Tom, is the play while focusing you feel is slip before it "catches".
If so, I suspect it is still focusing during the slipping, but the
grease may be drying out. What you feel catching is the grease, but
during the loose portion of the focus, is the lens still focusing? This
has nothing to do with the focus beyond infinity for expansion
purposes. If so, the question is what is required to re-grease the
focus mechanism?
Wayne
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