An updated EF 800mm f/5.6L IS is a lens I figured we would have seen already, but here we are still waiting for an update. For the moment, owning an EF 600mm f/4L IS II and a 1.4 teleconverter outperforms the EF 800mm f/5.6L IS in most of the important ways.
It looks like Canon is continuing to work on a follow-up to the longest lens in the current EF lineup.
Japan Patent Application 2018-087965
- Focal distance 780.00
- F number 5.80
- A half field angle (degree) — 1.59
- Image height 21.64 whole length of the lens 485.85
- BF 128.77
We've been told to expect new “big white lenses” some time in the next year, but we do not yet know which lenses in the lineup will see an update.