Since my last post on this issue, reviewed the web site data posted:
http://olympus.dementia.org/Hardware/misc/lensCoatings.txt
If, repeat IF, I understand the data correctly, there were at least six
varieties/formulations of MC used in manufacture of the 50/1.2. If the
archival stability of organic dye printing inks is highly variable,
BELIEVE that the stability of the organic binders for MC is variable.
Now factor this by previously addressed issues of heat, light,
humidity, pollution such as tobacco smoke, etc., and the impact of
radioactive decay falls to a small subcomponent of the TOTAL. No doubt
but what alpha radiation is an important factor, just that it is but
one link in the chain.
Feedback as to yellowing is meaningless without data re all other links
in the chain.
Bill Hunter
On Saturday, August 9, 2003, at 03:49 PM, Donald Shedrick wrote:
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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