From: "Terry Danks" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: 2 grudnia 2000 20:54
Subject: Re: EOS Flash Duration of 550EX?
> What's with the "pre-flash" in ETTL mode? I understand its function but I
can
> not "see" it. Either it is very faint or it comes at such a short time
before
> the main flash I can not distinguish it. I ask because it is imperative
the
> preflash does not trigger the SB28's (slaved on SU4's) prematurely. Is it
> visible? How much time elapses between preflash and main flash? Can the
eye
> detect it or is it too short a time between pre and main?
You should see the pre-flash in the view finder, I do not know the exact
time which
separes pre-flash and main flash but it's visible, so the pre-flash could
trigger slaves.
Bye,
Rafal A. Walas
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