In the case of your photographing flowers with dark backgrounds, I think
this would be another classic example of what I'm talking about. The flower
would occupy the central segment, which is a tiny fraction of the whole area
being computed in for the center-weight averaging. Inotherwords, it isn't
weighting the central zone heavily enough.
However, this is an example where ESP would have made a big difference. ESP
assumes that the central part (or active focus point) is the subject and
will adjust the overall exposure to protect it.
Your example is of a worse-case, too. Those white flowers with the
Kodak-Olympus sensors are a real pain.
AG
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