While it is usually best to try and avoid situations that you know may be problematic there are times where you really want to take the shot and take care of the problems later.

When evaluating your photos you are not likely to see the purple fringing in Fit Screen view. You need to zoom in to at least 1:1 view to see if there is a problem that needs fixing.

Reducing Chromatic Aberration

Read Reducing Chromatic Aberration over at peachpit.com.