Here is the latest patent for Canon RF 70-200mm f/4L Internal Zoom Lens.
The company already has the 70-200mm glass for RF-mount. It is their first RF mount internal zoom lens: RF 70-200mm f/2.8L IS USM Lens (B&H Photo Video/Adorama/Amazon). This lens turns out one of the best selling lenses currently. According to latest Canon Japan patent, Canon may also announce a new RF 70-200mm f/4L internal zoom lens.
You can take a look at patent details of this lens:
Canon RF 70-200mm f/4.0L
- focal length 72.00 133.20 194.00
- F-number 4.10 4.10 4.10
- Half angle of view (degrees) 16.72 9.23 6.36
- Image height 21.64 21.64 21.64
- Total lens length 202.98 202.98 202.98
- BF 38.71 38.71 38.71