Leitz parfocality

[Rene]

Guys, I've got a nice PlApo 25×/0.65, which is too short by about 0.9 mm, compared to all other 45 mm Leitz lenses I have, including 170mm with same lettering, and newer 160mm. Does anyone recognize this? It is a rather old one, with red couloured c before the serial number.
Does anybody have shims (spacers) for sale?

Thanks, Rene

[JB]

Hi Rene,

We had a thread here about this previously. Unfortunately, I can't find it. As far as I remember, someone else had noticed this, although 0.9 mm in your case is a lot!

The Leitz 25:1 are (?sometimes) a bit too short. I have one that's too short, too. I even have a Leica 25x that isn't parfocal. Maybe this is a feature of Leitz/Leica? Maybe for swapping between a 25:1 dry objective and a 100:1 oil?

Regards,

Jon

[rhamvossen]

Hi Rene, Jon,

This is interesting. I have not yet come across a Leitz 45 mm objective that was not parfocal. And I have quite a few Leitz lenses. If that objective is spring loaded maybe it's not fully retracted?

Maybe this is a feature of Leitz/Leica?

I find that difficult to believe from such a great company like Leitz. Leica, maybe. But Leitz? But then again, everyone makes mistakes from time to time............
Best regards,

Rolf

[Rene]

mmhm, solution might be on its way. Something to do with an internal ring which might have been swapped between different lenses. Clue: the previous owner had a Leitz lens which was slightly too long. 1+1=hopefully 2 

Rene

[Rene]

Resolved! Thanks Ulf.

René