Wouldn't the areas not in shadow then be overexposed by a
half stop?
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I don't understand why you say a half stop, but think of fill flash as only
being a fraction of the available light on the subject. The meter in the
flash (assuming you have an automatic flash) or the OTF-TTL flash camera
combo will measure the extra light and compensate for it. Doing it manually
is still sort of a hit and miss thing but generally you are not over
exposing that much. Ric in Wisconsin.