Questioning whether I really understand this. With E-TTL, is setting FEC doing anything other than altering the flash-to-ambient ration? I've been assuming that when I set, say, -2 stops of FEC, I'm simply reducing flash output relative to the ambient exposure - in effect, creating fill flash. But like so many things about E-TTL, I could be teribly wrong! And does it act differently in P, Tv, Av and M modes? I'm using an EOS 33/Elan 7.
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