Where is that DOF script available from?  I just spent an hour looking for it.  I finally found a script, in my P6 > Python > PoserScripts > RenderControl directory, named dof_p5.py.  Is this the script to tell you the distance between you camera and a figure?  I hope not, because when I have the Figure selected; and then set the Document Window and Parameter Palette to Main Camera, it does'nt matter how far I move the camera away, the python always yields a result of 0.0?  I even checked to make sure my Poser Unit of Measure is Feet.