19-04-2013, 11:27 AM
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Registered User
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Join Date: Jul 2008
Location: TINONEE . NSW
Posts: 243
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By the way you should check it out on a list of affected lenses but that Pentax lens may be radioactive! Some Super Takumar Pentax lenses used Thorium Oxide in some lens components as it has similar qualities to fluorite.
Greg. Thanks for the info on Radioactive lenses.
Seems there is various levels in the glass.The SMC Takumar 50mm F1.4 screw thread is listed. and I have the later PK bayonet.The levels on this lens is higher than background levels measured.I will do some more research.
Cheers. 
Peter.
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