Sea & Sea pre-flash emulation/ignore in DS-TTL

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DazedAndConfuzed

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I posted in general strobe forum and got no response, so I will try here.

I noticed many people complain about Sea&Sea YS-01 or YS-110a compatibility issues with their cameras in DS-TTL. Is it the fact multiple pre-flashes are used to meter the amount of light needed for the final flash?

I have a camera with 1 pre-flash and it seems to work properly in TTL mode on my topside test. I also tried it with my camera set to red-eye reduction, thus giving many pre-flashes. I see the strobe perform only one pre-flash, ignoring the rest of the red-eye reduction flashes, then lights up at the end on the main flash, and the exposure comes out properly. Not sure how it knows all the red-eye reduction flashes are not real-flashes and only do the final flash. If it knows all that, you think it knows about multiple pre-flashes, or maybe it always ignores weak flashes after the 1st flash?
 
https://www.shearwater.com/products/peregrine/

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