Archived posting to the Leica Users Group, 2005/09/01

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Subject: [Leica] Schneideritis
From: Jim at hemenway.com (Jim Hemenway)
Date: Thu Sep 1 13:55:19 2005
References: <BF3D2FCE.532E%philippe.orlent@pandora.be>

:-)

So, if I put my 210mm, (for my 11x14) out in the sun, will those white 
spots finally disappear?  Or should I put the lens into the freezer.


Philippe Orlent wrote:

> The typical white spots in some Schneider lenses (commonly known as
> Schneideritis) are pretty harmless to the glass and absolutely not the same
> as acid markings from fungus. Just send it for a CLA and the lens will
> return fine. The exact origin of the spots remained a big question until
> recently. It seems that one of the workers of the assembly line of certain
> Schneider lenses just had a severe case of dandruft. This combined with an
> oily substance he put in his hair called brillantine made the hair 
> particles
> invisible in the lens during quality control before leaving the factory 
> (due
> to refraction of light). It is only after a number of years and after a
> chemical reaction following on temperatures above 45,7? centigrade, that
> these white spots become visible. Visible but harmless.
> At least that's what I've heard.
> 
> 
> 
>>From: David Lee <leirex@sbcglobal.net>
>>Reply-To: Leica Users Group <lug@leica-users.org>
>>Date: Thu, 1 Sep 2005 13:07:16 -0700 (PDT)
>>To: Leica Users Group <lug@leica-users.org>
>>Subject: [Leica] Schneideritis
>>
>>Hello,
>> 
>>  Can anyone educate me on Schneideritis?  What is it and what effect does 
>> it
>>have on optical performance?
>> 
>>Thanks,
>>David
>>



Replies: Reply from philippe.orlent at pandora.be (Philippe Orlent) ([Leica] Schneideritis)
In reply to: Message from philippe.orlent at pandora.be (Philippe Orlent) ([Leica] Schneideritis)