Archived posting to the Leica Users Group, 2000/07/26

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Subject: Re: [Leica] Peeling R4 Bayonet
From: John Collier <>
Date: Wed, 26 Jul 2000 19:37:24 -0600

We are talking about a working tolerance of .015 mm. (approximately .0006 of
an inch or one half a thousandth of an inch). I am involved in the repair
side of the service industry (automobiles not cameras) and I can assure you
that is a very small amount. :-)

John Collier

> From:
>> writes:
>> Yes there are tools and procedures to follow. On the Leica M you use a
>> special tool to check for the proper distance which involves using "gauge
>> set 56". Tolerances are +0.005 mm. to -0.01 mm. The lens mount can be
>> machined and then you have to carefully use an auto collimator to check for
>> parrallelism. I do not have an "R" manual but expect it is similar.
> So then, you've corroborated what I said, that there is no designed-in
> adjustment (such as an adjustable plate or shimming) for the seating of the
> lensmount.  What you're saying, if I understand correctly, is that Leica's
> current manufacturing procedures are inconsistent to the point each mount
> requires re-machining by hand to achieve the necessary tolerances?  When is
> your manual dated?  I can imagine such a procedure being necessary in the
> days of the M3-2-4 but I truly shudder to think if it's still true today,
> given the contemporary work ethic, what the likelihood is there's actually
> someone at Leica service who actually does it "by the book" : (