Thanks again for the overgenerous comments. I have been slow to reply as I am presently on a cycling holiday in the Alps and am too mean to pay for internet access. Will post some images when I get home including a few high contrast sunsets that could give me problems rendering naturally. The view was stunning but I often find that trying to stuff 20 stops of dynamic range into 8 stops often leads to an unnatural looking end result, here's hoping. Ken