Archived posting to the Leica Users Group, 2000/01/23

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Subject: RE: [Leica] Canon f/.95 vs Leica Noctilux?
From: "Jonathan Borden" <jborden@mediaone.net>
Date: Sun, 23 Jan 2000 20:12:12 -0500
 
> >
>
> Wouldn't a radioactive element in a lens cause film fog?  Seems
> strange that
> it should be purposely built in...
>
Rare earth glasses were supposedly invented by Kodak and some of these were
indeed radioactive. The Aero Ektar is reported to contain measurable levels
of Thorium.

Jonathan Borden