How to Fake depth of field with lens blur in Photoshop

Want to blow out everything behind a foreground object but don't have $500 to drop on used DSLR camera? Then the filter trick outlined in this 17-minute Photoshop CS4 tutorial is for you. Using lens blur, one can create convincing depth of field reminiscent of a view camera or a wide-aperture lens. This technique is complex and requires some real observation and thought, but can produce beautiful results.