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Canon Patent Application: Consumer Grade Primes for the RF mount
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Canon Patent Application: Consumer Grade Primes for the RF mount

This patent application has a series of small primes of moderate aperture, which we all need. However all the lenses are under the image circle size for full frame. So I would presume these lenses are for full frame image circle and software stretched to fit.  

As Canon states;

To provide an optical system having good optical performance, easy to manufacture, and compact

I would suspect these lenses if they were ever made would be all under $300, and even then I'm not sure I'd even buy them.  However, small and light primes, even if you are slightly resolution disadvantaged would have their uses. However, personally, I don't like this trend.

Canon RF 28mm F1.8

Focal length             28.60  
F number                  1.85  
Half angle of view       37.10  
Image height             20.15  
Optical total length     81.00  
BF                       13.20  

Canon RF 20mm F1.8

focal length             20.60  
F number                  1.85  
and a half Angle of view 46.40
Image height             18.71 
Optical total length     84.87  
BF                       11.00 

Canon RF 24mm F1.8

focal length             24.72  
F number                  1.85  
and a half Angle of view 41.20
Image height             19.34  
Optical total length     81.00  
BF                       11.00

Japan Patent Application 2022-020096

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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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