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Forum: Film SLRs and Compact Film Cameras 07-31-2014, 07:55 AM  
How radioactive are the Super Takumars?
Posted By jbondo
Replies: 84
Views: 67,441
I can personally vouch a little-known fact: The Tele-tak 6.3/300 has a single thoriated element. Tele-Takumar 300mm F6.3 Reviews - M42 Screwmount Telephoto Primes - Pentax Lens Reviews & Lens Database
It's buried in the middle of the lens, so it's only obvious when you rebuild it. I think there is another as well. I'll make another post after I check my records...
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