Thread: 550ex Flashes as Slave not in synch
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Old 02-03-2008   #2 (permalink)
Gbee
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Default Re: 550ex Flashes as Slave not in synch
It sounds like you may have the flash in ETTL mode, in this configuration there is a relay delay and the second flash fires after the shutter trip.

Both flashes need to be in M manual mode, if not, try this and see if they sync now.
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