Archived posting to the Leica Users Group, 1999/01/01

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Subject: Re: [Leica] Summicron cleaning marks. Another thing to check
From: "Terry Price (Edgecombe-Coles House)" <terry@free.midcoast.com>
Date: Fri, 1 Jan 1999 22:19:57 -0400

Joe:
Thanks for the advice. The first thing I did with the lens was to shine a
penlight through it. Everything is clear except for the cleaning marks.
I'll just have to try some pictures with it. I'll take a couple into the
sun to check flare.

   Terry   Price
  (on the rockbound coast of Maine)

>Terry,
>It occured to me to add that it is a good idea to shine a pen light through
>older Leica lenses. They sometimes have a cloudy layer on the internal
>surfaces, apparently related to an animal-based lubricant used in the past.
>It is hardly visible shen holding the lense up to the light, but is quite
>evident with the penlight test. It will cause substantial flare and loss of
>contrast. The lens can be cleaned, but the cost of cleaning needs to be
>factored into reckoning the lneses' value.
>Sincerely,
>Joe Stephenson
>+++++++++++
>Terry wrote:
>>I've just got a 50mm f2 collapsible Summicron (#1167850) that is in nice
>>shape except for a bunch of very fine cleaning marks on the front coating.
>>Will these make a significant difference in its performance?
>>
>>Terry