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Good question, I'm interested in this as well. Was reading a great bit of info the other night (can't remember the website sorry) about dslr imaging and it was recommended that the left side of the histogram should have around about a 15 to 20% gap from the lefthand edge. The idea is to get the faint details lifted out of the noise level. Exposing any more than this would have no advantage as it would cut down the dynamic range.
Not sure if that answers your question, I'll have a look and see if I can find the website again as it has some great info.
Cheers
Jo
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