Chromatic Aberation

Crumby's Canon 400mm f5.6 lens exhibits lots of CA under some conditions. Here is an example. Note the purple fringing on the tree branches. Crumby is fixing to have to learn how to deal with this. Purple fringing for Goddess Sakes!

Well. Since you have a 400mm lens, why not take pictures of aeroplanes. Crumby is a minor stockholder in the featured.