Nothing new here, But this is how I set up the 20D for macro photography of insects. Canon EOS 100mm f2.8 Macro lens, with the Canon 500D 2-element Close Up Filter attached. The Bogen macro bracket holds the Canon 430EX, with a Stofen diffuser attached. A Canon Shoe Cord 2 connects the flash to the camera. The flash is angled at 45 degrees to diffuse the flash even more. There is no "ceiling" to bounce to, the subject receives only a small part of the light - the flash has to work harder. This limits distance (no problem with macro). The exposure on the camera is set manually.