Here's the classic repair for a yellowed radioactive Pentax 50mm -
http://www.hermes.net.au/bayling/repair.html
Some of the single-coated Zuikos had a golden look to the coating.
My 24/2 is elsewhere but I'll go check later - but it was one of the
pro-grade lenses that was always multi-coated in some form as far as
I remember.
Andrew Fildes
afildes@xxxxxxxxxxxxx
On 02/10/2008, at 12:07 AM, Dawid Loubser wrote:
> By they way, a number of older Pentax and Canon lenses also suffer
> from yellowing due to "radioactive" thorium glass, cured through
> intense
> sunlight exposure for a couple of days.
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