Originally posted by woof Not true. Not even close. It's not even many. Here's the list that I've been able to run down and verify. Please see:
Thoriated Camera Lens (ca. 1970s)
SMC Takumar 50mm f1.4 (Asahi Optical Co.)
Super Takumar and SMC 35mm f2.0 [49mm filter ring] (Asahi Optical Co.)
55mm f2 (Asahi Optical Co.) (This may not be true.)
Super Takumar 6x7 105mm f2.4 (Asahi Optical Co.) (not even 35mm)
Super-multi-coated Macro-Takumar (Asahi Optical Co.) - not sure which one.
Yellowing is the hallmark of the "radioactive" lenses. Very few of the Takumars yellow with age.
woof
wlank was just kidding around more than anything woof, and we all knew it
Anything to get a good lens for free.
I actually own a Super Takumar 50mm f1.4 (1965 era, non coated)which is good. I don't believe that it was treated, but it also wasn't taken care of which is probably why it's clear.
Plus a Super Takumar 35mm f2.0 (non - coated, 1966) which was in wonderful shape when I got it. However it was yellowed, so I had to treat it in the window) and it's good now.
I love both lenses, and wouldn't trade them for anything.