mm F1.4

Last week we found the Canon RF 35mm F1.2 patent application and commented that while the 1.2's are really cool as halo products, less esoteric lenses such as F1.8 and F1.4's would certainly be nice for the masses.

In this patent application, we have just that, the embodiments demonstrate an RF 35mm f1.4 lens and a 28mm F1.4.  There were quite a few embodiments of 35mm F1.4 in here that I don't think would be suitable for the RF mount because the ingress into the mount is too extreme, so we'll simply focus on the two embodiments that do make sense.  These lenses again are by no means small, being around 120mm to 135mm in lens length. 

Canon RF 28mm F1.4

Focus distance      28.00
F number             1.42
Half angle (degree) 37.69
Image height        21.64
Lens total length  140.62
BF                  21.99

Canon RF 35mm F1.4

Focus distance      34.98
F number             1.42
Half angle (degree) 31.73
Image height        21.64
Lens total length  154.45
BF                  16.17

Japan Patent Application 2021-063966

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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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