Canon News has uncovered a complex and interesting optical formula patent from Canon, this one is for an RF 35mm f/1.4 Soft Focus lens design.
Canon RF 35mm f/1.4 Soft Focus
Focal length: 35.91mm 35.82mm 36.00mm (normal focus, under and over)
F-NUMBER: 1.52 1.52 1.53
Half angle of view: 31.07 31.13 31.01
Image height: 21.64mm 21.64mm 21.64mm
Total lens length: 133.70mm 133.68mm 133.69mm
BF: 19.05mm 19.03mm 19.04mm
An RF 35mm f/1.2L has been rumoured for some time, but this is the first we’ve seen of this type of lens.