> What's with the "pre-flash" in ETTL mode?
> 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?
I can detect it, though the delay may depend on the body.
ie. the sequence is something like:
shutter release - pre flash - mirror up - flash
I have EOS 50e (elan IIe), so there is small but detectable
delay between the flashes. I suppose EOS 1V has less delay..
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