I Need to locate a retaining ring for a wollensak 75mm enlargeing lens. Where can I find info on the thread size (I think it's an odd one as none of my rings in the 38-39 range fit) and where can I get a hold of the ring once I know a thread? Thanks.
There is a guy on ebay that has a bigillion retaining rings. artinprogress I rrecently bought a ring for an old compur shutter and it fit perfectly. Give him a try.