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Canon Patent Application: 16-40, 14-40mm F.40 UWA Zooms
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Canon Patent Application: 16-40, 14-40mm F.40 UWA Zooms

In yet another patent application for the Canon RF mount, we have more optical designs for an F4.0 Ultra wide lens.

This patent application features embodiments for around two focal length zooms; 14-40, 16-40.  Both of these lenses are constant F4.0

Examples of the embodiments include;

Focal distance 14.43 21.62 40.74 
F number 4.12 4.12 4.12 
Half field angle 56.30 45.01 27.97 
Image height 21.64 21.64 21.64 
Whole length of the lens 138.31 128.15 129.29 
BF 12.84 12.84 12.84

Focal distance 16.41 23.12 38.80 
F number 4.12 4.12 4.12 
Half field angle 52.82 43.10 29.14 
Image height 21.64 21.64 21.64 
Whole length of the lens 118.88 112.53 114.89 
BF 12.78 12.78 12.78 

Japan Patent Application 2019-066653

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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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