When RuleofThirds mentioned this problem for the first time, I thought of misfocussing. Some weeks ago I took a picture that was unsharp at 1/100 sec. It was clearly my fault. But I went through my pictures and saw a few that were partly not razor sharp. It was also in the centre of a picture. All the pictures had in common that the difference in light is great with a sharp line between darker and lighter parts.
Last Friday I took some pictures again with my new lens. When I had processed them I was happy because they were razor sharp. But when I looked again I saw a colour shift in the picture. My rawconverter (ART) had problems processing this picture. I could solve it quite easily by using a different setting in reducing highlights. Some weeks ago I had trouble processing a picture taken with my Lumix 14-28mm. In the picture were deep black solar panels on a red tiled roof. The sun was really out. After I had processed my pictures the solar panels had a wide red fringe around them. The solution was a bit difficult to find. The rawconverter automatically removes purple fringing. When I changed the setting to off, the solar panels were black again.
Today's lenses are software controlled. Distortion, vignetting and CA will be corrected automatically and store it in the metadata of the RAW file. The rawconverter I use, can read this information in Leica DNG files, but not in Panasonic RW2 files. Therefore I still believe that the Lumix 28-200mm can go wrong. I have an excellent copy of this lens but it happens very very occasionally. When I look at these pictures in a normal way I won't notice this unsharpness. I can only see it when pixelpeeping at 100%.
