After seeing Philip Bloom's blog post about lens whacking I thought I'd give it a try. Focusing is really weird because it is literally moving the entire lens element in and out. Also it is hard to control the amount of light leaks and where it's coming from. I was hand holding the camera instead of using a handheld rig so the image shake is terrible. Tilting the lens from side to side was a lot of fun, creating that tilt/shift look. I think with practice and maybe a normal or wide angle lens this effect would be really successful.