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Canon Patent Application: Canon RF 15-35mm F4L
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Canon Patent Application: Canon RF 15-35mm F4L

This is a lens I'm certainly waiting for.  We have seen rumors that an ultra wide F4 lens is coming out in 2021.  Would I get one of these.  I'm waiting for this before jumping into the RF mount to be honest. 

Canon states;

The present invention is compact, and it is an object of various aberrations including chromatic aberration to provide a well corrected zoom lens.

Make it happen Canon ;)

The 15-45mm lens design looks more realistic with a 19mm back focus distance than the 16-35mm F4 lens with the rather short back focus distance.

Canon RF 15-35mm F4L

Focus distance          15.45  24.00  33.95
F Number                 4.12   4.12   4.12
Half angle of view (°)  54.47  42.03  32.51
Image height            21.64  21.64  21.64
Lens total length      150.01 141.11 140.23
BF                      19.25  31.83  46.78

Canon RF 16-35mm F4L

Focal length            16.48  24.00  33.95
F number                 4.12   4.12   4.12
Half angle of view (° ) 52.70  42.03  32.51
Image height            21.64  21.64  21.64
Lens total length      132.09 128.84 134.21
BF                      10.35  19.54  33.20

Japan Patent Application 2020-190636

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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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