Archived posting to the Leica Users Group, 2011/04/21

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Subject: [Leica] OT: Yellow gone gone gone
From: simon.apekop at gmail.com (simon jessurun)
Date: Thu, 21 Apr 2011 19:02:28 +0200
References: <p06240815c9d370bc11cf@192.168.1.106> <5CFFC845-3AE6-4C2A-ACED-7408D9412364@mac.com> <p0624081fc9d4f1cd512c@192.168.1.106>

It worked for my Ektar as well clear as well glass
Simon jessurun
Amsterdam

On Wed, Apr 20, 2011 at 10:30 PM, Herbert Kanner <kanner op acm.org> wrote:
> Thanks for the kind word, George. Byron Rakitzis suggested that my
> speculation as to the cause of the yellow was probably incorrect, and
> suggested a Google search. I found a lot of information indicating that the
> yellow was due to radiation damage from gamma rays emitted by some of the
> daughter products of the decayed thorium. No information as to why a few
> hours application of UV cures this.
>
> Herb
>
>
>> On Apr 19, 2011, at 12:23 PM, Herbert Kanner wrote:
>>
>> ?> So now I concluded that the balsam was fine, and that this lens
>> had at least one thorium glass element. I headed to Ikea, where I
>> had never been before. I felt like a lab rat in a maze; everyone
>> should have that experience ONCE. By some miracle I found a desk
>> version of that lamp $9.89, assembly required! I applied the
>> recommended twelve hours of exposure, and the yellow is gone gone
>> gone.
>>
>>
>> Kudos! Herbert.
>> and thanks for the detailed and useful information.
>>
>> Regards,
>> George Lottermoser
>> george op imagist.com
>> http://www.imagist.com
>> http://www.imagist.com/blog
>> http://www.linkedin.com/in/imagist
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
>
> --
> Herbert Kanner
> kanner op acm.org
> 650-326-8204
>
> Do not meddle in the affairs of cats,
> for they are subtle and will pee
> on your computer!
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>


In reply to: Message from imagist3 at mac.com (George Lottermoser) ([Leica] OT: Yellow gone gone gone)