As rumored before, it is confirmed that Canon will release two new super telephoto prime lenses before Photokina 2018 in September. Now according to CR, these two lenses are version III lenses, which means these could be below lenses:
- EF 300mm f/2.8L IS III USM Lens
- EF 400mm f/2.8L IS III USM Lens
- EF 500mm f/4L IS III USM Lens
- EF 600mm f/4L IS III USM Lens
We likely to see weight reduce and new design of these super telephoto prime lenses.