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RE: filmscanners: Re: looking at the Sun

> Most glasses absorb UV much more strongly than IR. Most of
> the materials used for sun viewing and photography (eclipse
> goggles) have a  (log10) density of 5-8 for UV and visible,
> and less than 5 for IR.
> The worst of the lot is fogged colour negative film, which
> is fine in the UV & visible, but lethal to eyes because it's
> transparent to IR.

This is why ICE works with color negatives.  They are semi-transparent to IR
but the scratches and dust are not.  The same reasoning and warning should
apply to color slides (but not Kodachromes).


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