At 12:00 2/17/03, you wrote:
All,
Interesting thing here -- help please!
[snipped out monolight/slave description]
Dave,
Additional thoughts . . .
Also look in the specs for anything about a "pre-fire" (visible or IR) that
is used for the AF or AE.
3) Does the camera have a hot shoe? If so, have you tried triggering the
slaved monolights using a flash in the shoe (not a Canon type). This might
work also . . . by defeating the PowerShot's built-in flash.
BTW, I've triggered monolights with built-in optical slaves using a Metz 40
MZ in an OM hot shoe. Head is pointed at ceiling and flash cranked down to
lowest possible power. Same could be done with something like a Vivitar
283/285 (WARNING: provided it's one of the newer low voltage versions; the
older high trigger voltage ones will fry electronic camera trigger
circuits.) The Sunpak 383 Super would do just as well too; it's Sunpak's
version of a Vivitar 285.
-- John
2) Can you turn off AF and evaluative metering entirely and try shooting it
in "manual" mode, both AF and AE (this *might* turn off a pre-fire)?
I strongly suspect some form of pre-fire that is either so low powered or
close to the flash going off you cannot detect it, or tha it's non-visible
IR, and this is pre-firing your monolights. If I had to bet on it, I'd bet
on an extremely low powered visible light pre-flash for the AE (E-TTL ??)
system.
-- John
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