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Larry C:You can use any slave strobe. If you want ttl, you can get the Oly FL-20 and housing, but I can't recommend it. It's not real strong and has a very narrow beam. You can also get the Heinrich-Wiekamps bulkhead replacement, which will allow you to shoot ttl with a Nikonos cable connection to a non Oly strobe. I think Inon has a S-ttl strobe that acts like a slave, but reads the camera preflash. I don't know if the Ikelite controller will work with the Oly housing or not. I think Ikelite also has a pull through cable for the Oly housing that replaces the standard bulkhead fitting and allows you to hardwire their strobe.
bwphoto:here is a shot I did last week in Hawaii using an SP-350 in super macro mode.
http://www.kewlpics.net/stevea/hawaii06/pages/P9080151.htm