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Originally Posted by Steve
What is the mode exactly and how does it work, I am on the verge of buying a 430EX. Currently the 430 does everything I need but I would hate to miss out on something hidden away on the 580EX that I didn’t know about.
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The flash acts as a strobe while the shutter stays open.
You get the effect of multiple shutter actuations when used with a moving subject.
See
here for an example.
And
here to see some more of Andy Harmers high speed flash photography.