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Canon Patent Application: Canon RF 8-15mm F4.0 Fisheye
One of Canon's more unique lenses for the EF mount is the Canon EF 8-15mm Zoom fisheye lens. It appears that Canon feels it should be repeated on the RF mount as well.
This patent application describes a fisheye lens with a zoom from 8mm to 15mm. With a distinctly short backfocus distance, this is certainly for the mirrorless mount.
One of the embodiments is shown below;
focal length 8.10 11.97 15.07
F number 4.10 4.10 4.10
Half angle of view 91.51 90.00 90.32
Image height 11.50 17.00 21.50
Lens total length 111.33 107.33 108.91
BF 13.13 24.44 31.63
Japan Patent Application 2020-166234