I'll be shooting with a 5D2 and 70-200 f/2.8 IS II. Thanks for the DOF calculator and tips. So if i read this correctly, i can focus on anything within the calculated depth of field and everything within it will be sharp? So it doesnt matter what i focus my center focus point on?

Btw, I only plan to use one umbrella if we go outside because I don't trust anything other than my wife to hold it. I've read about stands coming down even when anchored a few too many times.