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

Dpreview: EOS R5 Review Canon Patent Application: F1.8 series of primes