I have a 40d w/ the 28-135 and just got a 430ex flash for it. I was taking a bunch of pictures new years eve and am quite happy with how they turned out(compared to my old P&S). The one thing I noticed was how shallow the DOF is. I have several pictures where a parent is in focus but the kid sitting in their lap is 'soft' looking. How can I get inside pics to have a deeper DOF?