Mark,
You didn't happen to test a early-serial-number 24/2.0 ?
I am still trying to get my hands on a geiger counter,
an in the meantime, am trying the UV-light (from the sun) therapy,
as I have nothing to lose.
On 05 Oct 2008, at 6:01 PM, Mark Marr-Lyon wrote:
>
> 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.
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