In summary, the Canon EF 400mm f/2.8L IS III USM lens is a superb performer. You can view additional images in the Equipment Database, where you can add your own review, photos and product ratings.

However, the prospect of a simplified design and reduced aperture size suggests these lenses will be significantly cheaper than Canon's current offerings, like the Canon RF 400mm f/2.8 L IS USM ...

The taller the column, the better the lens performance. CA (Chromatic Aberration) is measured with in-camera corrections switched off, as far as we can know anyway. CA is well controlled ...

The 50-400mm F/4.5-6.3 Di III VC VXD is getting some autofocus improvements and support for shooting at up to 120fps.

On the plus side, there’s full compatibility with a growing range of other RF prime and zoom telephoto lenses, from the Canon RF 100-400mm F5.6-8 IS USM right up to the Canon RF 1200mm F8L IS USM.