Olympus OM T10 Ring Flash 1
Was given this and was told it is a 50mm flash ring it also has a battry bow where 4 AA go and this is connect to the flash ring to make the torch as shown in the picture.
Have tested out the flash ring and it works fine fired off a friend canon 400d to make the flash work it also takes 4 AA that go into the bow that goes on top of the hot shoe.
All details can be found here
http://www.alanwood.net/photography/olympus/t10-ring-flash.html
Any questions please ask.
Even thought the tiem has been tested I am not offering any warrenty beacuse i have not tested it out on a olympus camera so no returns.