My dad pulled some of this stuff out. He still has the nikkonos underwater 35mm camera that used this huge underwater off-camera flash. He was telling me that it works like a radio commander, flashing when the on-camera flash fires. It has a couple of cables with 3-prong connectors that look like they could hook up to a camera as well. There was also a nice vivitar flashgun with a full set of filters/diffusers, and it is the 90* adjustable variety. I don't have a "real" flash right now and would love if this would work but alas it doesn't have a hotshoe connector, just a cable that of course is for stuff way older than micro 4/3 cameras. What I can use is the two nikon "close up attachments," which are 52mm adapters that thread into a couple of nikkor lenses I already have. They are 1.5 and 2.0 diopter and I look forward to doing some Macro shots with them in the future.