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Canon Patent Application: Canon RF 14-35mm F4L mentioned
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Canon Patent Application: Canon RF 14-35mm F4L mentioned

Another patent appliation from Canon has surfaced. This is a slightly different patent though, as it really doesn't define the lenses from a patent perspective, but is actually discussing a underwater housing for these lenses.  The lenses are described as examples to the actual patent.  But what I find curious is the lenses themselves, one of them have been clearly rumored to be coming in 2021.  That is of course, the Canon RF 14-35mm F4.  The lens is certainly mentioned in the patent in great detail, as much as you would expect from an actual optical patent.

Canon RF 14-35mm F4L

Focal length           14.8  21.58   32.85
F number                4.1    4.1    4.58
Half angle of view    55.62  45.07   33.37
Image height          21.64  21.64   21.64
Lens total length    244.83 244.83  244.88
BF                    16.76  16.76   16.76

Canon RF 17-40mm F4L

focal length          17.33  23.76   38.46
F-number                4.1    4.1     4.1
half angle (degrees)  51.31  42.32   29.36
Image height          21.64  21.64   21.64
total lens length    140.59  135.9  140.61
BF                    26.31  26.31   26.31

This embodiment is also curious, as it's a 24mm F2.8 prime.  It's pretty large though 79mm after you deduct the back focus distance.

Canon RF 24mm F2.8

Focal length         23.94
F number              2.83
Half angle (degree)   42.1
Image height         21.64
Lens total length    99.77
BF                   17.95

Another embodiment, however these lenses are large, I can't see them being made.

Canon RF 20mm F2.8

Focus distance        19.33 
Fnanbe                 2.92
Half angle (degrees)  48.22
Image height          21.64
total length         182.37
BF                    17.97

Japan Patent Application 2020-190696

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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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