There was one of these at IBC last year. A new version appeared again this year at IBC and it’s really nice. I so hope that this becomes a real product. It fits the Sony PMW-F5 and PMW-F55 cameras (and I must assume the PMW-F3 too). It takes it’s power from the camera and will control a Canon EF lens. Aperture is controlled by a large aperture ring which has clear aperture marking visible at the side of the adapter. No fiddly knobs or dials, no power cable and a real aperture scale. In addition I believe you will get an aperture display in the viewfinder. The EF Lens mount features a large locking ring so the lens won’t twist or rotate once mounted, something essential if you are going to use a follow focus. This version was much nicer than the one shown last year. I really hope it becomes a real product as I’d like one for my F5.