[PRODIG] Chromatic Aberrations/Lens for Canon D10

[Dan Atkin]

Hi   I have a Sigma 20-40 f2.8 DG lens on a Canon  EOS 10D and the images produced show some "purple fringing" on mainly white edging. I understand this is caused by chromatic aberrations in the camera lens and I read subsequently the 10D produces fringing unless used with a first class lens (such as Canon's own �1300+ 16-35mm).   Does anyone know whether this problem can be overcome by tweaking the camera? Does anyone know what lens, fixed or zoom, works well with the D10 without this problem or am I stuck repairing images in PS until I can afford an expensive lens?   Thanks   Dan Atkin