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

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Subject: [Leica] Leica 111c w/50mm F2.0 lens....
From: msmall at infionline.net (Marc James Small)
Date: Fri Sep 9 15:20:57 2005
References: <12f.653096f9.305351a5@aol.com>

At 12:11 AM 9/10/05 +0200, Ruben wrote:
>The old lenses scratch easy - fine scratches is not easy to see when the 
>lens is mounted and not easy to see closely
>demount the lens - hold it up against the light in an arms lenght and look 
>thru it both ways - you will se the fine scrathes enlarged and this way you 
>can better determine how serious these will affect your images. If every 
>thing else is ok on the camera - schutter curtains , times etc. it could be 
>a very nice buy!

Ruben

This simply is not true as a universal statement.

The 1.5/5cm Summarit does scratch easily as it has soft-glass elements
facing outwards but the other 5cm lenses are quite immune to such.
However, Leitz was forced to use a soft "drip coating" technique from 1946
until the Zeiss patent on vacuum-coating technology expired in 1960, and
these coatings both scratch easily and are also subject to drying out.  If
you examine the lens surface under magnification, you will see a "dry lake
bed", and that is the problem.  (Have the lens recoated and Bob's your
uncle, of course.)

Marc

msmall@aya.yale.edu 
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Replies: Reply from ruben at rhodos.dk (Ruben) ([Leica] Leica 111c w/50mm F2.0 lens....)
In reply to: Message from SCripscan at aol.com (SCripscan@aol.com) ([Leica] Leica 111c w/50mm F2.0 lens....)
Message from ruben at rhodos.dk (Ruben) ([Leica] Leica 111c w/50mm F2.0 lens....)