Continue reading...Northlight Images has done their usual weekly sorting of Canon patents to find some that may be of interest to the community and it looks like they have found one that may give some clues about future RF mount lenses. This relates well to the article from earlier today about what we expect to see released in the next year or so for the RF mount.
In this patent, Canon shows an optical formula for an RF 24-300mm f/4-5.6L IS along with two variations of an RF 24-70mm f/2.8L IS.
Included in US Patent application 2018/0252895A1:
Canon EF 24-70mm f/2.8L IS USM (two variations)
Canon EF 24-300mm f/4-5.6L IS USM
Both lenses would be obvious additions to the early years of the Canon EOS R system.