Moose said:
... Some of the earliest 50/1.4 and 55/1.2 lenses (but no 50/1.8s, I
believe) had one or more lens elements using glass with a bit
of a radioactive rare-earth element... A byproduct of this,... was that
the glass acquired a yellowish cast over time as a byproduct of the
radioactive decay. Some other manufacturers had the same problem.
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Yes, other manufacturers had the same problem. Fortunately, Brian
Ayling of Oz and owner of a yellowing screw mount Pentax Takumar has
devised a universal fix for the problem. See his repair page at:
<http://www.hermes.net.au/bayling/repair.html>
Chuck Norcutt
Woburn, Massachusetts, USA
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