Hi C.H.
You write:
<< But you must check and make sure the lens element does not turn
yellow, >>
And here I always thought that was due solely to the color of the
coating. Another possibility is that it uses a rare earth element,
which have a tendency to discolor with age. I'll have to check one out
under a Geiger counter next time I have one.
Gary Reese
Las Vegas, NV
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