Attached Link: http://www.daz3d.com/support/tutorial/index.php?id=795

With Poser6, it's really easy to create depth of field: Create your image; With the camera selected, turn the dial of the "focus distance". A prop will appear to choose where you want the focus of the camera (if you change the value manually, the prop won't appear !) Set the fstop value: it give how far from the focus point it will begin to became blurry. With Poser5, i made a tutorial on DAZ3D (link above) !!! the python script work for the standard focus of the camera, ie 38 !!! The picture i made above was done using 10 pixel samples. As you can increase it until 36, it can certainly be a better quality... But it will be extremly long to render.