Speedlite 580 EX w/420 slave question
I have a 580 EX set as the master unit, and a single 420 set to slave. The 420 is set at the default A group setting. I want to have the 420 at a lower output than the 580, so I go to the ratio function on the 580. The ratio is stated as A:B. Which is A in this situation? I would assume that the master 580 is A and the single slave B, yet the 420 sits in slave group A. I guess I could run some tests, but I'm using film and I'd rather know sooner than later. Thanks.
Donald Specker
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