Like everyone has mentioned, AI Servo is great. I've switched to using the * button on the back of the camera for focusing, but I don't know if the Xti has the back focus button or not.
For several years now I've shot my 70-200/2.8, AI Servo, Av Mode at 2.8. I try to stay at or above 1/1000sec. But now the 70-200 is becoming to short now, since we are essentially playin on High School Football sized fields now.
I probably would of bumped that ISO a little bit to get a quicker exposure too.
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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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