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Re: Yellowing of radioactive lens elements....Re: [OM] 55/1.2

Subject: Re: Yellowing of radioactive lens elements....Re: [OM] 55/1.2
From: Donald Shedrick <shedridc@xxxxxxxxx>
Date: Sat, 9 Aug 2003 12:49:03 -0700 (PDT)
It would be interesting to have feedback from owners of the 55/1.2 as
to serial number and degree of yellowing.

Mine is SN 134140 and is a beautiful silver nose.  When looking
through it backwards at white paper, there is slight yellow tint. 
When compared to my 50/1.8, it looks the same if I put 2 UV filters
stacked (Hoya MC)on the 1.8.  When comparing chromes of the two
lenses, the yellow of the 1.2 is barely noticeable, and only
noticeable when a direct comparison is available.

Don

--- Thomas Haegin <haegint@xxxxxxxxx> wrote:
> I'm wondering if it is to be expected that ALL
> radioactive glass Zuiko's will turn yellow eventually?
> 
> 
> As I understand the discussion so far, some people's
> early lenses are yellowed, but other were spared the
> problem. What would cause one Zuiko to turn yellow but
> not the other one? 
> 
> I would expect radioactive decay should occur in all
> of them as a function of time only rather than
> external things like environment or geographic region
> etc. where it was kept.
> 
> Thomas


=====
Don Shedrick

http://groups.msn.com/firstlightimaging

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