Rod,that noise in the corners is due to the correction required (2 stops for the 24mm) being so extreme - it has literally ripped the file apart in those areas. It is worse in dark interiors as shadow noise is worse at the extremes...I shot the 24mm without the cf for a while and had the exact same problems. Now I use the cf always.I would not advise changing the 'kind' of light you use (eg making the gain file with flash when you are shooting ambient) as the shifts seem to be affected by the quality of the light being shot. This is why Rainer makes a gain file for every image - as I do. This is very different from colour temp - which has nothing to do with the gain file.If it's too dark for the gain file, you can push up the iso for the gain file and drop it again for the shot proper.CheersMurray
