EOS Jury-rigged Diffuser

[Roger Eichhorn]

Is it reasonable to jury-rig a diffuser for the built-in flash on a  
Canon 10D?  I know it works because I tried with the cut-off bottom  
from a foam cup.  I exposed an ivory colored brick wall with ambient  
incandescent light, the internal flash and the internal flash with  
the cut-off bottom of a foam cup attached.  The ambient light gave an  
orange cast, the internal flash was close to the true colors and the  
flash with the internal foam cup attached was a deeper orange-ish  
brown.  I used the p mode and the camera was tripod mounted.  Is  
there a camera setting that would allow this to work, or doesn't the  
camera know how to accommodate the drastic indignity I've done to its  
internal flash?  I'm waiting for the arrival of a 580EX, but I'm sure  
its learning curve will be so steep that it will be several months  
before I'm facile with it.

Roger
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