While your points are well taken, the feedback would still be of
value. If all lenses above a certain serial number had no yellowing,
and all below a certain number did, that would be valuable info
regardless of other factors.
Don
--- whunter <whunterjr@xxxxxxxx> wrote:
> 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
> >
=====
Don Shedrick
http://groups.msn.com/firstlightimaging
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