Quote:
Originally Posted by MarcusHoare
Rear Sync on nikon is just one flash in time with shutter - not quite sure why sony would use 2?
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Marcus, I don't know if you're not counting the preflash sequence, or if you're using some non-default flash mode like manual or FV-lock, or you simply haven't noticed it, but Nikon do use 2 flashes for the i-TTL system, a burst before the shutter opens to measure the intensity required during the exposure and the flash when the shutter is open. Try rear sync with a 1/2 second exposure. You will see the two distinct flashes.
I don't know about Sony, either, but this is what I was basing my reply upon. Seems like Peter isn't interested any more, and that no Sony users can contribute a better explanation, so we may never know.
Chris