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Canon Patent Application: Canon RF 100mm F2.8 Macro
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Canon Patent Application: Canon RF 100mm F2.8 Macro

The Canon EF 100mm F2.8 was a standard go-to macro lens, and even for portraiture for many photographers.

Canon clearly is going to come out with a full 1:1 Macro for the RF mount, it's simply a matter of time.  This patent application shows such a lens.  It certainly does not try to simplify the optical formula as the patent application details a fairly complicated element design.

A lot of the embodiments have far too short of a back focus distance to be actually practical, but there are a few that are far more likely to be used for the RF mount.

Focal length            100.56  
F number                  2.88  
Half angle of view (°)   10.96  
Lens total length       161.85  
BF                       15.26  
Focal length            100.00  
F number                  2.88  
Half angle of view (°)   11.02  
Lens total length       166.36  
BF                       15.78  

Canon Patent Application 2020-204744

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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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