Julian Loke wrote:
> Hi James,
>
> Yes, the 550EX uses the main flash tube to send the wireless E-TTL
> control signals.
>
> The only alternative is to use the ST-E2, which uses a filtered red
> emitter, but with less range and angle of coverage.
>
Hi,
You could also 'simulate' the invisible effect of the ST-E2 by placing
an Infrared filter on the 'master' 550EX. Contrary to what somebody
wrote, the sensors of the 550ex can see in the near IR spectrum
(otherwise, how could the ST-E2 work?). The pre-flash is unavoidable,
given that it's the only communication between master and slave. Well,
it's the pre-flash of a wire... you can choose.
Greetings,
Gerard.
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