On Sun, Jan 02, 2005 at 05:58:56AM -0800, Shel Belinkoff wrote: > Paul, I took another look at the pic ... meant to ask about the purple > fringing. Is that chromatic aberration or something else. It really makes > the lens far less useful ... > > Shel > > > > http://www.photo.net/photodb/photo?photo_id=3000223&size=lg
Are you talking about the blue-ish fringe around the squirrel? That's an artifact of back-lighting through the fur, and nothing to do with the lens. If it were a lens defect you would see it around the tree branch, and you don't see anything like that on the thick branch near the tip of the tail. Just look at where the fur comes back into view along the underside of the branch, and you can see the effect is strctly limited to the fur. Or dou you mean the definite blue edge to the piece of bark on the branch above the squirrel's head, towards the join with the trunk? I don't know what caused that; it may be a lens defect, or it may be a processing artifact, or it may even be correct! Apart from that, the only blue/purple fringing I see is around branches well beyond the plane of focus.
