I was interested to see some results from this, so... I went and made one myself.
30D 580 EX
ISO 400
f/22
1/60 sec.
Processed in PSCS2, as is. nothing done to any of the shots.
Here are the results I got, maybe to totally accurate but fun to try none the less..
Shot 1 without diffuser:
shot 2 with diffuser:
Interesting difference. Was the flash pointed at the subject in both shots?


And maybe even Pringles (save the lid please).
