canonrf400mmf28lisusm

Camera Labs' Gordon Laing was given the opportunity to test the two largest and most expensive lenses for Canon's mirrorless RF system -- the Canon RF400mm f/2.8L and the Canon RF600mm f/4L -- and has evaluated how they stack up in stills and video tests.

Canon has announced the coming availability of the RF400mm f/2.8L IS USM and Canon RF600mm f/4L IS USM, which it admits are optically identical to the original EF designs. The lenses look pretty much identical, save for what appears to be a bright silver built-in RF adapter.