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Canon Patent Application: Canon RF 50mm F1.4
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Canon Patent Application: Canon RF 50mm F1.4

I can think specifically of one person waiting for this lens.  This is a patent application that describes a rather complex 50mm F1.4 full frame lens, with a pretty short back focus distance.  Even though I think the back focus distance may be too short, I also think it's doable.  Will we see this lens? It's really just a matter of time that we'll see this one or another optical derivative.  This patent application is curious "all about the 50mm F1.4" no other embodiments, which is actually, fairly unique.  Basically in this patent application, Canon is looking to decrease the weight of the focus elements so they can speed up the auto focus.  If I had to guess they want to put nano-USM on this.

Canon RF 50mm F1.4

Focal length                  48.49  
F number                       1.45  
Half angle of view (degrees)  24.04  
Image height                  21.64  
Lens total length            116.56  
BF                            13.23  

Canon Patent Application 2020-181071


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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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