Re: Canon Speedlite Transmitter ST-E2
It is a known problem with the Canon EX flash units (with the exception of the 580EX II) that they don't behave nicely with the optical slaves, and it has to do not with the custom functions, but with the electronics of the flash not dropping the residual trigger voltage all the way down to zero which is needed for the SCR in the optical trigger to release the circuit and allow a reset.
A Special Sync Cable with embedded electronics will allow a standard optical slave to work correctly with the Canon EX flash units.
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