From: Les Newcomer (lnphoto@ismi.net)
Date: 04/25/00-02:27:25 PM Z
Judy Seigel wrote:
> On Tue, 25 Apr 2000, Les Newcomer wrote:
>
> > The there's the variablity of the sun itself. Montana sun in June is different
> > from Montana sun in December which is still different than the sun that hits
> > the ground in LA. any time of the year. So anybody's empirical tests will only
> > be good for the surrounding area, will it not?
> >
>
> Give that man the silver dollar ! Not only season of the year, but part
> of the country, and cloud cover for that particular day -- and did I
> mention hour of day? When the sun is relatively low in the sky the light
> is filtered through much more miasma, which, depending on the pollutants
> of your choice, filter out .... whatever they choose...
>
<snip>
After re reading this it occured to me that people were saying the same thing about
exposing dry plates around 1900-1910. A lot of 'exposure tables' were published at
that time varying by the month time of day, lattitude, etc, but rarely cloud cover!
I guess my point is eventually we worked this out and (maybe with that suntan/UV
meter!) a usable test could be done. BTW does this mean I could use Coppertone SPF
6 to dodge the shadows? ;-}
Les
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