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

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Subject: [Leica] Re: Canon F.95 vs Noctilux
From: "Jim Bielecki" <bieleckj@freeway.net>
Date: Sun, 23 Jan 2000 20:52:33 -0500
 
>>  Regarding the Canon 50mm F0.95 lens:
> > I have seen shots taken with that lens..It sucked.  It is also reputed
to
> > have contained a radioactive element, so don't put it under your pillow
at
> > night:)
> >
>
> Wouldn't a radioactive element in a lens cause film fog?  Seems strange
that
> it should be purposely built in...

I think the original poster is talking about Thorium, which was commonly
used by many lens manufacturers in the 50's and 60's in their high speed
lenses.