Archived posting to the Leica Users Group, 2002/04/27

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Subject: Re: [Leica] Film register problems for everyone?!
From: John Collier <jbcollier@shaw.ca>
Date: Sat, 27 Apr 2002 12:00:09 -0600

I finding this all a bit much to believe. Iron and aluminium castings 
contract significantly over time?! Seasoned engine blocks are not any 
smaller than brand new ones. Certainly engines do not seize up over time 
due to the cylinder diameter shrinking; even over a hundred years! 
Seasoned engine blocks have been vibrated by operation of the engine and 
this stress relieves the material of the block. That is it and not 
something you want to do to your camera.

Can LTM Leicas have film register problems overtime? Yes but it is due 
shrinkage of the cover material on the first bodies. The lens mount is 
screwed onto the body sandwiching the cover material. Owners notice that 
their lens flange has "loosened" and tighten the screws which puts the 
mount out of proper register. This happened very quickly with the 
special order leather finishes but very slowly with the vulcanite 
material.

The most common cause of the mount being out of register is from an 
impact.

John Collier

On Saturday, April 27, 2002, at 09:47 AM, dante@umich.edu wrote:

>  Leica late LTM (IIIc and
> on) and M bodies contract over time, enough to cause the body focus to
> change.

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