In reading through the 550 EX manual I recalled that there was a setting to turn off the master flash thereby turning it into just a wireless controller for a remote flash. I have an upcoming event where that would be nice to have this feature so I decided to test it.
Drats! I can't seem to make it work. I have both flashes set to same channel I go through the setting to turn off the master light which starts to blink the little symbol next to the flash head symbol confirming it is set, but the flash still fires? I tried switching flashes and using the other as the master, still same result, both flash (they are two 550ex's by the way). Any ideas what I might be doing wrong?
In the chance it might be a camera issue, I tried both my 1ds MK II and 10D, both same result.