RE: lights

KOUKLIS, KERIK T (Kerik.Kouklis@Aerojet.com)
Thu, 14 May 1998 13:24:09 -0700

> If the short-length UV (200-300nm) is
> selectively absorbed by the clouds, but longer-wave (in the 350-500 nm
> range, where ferric compounds are most 'absorptive'), this would
> explain
> why the image is still formed, though the intensity of the light is
> diminished. I have no idea why the contrast is different, perhaps
> one
> of the expers on the list will explain.
>
I have always attibuted this to reciprocity effect. The same way
contrast builds up in film with long exposures.

Kerik
http://www.jps.net/kerik/