[multiweb (Marc)]

Originally Posted by Steffen

On the use of thorium oxide in camera lenses and eyepieces:

http://camerapedia.wikia.com/wiki/Radioactive_lenses

Who's got a Geiger counter?

Cheers
Steffen.

Bin those lenses... no good for astro. You'll get a green glow and gradients in your subs.