If you know the background is going to be overexposed you know you're going to get purple fringing where the overexposed areas meet darker areas.  Using exposure compensation will reduce the effect substantially.

Here's a shot taken in full automatic mode:

Here's a cropped portion of the image at full resolution:

Using the left arrow button to set the exposure to -1.0 gives you this image:

Using a gamma correction of 1.50 in Paint Shop Pro gives this image:

The foreground is now exposed about the same here as in the first shot, there is better color in the background, and C.A. has been reduced considerably.

Here's the same cropped area as above:

 
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