The technique is called 'zoom during exposure'. Set a slow shutter speed and zoom the lens in or out during the exposure. Takes a little practice, but the results can be pretty cool. I used the same technique for my avatar photo.
Only basic PS editing; crop, minor lighting/contrast adjustment and sharpening.
Canon EOS 1D Mark II
1/5s f/22.0 at 33.0mm iso200
It only indicates one lens focal value.