I'll be covering a few Houston Dynamo games this year... here are a few photos from the first MLS game I've ever shot.
As with most sports you have to have a 300mm or larger lens to really be effective. The other thing is you should have a camera with a high FPS rate, preferably more than 3 (5D Mark II)... LOL! I don't have that kind of equipment, but I do my best with what I have.
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More photos from this game on my blog