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Canon 400mm f5.6 in combo with the 5D3

I have not used this combo for sports, but have used it extensively for birds, both static and in flight. I would think that my application is as challenging as yours.

In my experience, the performance has been stellar. Fast and accurate AF and great IQ.

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If the combo can handle the above, I'm sure it won't have any problem with sports. If the f/5.6 aperture becomes an issue, the ISO on the 5D3 can be cranked pretty high to get your shutter speed.
 
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