> I just got two 420EX flashes and now need something to "master"
> them. I am considering the ST-E2 and the 550EX. I am curious,
> can you use the 550EX as the master but not have it actually
> "flash" -- or, restated, does the 550EX actually have to emit
> a flash if it is to be the master of two 420EX's or can it
> just trigger the other flashes without having to flash
> itself? I hope my question is not too confusing to understand....
The 550EX can master without "flashing" (Master-Slave-Off switch set to
"Off"). However, the 550EX does command the slaves with visible light,
whereas the ST-E2 uses near-IR. The communication burst is brief and
will not contribute to flash exposure. See my web
page: http://www.kjsl.com/~dave/wireless.html
Dave Herzstein
[EMAIL PROTECTED]
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