I have a Tair-33 lens that I want to use on my Pentacon 6TL but I am unable to identify the mount I assumed it was a Keiv-88 thread as other Tair-33 lenses I have seen have this but its not because I got an adapter for it and its nothing like it, mine has a 65mm wide screw mount thread,so if I can identify the mount I might be able to get an adapter. can any one help