garry23, thanks for your tips, I will try to improve my results with these suggestions. My 'normal' RAW pictures are pretty good with AETTR, but I have already experienced some limits of dual iso, e.g. chroma noise on pictures with water etc., and the pictures I take in dark areas are still really bad with lots of noise, and sometimes blurred. It will take me some more experiments to figure out how to get this right.