In article , Thomas Heide Clausen <omlist@xxxxxxx> writes
I read somewhere that strong UV radiation should make the yellowing
disappear. Of course, it was on a Pentax mailing list, and I cannot
find the posting claiming that. Any of you guys out there, skilled in
the issue of radioactive lenses, who can either debunk that or
confirm it as a possibility for such unfortunate lenses.
55/1.2 is a cool lens otherwise, btw....
I can't fully debunk it, but I think it is unlikely, due to the nature
of the problem. The yellow is damaged silicon compounds in the glass as
a consequence of the radiation and I cannot see any way that exposure to
UV would repair this. That said, it isn't something I have tried, so I
could be wrong - I just can't visualise a mechanism that would make it
work at the moment.
Years ago we used to supply video cameras to the main UK nuclear
reprocessing plant for monitoring systems - great business because every
six months they had to replace most of the cameras because, amongst
other damage, the lenses went brown - and I do mean brown, not pale
yellow! If UV exposure would have cured the problem I am sure they
would have found it and saved themselves a fortune. ;-)
--
Kennedy
Yes, Socrates himself is particularly missed;
A lovely little thinker, but a bugger when he's pissed.
Python Philosophers
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