> 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....
I believe that the 550EX must flash to trigger the slave units. You could
set it to manual 1/128, and it would still trigger slave units & you could
use ratios, etc. To get something that wouldn't flash you would need the
ST-E2. If you don't need the extra flash, might as well save your money..
- Stuart.
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