Canon filed a new patent for an RF 8mm f/4 circular fisheye lens: Focal length: 8.10 mm F-number: 4.00 Half angle of view: 90.84 Image height: 11.50 mm Lens length: 66.13 mm Back focus: 13.21 mm More Canon EOS RF mirrorless lens patents can be found here:
Canon filed a patent (20180314060) for a new RF wide-angle full-frame mirrorless zoom lens. As it is typical with lens patents, three different calculations were presented – 14-21mm f/1.55, 12-20mm f/2.0 and 16-32mm f/2.8: