Another way to test it would be to place a piece of light protected,
unexposed film on top (where the filter screw is) for several hours and
then develop it and see if you have an exposed circle. A simple
dosimeter. Just about any radiation type except alpha will show up this way
Rand E.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
John Hermanson wrote:
> First time I've heard of any 50 1.4 being radioactive. The 55 1.2 has
> been discussed in detail here.
>
> John
>
>
>
> On 10/1/2008 10:28:48 PM, Mark Marr-Lyon (mark.marrlyon@xxxxxxxxx) wrote:
>
>> Very early 50/1.4 lenses also contain a radioactive element and are yellow.
>>
>> The early 55/1.2 has two radioactive elements, so appears even yellower.
>> Dawid, if
>> you're curious, you could probably find a Geiger counter at a
>> local school and find out if it is radioactive or not.
>>
>> Mark
>>
>> On Wed, Oct 1, 2008 at 7:52 AM, Timpe, Jim <Jim.Timpe@xxxxxxxxx> wrote:
>>
>>
>>> First time I've
>>>
>> heard of yellowing in anything but the 55/1.2.
>>
>>
>>
>
>
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