Has anyone else experienced this problem? I had a Minolta XTSi, stored it in a hard case for a few years and later found the focusing screen had discoloured down the centre. It's a rainbow discolouration similar to the look of plastic through polarized lenses. I recently bought another XTSi kit (really just for the 75-300mm zoom) and noticed this XTSi has the same problem. This has never happened to any other camera I've owned, at any age. Any thoughts?