The only thing is that if you use DOF, an object in the distance will remain sharp reflected in an object nearby. I presume. That would not be accounted for whith changing the shader. But we are talking checkerboard/chrome ball situations then, in the real world noise will do the trick. Be prepared to send your render times through the roof though. I wanted bump on a sandy beach and my G4 double processor was chewing on it for two and a half day. Hoof