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Author Message   Jan Dvorak Rating: N/A Votes: 0 Posted on Thursday, April 21, 2005 - 12:36 pm:    Hello Tony, Yes, there were at least three versions of the Summitar. It was made from 1939 till 1953, the shape of the diaphragm blades changed on the post-war lenses and as you found out the mechanical design went through changes as well. The felt can be a problem on all collapsible Leitz lenses and extra care has to be used on disassembly as well as re-assembly. Good luck, Jan