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Canon Patent Application: Another Canon RF 17-70mm Design.
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Canon Patent Application: Another Canon RF 17-70mm Design.

We have seen this particular focal range before.  This patent application has embodiments and examples for both the EF mount and the RF mount.

The focal range is a delicious 17-70 or 16-60mm and because the image height is 21.64, they are all full frame lenses.

This focal length has been getting alot of looks in Canon patent applications, which makes me think we'll see this lens actually being developed.  This as a kit lens for the EOS-RP or the EOS-Rm? Yes. Please.

The Canon EF lenses;

focal length 17.40 35.00 68.00  
F-number 3.33 4.09 5.88  
half-field angle (degree) 51.19 31.72 17.65  
Image height 21.64 21.64 21.64  
total lens length 168.42 153.33 168.42  
BF 38.32 53.44 84.11  

focal length 16.30 35.00 60.00  
F-number 3.31 4.22 5.88  
Half angle of view (degrees) 53.01 31.72 19.83  
Image height 21.64 21.64 21.64  
Total lens length 68.46 153.33 168.42  
BF 38.35 56.15 83.82 

The Canon RF lens; 

focal length 17.40 34.99 67.97  
F-number 3.31 4.12 5.88  
Half angle of view (degrees) 51.20 31.73 17.66  
Image height 21.64 21.64 21.64  
Total lens length 168.41 154.99 168.39  
BF 8.36 52.48 81.91 

Japan Patent Application 2020-012922

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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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