The first image contained portions of two different exposures.
The first image was immediately followed by another image that contained portions of two images and had a significant color error.
The exposures immediately before and following these shots were normal. I haven't had a similar problem since.
The problem occurred in camera. I can rule out a problem with the compact flash card and any problems with downloading. I can rule out any problems with the shutter or other physical portions of the camera.
I checked the EXIF data. The only thing that I was doing differently from my normal settings was that I had set the camera to the "P" (Professional) mode. I expected to see it set to Aperature Priorty. It's possible that the dial drifted but that is harder to do on the Mark III than it was on the Mark II.
The problem had to have happened after the exposure and before the image from moved from the cameras buffer memory to the compact flash memory. After careful study in PhotoShop, I've concluded that the two problem images actually resulted from more than two exposures.
I haven't been able to get the camera to repeat the problem but I'm afraid that it will happen again when I'm working with photos that are more important.
