With a full frame pentaprism to illuminate your viewfinder there is simply no room for a pop up flash. See there is a reason for everything. I have a 580EX and compared to the popup flash on my 20D lets just say there is no comparison. It was worth every cent. I can illuminate a rather large 30m hall will the 580EX pointed up with diffuser extended and then there are no shadows or red eye.
Bert
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