I'm a bit late to the party but I attach a photo of my Medical/Dental 100 DX. This one is a removable lens with separate power pack, teleconverter (fits inside the front hole in the lens) and power and synch cables. I've also used it with an Olympus E-3 as the trigger voltage for the flash is not too high.
It's a superb macro lens with its 1:1 and constantly variable ratio. The ring flash seems to go for ever - I reckon both of my lenses have had over 1000 pics each - all with the flash - and so far, no problems. Of course, once the flash tube needs replacing, you are left with a heavy macro lens...which still takes beautiful pics!
