Here is another patent application of a wide-angle zoom RF lens for the Canon EOS R full frame mirrorless system. The product is the Canon RF 13-21mm f/2.8L Lens.
Now a new Canon patent application P2020-30251A (Japan) discusses optical formulas for a RF 13-21mm f/2.8L lens for a full frame mirrorless camera system, i.e. for the EOS R system.
Canon RF 13-21mm f/2.8L Lens Patent
- Zoom ratio: 1.58
- Focal length: 13.40 17.30 21.20 mm
- F number: 2.88 2.88 2.88
- Half angle of view: 58.23 51.35 45.58
- Image height: 21.64 21.64 21.64 mm
- Lens length: 150.15 136.89 130.04 mm
- Back focus: 20.96 25.13 29.31 mm
The Canon RF mount has the same 54mm diameter, but boasts a flange focal distance (the space between the lens and the sensor) of 20mm (24mm shorter than that of the EF/EF-S mount, thanks to the lack of mirror) and 12 electrical contacts (4 more than EF/EF-S, providing faster communication).
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