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Canon Patent Application: Canon 400mm F8.0
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Canon Patent Application: Canon 400mm F8.0

This is a curious patent describing the 600mm and 800mm F11's. While that's not particularly interesting it seems that Canon may have another of these lenses in mind, a 400mm F8.  Of course with all these patents, the embodiments don't necessarily mean something is going to get created, however, it's a curious addition, and I'm sure there would be some interest in a slightly faster compact 400mm.

Focal length        412.00  
F number              8.24  
Half angle of view    3.01  
Image height         21.64  
Lens total length   189.54  
BF                   73.20  

Canon Patent Application 2020-173350

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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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