+1 on Jim Bryant's advice! Depending on the time of day and if it's sunny or overcast, I have gone down to ISO 100 too.
I prefer to shoot in Aperture Priority, that way I can keep it at 2.8 for best background separation. Shutter Priority would make your aperture bounce all over the place.
Shoot soccer all the time with my 30D and 70-200/2.8 with great results, along with AI Servo and the center focus point used.
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Hickory Hill Photography | Blog
Canon 40D & 30D | Vertical Grip | Canon 85/1.8 | Canon 70-200/2.8 IS | Tamron 17-50/2.8 | Canon 60/2.8 Macro
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