> Can someone explain how the modeling light works on the 550/420
> EX flashes? 

When you press the DOF preview button (EOS-3 and EOS-1V only), the speedlite "strobes" 
for 1 second.  (The modeling light function can be disabled)

> And how useful in non-studio situations is the modeling light
> function? 

Its not very practical for fill-flash situations as the ambient light overwhelms the 
modeling light.
-- 
Dave Herzstein
[EMAIL PROTECTED]
http://www.kjsl.com/~dave


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