An optical formula patent application for an 8-15mm fisheye zoom lens has appeared at the USPTO.
The patent covers both the APS-C (EF-M) and full-frame (RF) mirrorless mounts as the backfocus for each embodiment is well shorter than the EF's 44mm.
APS-C embodiment:
Focal length: 5.30mm – 9.51mm
F-number: 3.50 3.50
Angle of view: 181.00° 182.00°
Image height: 7.50mm 13.50mm
Total lens length: 77.28mm – 69.52mm
BF: 11.09mm 16.77mm
Full-frame embodiment:
Focal length: 8.01mm 15.30mm
F-number: 3.78 4.60
Angle of view: 177.30° – 183.10°
Image height: 11.15mm 21.64mm
Total lens length: 105.23mm – 103.57mm
BF: 12.00mm 28.46mm
This means the RF lens would be about 2 cm shorter on EOS R bodies (103.57 mm -20 mm=83.57 mm, same length, but w/o 20 mm adapter).
Impressing.
For now, releasing those zooms and two versions of the 85/1.2 should keep them busy for now, and I think a pricey but sharp RF 100-400/3.5-5.6L IS zoom would sell well and make some profit for them as well.
It is not only nice to have a native RF lens it will be also interesting, what the different optical formula (still 2 cm shorter) will deliver.
Interesting times.