I understand that TTL flash means the flash will preflash and try to calculate the right exposure for that particular scene. That part makes sense, but what exactly is the "right exposure"? Does it use the same 18% rule? And is it using the same metering mode that is used for the normal exposure?
So say, if you are using spot metering and you are pointing into a pitch black background. I guess what's going to happen is, TTL will preflash and the metering will pick up the fact that flash isn't doing much. It's going then tell it to go to maximum power? But this could thrown things off in the foreground?
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