800mmPF or used 600 F4 & TC ?

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Is the 400 4.5 +TC faster with AFC than the 500PF alone? Yes Z mount are better it seems, but I use D850/500 as well for now..
I think I read that it is from someone who performed tests, but I think there are a lot of variables that could impact the overall results. having used both I couldn’t tell a difference in AF speed. With the 400mm + TC there doesn’t seem to be any speed hit, at least in most situations.
 
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