Geoff wrote:

Ed Ruf (REPLY to E-MAIL IN SIG!) wrote:

Preflash to determine exposure?
--
Ed Ruf Lifetime AMA# 344007 )
http://EdwardGRuf.com



I don't think it was that because that normally happens immediately
before the main flash and is barely detectable. Also, this first flash
is happening once the shutter is open, so ruins the effect I'm trying to
acheive by having rear curtain set.

Are you sure of that? If that were so, then you would have enough
exposure from the first flash to freeze the moving subject slightly.

Note that in the presence of some light sources, such as mercury vapour
lamps, a 1/10S exposure will result in about 6 weak images of the moving
subject and then one last fully exposed frozen subject image.

Post some images of whatever you're getting.

Cheers,
Alan

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