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Occasional Contributor
Posts: 18
Registered: ‎08-11-2018

Re: problem with new(ish) 80D and 400mm

FWIW, the lens + TC was already mounted, and had been previously used with no issues. Unless I hit some other button, I do not think that the lens mounts were touched.
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Posts: 11,001
Registered: ‎12-07-2012

Re: problem with new(ish) 80D and 400mm

Reset it.

EOS 1DX and 1D Mk IV, even less and less other stuff.
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