I took a set of portraits yesterday, and for the most part I was pleased... but we were situated on a basketball court, and when someone would walk or more, the camera would shake just a little. Otherwise... I think I did a solid job avoiding contact with the camera, wireless shutter release and tripod. But... I couldn't help but think... maybe I should have gotten a heavier tripod. But then I immediately come to the conclusion... the tripod could have weighed 50 lbs... but the ground underneath it still would have shook... Any thoughts on the matter?