Summary: I think there are also some other factors at work maybe particular to digital cameras Look at the following Cormorant photo taken with my FZ10 with a TCON 17 telephoto extender attached If you look closely at the branch the bird is perching on there s a red fringe above it But I don t see the fringe elsewhere in the photo only on that branch Why IMO the branch itself
Image Dimensions: 600 x 450
Image originally found here.