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Posted

"No alphas . . . just betas and gammas", as the caption reads on these YouTube videos of geiger counter testing of lenses from the 1970's with thorium oxide used in the glass elements.

http://www.youtube.com/watch?v=v5TvTPz34qk

http://www.youtube.com/watch?v=3ozOMssiP2E

http://www.youtube.com/watch?v=w3OTHyaz1uw

More on this here . . .

http://petapixel.com/2012/10/11/a-look-at-the-radioactivity-of-old-manual-lenses/

http://photo.stackexchange.com/questions/14483/what-kind-of-dose-can-you-expect-from-a-radioactive-lens/14488#14488

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

A lot of these lenses available on Ebay. The Takumars are optically superb!

  • 3 weeks later...
Posted

So MJP...you glowing in the dark yet?

I haven't got any Tak's. I was into M42 but the PK adapter was doing my head in

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