Just playing around here with a quick and easy macro setup to see how it would do. All images captured with the 1DsMII, 580EX flash with diffuser, 300mm f/4L & 25mm extension tube, off monopod. My preferred configuration is the 180mm macro, with twin macro flash....but this is a much easier setup to carry in the field when pack space is a premium. I shot the camera at EV 0, but dialed the flash down to -3 EV in order to keep the flash assist more subtle. Auto focus used on all.