Did you try upping your ISO? The main reason I don't do well with night football games is the lens I shoot with 70-300 isn't fast enough. I would need to be able to use at least an aperture of 2.8 in addition to a higher ISO. I don't know that you can control the necessary components to successfully get night action shots.
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Lori Putman flickr
~No one can drive us crazy unless we give them the keys
~~Life isn't about waiting for the storm to pass, it's about learning to dance in the rain!
7D | 300L f/4 IS | 135L | 35L | 100/2.0 | 50/1.4
430 EX, 580 EX II Speedlites
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