So I'm only beginning to learn TTL but from what I understand the preflash determines how much flash power to use. But the camera already exposes everything correctly for the entire scene (assuming not in M mode and no compensation dialed in) even before the preflash. So come time when the flash is added, it's not going to change the original exposure setting and hence will by definition overexpose it. Is this assumption correct?
And I guess the amount of overexposure will be implementation specific.
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