I have a 50/1.4, serial number 184276, that is most definitely radioactive.
At one point, I tested all my early lenses, and I found a couple additional
lenses that were very slightly radioactive. They did not have any
noticeable yellowing and I think they were about 100 counts per minute above
background. This is much less than the radioactive versions of the 50/1.4
and 55/1.2, which measure in the thousands of counts per minute above
background and have pronounced yellowing. I don't remember if the 100/2.8
was among those or not.
Mark
On Sat, Oct 4, 2008 at 9:48 PM, Ken Norton <ken@xxxxxxxxxxx> wrote:
> The accuracy of that claim is in question. A fellow listmember, with
> access
> to a Geiger counter, confirmed that his samples of the 50/1.4 and 100/2.8
> didn't glow in the dark. We compared serial numbers and other
> characteristics and our specimens were pretty close.
>
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