Archived posting to the Leica Users Group, 1997/11/03

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Subject: Re: Yellow cast
From: D Khong <dkhong@pacific.net.sg>
Date: Tue, 04 Nov 1997 06:10:12 +0000
 
>I looked through my 50 f/2 lens at a white piece of paper and found that
>there was a strong yellow cast to the image. I tried this also with an 80mm
>Planar for Hasselblad and it too had this yellow cast. Is such an
>occurrence normal ? 
>
>--adi 

I vaguely remember reading that some of the Leitz glass made contained
Thorium and this gave a yellow colouration to the elements years later.
You might be holding such a 50mm lens.   However, the radioactivity is safe
and is unlikely to kill the owner.

Dan K.