I'm in the weeds here. Hey, what about using a ruler object running along the z-axis setting near the sphere or focus object. Wouldn't that blur outside of the focal area? One of the pages in the above link used a tape measure looking thing ... And what's the deal with Poser Units and English Feet and/or inches. I did a search and found a thread featuring our good Dr. Is one Poser Unit 8'?!!! I'll be here in the weeds ... Rance