A couple of images to show how the ringflash is coming on. The first is taken with the SB-600, iTTL hand held using Sigma 150 macro lens. The second is using the ring flash coupled to the SB-600 iTTL. A marked difference, there is still a bit of shadow, but that is down to the ringflash only having 2 lash tubes in but to me it does seem to work a lot better now that it runs off the SB-600. My next job is to get the infra red sensor mounted onto the ringflash head I am making!!!!