This was a particularly tricky capture. I used a telephoto lens with three Kenko extension tubes stacked on top of each other between the lens and the camera body. This gave me just enough working room (not too close, not too far) to not scare the fly and still have a reasonable depth of field.
5-29-2011, 1:30 p.m.
focal length: 135 mm (with 68mm of extension tubes)