I don't have P5, but with a real camera, you get D.O.F. blur FX when the lens diaphragm is wide open (f 1.2 - 2.8) and you're focussed on something close to the camera, depending on focal length. The focal distance is something you'd have to measure from your camera lens focal plane to the only object you want to be in focus. So you'd set the camera at 8.602 units from the figure.