Thanks yauman. The situation I was most thinking about is when you are pointing the flash at the subject (I know how bad that can be)....for example, if you are outside and want some fill flash. Based on what you said, lowering the EC will affect the ambient exposure as well as the light from the flash on the subject. So, the background would go darker as would the subject.
So, under that situation, if you wanted to darken the environment but keep the subject properly exposed with the flash (assuming proper exposure was achieved on the subject with the flash prior to dialing in EC), you would lower the EC and up the FEC. Just lowering the EC would darken everything if I understand you correctly. I know manual is the better way to go, but I am just trying to understand the camera's behavior.
If I misinterpreted this, please let me know.
Thanks so much for all the effort you put in to your explanations.
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