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James Taylor wrote:
I'm a little confused. Are you saying you can control a 430EX in manual from your 580EX on camera (power settings)? You could change the 430EX from half power to full using the 580EX on the camera?
I use a 7D now, and it's all done from the camera's Flash Control menu, but on older cameras that lack this feature you can do it from the flash's control panel. You set the remote flash to a Group (probably B or C), and then on the Master you scroll to that Group and then set the power level. You'll see the Power Level indicator on the Master's control panel change from -- in your example -- "1/2" to "1/1" for that Group.
If you had three off-camera Speedlites, you could assign one to Group A, one to B, and one to C, and set each one's manual power to a different level, in 1/3-stop increments, all from the Master flash (which can be a Master-capable Speedlite, or the pop-up flash of some cameras).
The process is a little confusing/counterintuitive, because you use the "Ratio" feature even though you aren't actually setting a ratio in the strict sense as you would in ETTL mode.
Here's a screen shot of the 580EX II's Instruction Manual that explains it, and below that is the 7D Manual's page on using the camera menu to do it: