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Canon 6D with a 2x III extender and 100-400mm IS II lens.?
I have a Canon 6D and have decided to get the 100-400mm f4.5-5.5 IS II lens. Has anyone used this lens with the 2x III extender and could answer if the live view Contrast Detection Auto-focus works or not? I know phase detection will not, I am asking specifically about Live View Contrast Detection.
@BrianR. I have read that, and that is regards to Phase Detection AF, which I am aware will not work. I am asking about Contrast Detection AF that works differently and is only used in Live Mode. The Canon 6D does use Contrast Detection in Live view (have to search deeper, but it is in Canon's site, as well as a several photo sites) but they do not state its limits as they do Phase Detection. Contrast Detection is not limited the same way Phase Detection is.
3 Answers
- CaoedhenLv 72 years ago
I don't know the answer for sure... but I'm guessing f/9-f/11 is too dark even for contrast detect focus.
- BriaRLv 72 years ago
Your answer is on the Canon website
https://www.canon.co.uk/lenses/ef-100-400mm-f-4-5-...
This shows that with the 1.4x extender the 100-400 II has limited AF compatibility:
"AF possible only with EOS-1 series, 7D Mark II, 5D Mark III (with firmware 1.2.1) and EOS 80D" so not the 6D.
With the 2x extender no camera will AF.
The site makes no distinction between AF through viewfinder or in live view so that suggests that your 6D will not AF at all with a 100-400 plus extender.
