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We have been told that Canon is working on an EF 100-400mm f/4.5-5.6L IS II USM equivalent for the RF mount, though the lens may not have a matching focal length range.
We have been told on more than one occasion that Canon is working on an RF 200-500mm L zoom and that we could see it in late 2020.
The same source says that the long-rumoured EF supertelephoto zoom development was killed off “quite some time ago” as focus on new lens designs moves to the RF mount.
