BTW A system which *really* changed the mount twice was Mamiya (their 35mm system). Their ZEX system was way ahead of others at its time but it meant a second change in lens mount within 2 or 3 years. The ZEX mount was the first fully electronic lens-body interface.
Mamiya changed their 35mm system mount more than twice.
They used the 42mm screw mount through 1975, adding the XTL bayonet in 1971. The 1971 NC1000 had a different bayonet.The electronic ZE mount, not compatable with the NC mount appeared in 1980.
Regards, Ed
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