Depth of field for 3D
Create a depth-of-field effect on your 3D object with the 3D Zoom Camera tool (nested with the 3D Rotate Camera tool [N]). Option-click (PC: Alt-click) the area where you want to set the distance or focal plane of focus. You can also manually set the Blur and Distance parameters in the Options Bar. (The Blur is set to 0 by default, so you'll need to increase the value to see the effect.)
Adobe Photoshop CS5 Extended
By Zorana Gee