Thread: Use a radioactive eyepiece!
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Old January 31st 13, 12:22 AM posted to sci.astro.amateur
RichA[_1_]
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Posts: 553
Default Use a radioactive eyepiece!
The Kodak Ektamate and Ektar lenses all use thorium glass. Pretty
harmless just sitting around but I wouldn't want to press my eye to
one for any length of time.

http://www.surplusshed.com/pages/item/l3759.html