Canon Patent Application: Super Telephotos

Canon has applied for a patent that describes a few of their super telephotos. Research never stops on super telephotos regardless of when the last release was done.  

There are quite a few embodiments in this patent application;

Focal length 294.00
F-number 2.91
Half angle of view (degrees) 4.21
Image height 21.64
Total lens length 276.40
BF 65.35

Focal length 392.00
F-number 2.90
Half angle of view (degrees) 3.16
Image height 21.64
Total lens length 371.25
BF 69.92

Focal length 490.00
F-number 4.12
Half angle of view (degrees) 2.53
Image height 21.64
Total lens length 410.77
BF 66.03

Focal length 784.00
F-number 5.80
Half angle of view (degrees) 1.58
Image height 21.64
Total lens length 484.53
BF 75.94

US Patent Application 20190041606

US Patent Application 20190041605