02-07-2018 10:25 AM
I have two 600EX-RT on my ST-E3-RT.
When both flashes is set to group A, they fire simultaneously.
If I set one flash to group A and another to group B, then group B flashes a half second later.
Can't figure out if I touched a setting on the ST-E3-RT. I've tried clearing it, but it is the same.
02-07-2018 11:00 PM
Can you specify what modes and what the settings are? That will help narrow it down.