Archived posting to the Leica Users Group, 1998/05/05

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Subject: Re: [Leica] 6.8 Telyts
From: Jim Brick <>
Date: Tue, 05 May 1998 21:48:52 -0700

At 07:44 PM 5/5/98 -0700, you wrote:
>The explanation given to me was that some glasses (glass being a fluid) can
>indeed flow enough in a normal span of years to cause this. Leica has used
>a number of exotic glasses, and I was told that this might have been the
>cause. Separation of the two elements had not taken place. One other person
>has related the same thing (re: a 400/6.8) to me.
>   *            Henning J. Wulff

I know glass is a liquid and I've seen old window panes that are thick at
the bottom and thin at the top. But these windows were 100 or more years
old. It's hard to believe that a lens, perhaps 20 years old (?), could do