Leica 50mm M 2.8 Elmar

[lct]

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The only difference is the focus tab of the M6J's version as far as i know.

[UliWer]

The M6J-version of the 50mm Elmar-M had the mount of the older 2.8/5cm Elmar. This older 2.8/5cm lens had the "old" optical design of the classical Elmar opened half an f-stop. Its contrast and resolution, especially when fully opened, is far behind the new design for the M6-J-version and the Elmar M. So the M6J-version is the combination of the better mount of the old version and the better lenses of the new one. Since it was only delivered together with the cameras it is very rare and almost never found alone.

[lct]

The M6J-version of the 50mm Elmar-M had the mount of the older 2.8/5cm Elmar....

The M6J version has not the same mount as the first one AFAIK, at least my 11612 from 1962. The mount does not turn when focussing contrary to the latter's.

[woorob]

I have both the 50 2.8 and 90 4.0 collapsibles. The 50, which I bought new about 8-10 years ago, has always been a tight and perfect fit once extended. The 90 [chrome finish], which I bought recently in used but absolutely pristine condition, never "tightened" as well when extended, and exhibited the sort of issues the OP noted.

 

So I sent it to Don Goldberg for adjustment. It came back today, perfect in its extended operation, although he noted on the repair slip that there isn't really any adjustment per se for this.