After purchasing a 580EX II, I've been experimenting with E-TTL in both auto and manual mode. The power difference (in pure manual mode, not E-TTL) between the 430EX II and 580 is about one stop. When I fire the two with dumb radio triggers, I have to set the 580, for instance, to 1/64 and the 430 1/32 to get equal shadows on both sides of a subject.
However, when triggered through Canon's wireless setup, E-TTL seems to compensate for the power difference with both auto ratios and manual power settings. If I set 1/16 power on both flashes, I get equal shadows on both sides of the subject when I would expect to see a difference because of the differing power outputs.
Is this my imagination or does Canon correct for the power discrepancy between the two flashes?
The setup (not my doll ):
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