Sorry, Good Dr., I read further and further, and further. Shadownet, I found a post dated 2002, with you asking for someone to write a python script for calculate focal distance. http://www.renderosity.com/messages.ez?Form.ShowMessage=876578 I DO NOT WISH TO STIR UP THE POSER UNIT TO SCALE ISSUE here. I love and respect our good Dr. and have read a number of his tuts. Please forgive me for the earlier question. Mayhapp I should have stayed in the weeds! I usually don't post much here. I am more of a lurker as I lack the great skills of my betters. Thanks to all working on this project, Rance