Canon News discovered a patent application that features a Canon RF 24-80mm f/4. It's almost a given that like the EF mount, Canon will come out with a f/4 set of zooms for the RF mount, especially since Nikon has already released an f/4 UWA and normal zoom.
Canon RF 24-80mm f/4 patent:
- Focal length: 24.72mm 48.09mm 82.45mm
- F number: 4.12 4.12 4.12
- Half angle of view: 41.19° 24.22° 14.70°
- Image height: 21.64 21.64 21.64
- Total lens length: 119.50mm 134.52mm 149.55mm
- BF: 13.50mm 18.71mm 22.73mm