I think Mark has it -- the ring just in front of the mount is attached to
the rest of the lens by four screws that have probably worked loose. They
are usually well sealed, but I suppose it could happen. That, or they're
stripped....
> the end of the lens will move up and down about 3/16 of an inch. The
play is
> located between the barrel containing the f stop setting and the barrel
that
> has the white main focal distance reference mark.
>
>
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