"Depending on the spectral frequency, the penetration of UV through the
glass is an issue. Does the needed frequency reach the affected element?
Suspect that the only realistic path is to remove the yellowed element for
direct exposure. Whether your source produces the resonant frequency UV
needed is an unknown. The one thing about sunlight is the complete spectrum.
Also suggest serial test photos with adjacent color cards."
Let's untangle this.
The UV source in question is a short-wave mercury-vapor lamp. It produces
wavelengths that DO NOT generally reach the surface of the Earth.
Without going into quantum mechanics, you don't need a "resonant"
frequency -- simply a photon with at least enough energy to break the bond.
So short-wave UV should be at least as effective as the longer-wave UV in
sunlight that actually reaches us.
Which leaves two questions. Is the coloration caused by a compound that can
be broken down into colorless substances by the application of UV? And if
so, will the UV actually get through the glass to work its magic? Either
way, I'm not about to dismantle the lens to find out.
There's no need to test the lens by taking photos, as the coloration is
plainly visible by holding the 55/1.2 and any other Zuiko above a sheet of
white paper in sunlight. The coloration is also visible through the finder.
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