I haven't done much American football since the last winter season ended in March this year, concentrating more on cycling, but I did get back to Hertfordshire Uni today to shoot a game between the Hurricanes & Bath Killer Bees,
The lighting was bloody awful, gradually getting worse as the game went on. The floodlights came on in the second half but didn't improve matters too much. I put the 600mm away once I got to ISO 4000 at 1/640sec and got out the Sigma 300 f2.8, but that lens isn't anywhere near as fast focusing as the 600 even though it's a lighter lens so lots of out of focus shots.
I didn't find the right solution from the internet.
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