> I remember reading articles in Leica
> Fotographie
> discussing the color effect of the cements gluing some of the lens
> elements together. Then different kinds of glass, number of elements
> and coatings each have their effects. In those instances certain
> portions of the spectrum are being absorbed so that other
> parts appear
> to be enhanced. It seems to me though that no part of the spectral
> saturation is increased, just the opposite parts are
> decreased and our
> brain sees the warmth or coolness.
Exactly, as for coatings think about this: take a look at the reflections
from your Zuiko MC 50mm f1.8 (s/n 26647xx), to my eye there are strong green
reflections and less strong magenta reflections. The fact that you see the
reflections as different colours means that those colours aren't being
transmitted as strongly through the lens to the "sensor", so the colour
balance of that lens will be different to an early SC version with amber and
mauve reflections. The difference will be measurable with the right
instruments but may or may not be significant to you as an image maker.
...Wayne
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