I'm struggling to figure out what I'm missing for sharpness. I'm using a 30D with 70-200 2.8. I've tried every shutter speed, iso, aperture, etc etc and I'm not figuring this stuff out. The only thing I have not used is a flash of any sort. Sometimes the player is clear, but the ball is fuzzy, or vice versa. I even bought a cheap 1.8 just to see if that amount of aperture would make a difference. Not really. Help please!