If it's 57mm it might be some kind of adapter for Bronica cameras, they have 57mm threads besides the bayonet mount. _________________ My Flickr photostream: http://www.flickr.com/photos/chantalrene/
Sony A7, Canon 5D mkII, Minolta 7D + RD3000 and some more.....
Minolta and Konica collector.... slowly selling all the other stuff!
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