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Canon applies for a fisheye lens (one possible mirrorless prime?) patent
We discovered this patent, and while the full frame lens of a 15/4.0 sounds actually quite nice, there is an APS-C lens with a shorter than EF-S backfocus that would also have mirrorless implications.
Edit: as someone noted, these are 175 degrees so most likely prime fisheye lenses.
APS-C 9.5mm 4.0
Focal distance 9.50
F number 4.10
Imaging field angle (degree) 175
Image height 13.66
Whole length of the lens 63.97
BF 23.16
Full frame EF mount 15mm 4.0
Focal distance 15.18
F number 4.12
Imaging field angle (degree) 175
Image height 21.64
Whole length of the lens 130.16
BF 58.19
Japan Patent Application 2018-004726
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