I played around with one of my tubes and my new lens on my lunch break. I had to do it in my truck, because it was windy and the security guards on campus tend to frown on my big camera. Both shots are handheld.

Canon EOS 30D, EF 24-105mm f/4L IS, Kenko 20mm AF DG Extension Tube...

f/13, 1/200, 105mm


f/22, 1/160, 105mm