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Canon Patent Application: Canon RF 24, 28, and 35mm F1.2L
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Canon Patent Application: Canon RF 24, 28, and 35mm F1.2L

It's probably a really good guess to assume that a Canon RF 35mm F1.2L is coming, and it's going to be great, big and expensive.  We've found another patent describing a possible Canon RF 35mm F1.2 and here's another patent application with some 35mm F1.2L embodiments.

For the EF system the 24L 1.4 was a great lens, and could Canon also be looking at expanding the F1.2L lineup to include the 24 and 28mm focal lengths? I'm sure for fast prime shooters it would be a tempting proposition.

The only issue I see with these embodiment for the 24 and 28mm is that the back focus distance is pretty tight for the RF mount, with a 7mm inset into the mount.  While these may not be the exact embodiments that Canon would use for such lenses on the RF mount, it's important that they are considering them.

Canon RF 24mm F1.2L

focal length          24.74  
F number               1.24  
Half angle of view    41.17  
Image height          21.64  
Lens overall length  143.97  
BF                    13.45  

Canon RF 28mm F1.2L

focal length          27.15  
F number               1.24  
Half angle of view    38.55  
Image height          21.64  
Lens total length    146.96  
BF                    13.45  

Canon RF 35mm F1.2L

Focal length          34.00  
F number               1.24  
Half angle of view    32.47  
Image height          21.64  
Lens total length    154.96  
BF                    17.05 

Also, there appears a "now-pedestrian" Canon RF 35mm F1.4L embodiment as F1.4 is the new F1.8.  As with the 24 and 28mm, this also appears to have too short of a backfocus distance.

Canon RF 35mm F1.4L

Focal length          34.00  
F number               1.45  
Half angle of view    32.47  
Image height          21.64  
Lens total length    125.96  
BF                    12.96  

Canon Patent Application 2021-092694

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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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