>> Julian Loke wrote:
>> I just tried this with a 550EX flash, but the slave does not
>> reset itself after the first trigger.
> Henry Posner/B&H Photo-Video wrote:
> I never heard of an optical slave that needed to be reset at
> all. They're passive switches -- they sit & do nothing until
> a flash "tickles" them.
Hi Henry,
I have a cheap "Optex" brand optical slave. It sits there
until a flash "tickles" it, then it doesn't stop laughing :-)
Until I turn off the power, or disconnect the slave.
The reason seems to be in the electronic circuitry. The sync
terminal or hotshoe on a "normal" thyristor or manual flash
shuts off after each flash, allowing the slave SCR (silicon
controlled rectifier) to reset automatically.
I suspect that the Canon EX Electronic flash sync terminal
on the shoe is always "live". The little SCR in the slave
doesn't stuck in its latched-on state.
I found a thread in Photo.net on this phenomenon:
http://www.photo.net/bboard/q-and-a-fetch-msg?msg%5Fid=000xBS
Solution?
1) Ikelite Lite-Link $$$
2) Use the 430EZ flash, which behaves fine.
Cheers
Julian Loke
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