[Maverick007]

I have just received a 580ex speedlite to work with my 430ex that I have had for about a year. I want to use the two together 580ex as master commanding the 430ex as a slave.

I have now read the Canon instruction book and J. Dennis Thomas's Speedlite System digital field guide on how to work it but I am still confused, (or thick!!).

When you use the two together, is the master group A and the slave group B? Or, is the master just a master?

If I had 3 speedlites would that be master plus groups A & B or is it A+B+C? Told you I was confused.

The reason I ask is that I want to use the master, 580ex on camera as a mild fill light and the slave, 430ex set to one side as the main light to cast the shadows I desire on my subject.

If anyone knows how to change the settings for power to the units, help would overcome my frustration.

Terry