Auto-Exposure doesn’t work or not as expected. In real-world camera exposure is lowered when we have area directly exposed to Sun and exposure is increasing when we move to shadow area. In D5 it is completely not noticeable.
real world camera :
Years ago I made script for Cinema 4D that take into account relative direction between camera and Sun. If Camera is directed toward Sun, camera exposure is automatically increased by user’s given value.
I think that something like that should be implemented in D5 if calculating overall scene brightness is a problem - it is easy to do.