A short time ago I was shooting with a Tamron 18-270mm zoom lens on a Canon EOS 40D and discovered something very surprising. When I reviewed the images of some leaves that were backlit against a bright sky I didn’t see any DPF. You know what DPF is, of course: Dreaded Purple Fringe. It usually inhabits the contrasty edges that separate highlight and shadow areas in some digital images. I’d upload an example, but I know you have plenty of your own.