Re: keeping notes; photographing at dusk

Hi:

I've run into a few of those situations as well, where the light is
failing and it will be dark before the picture is done.

You could try intensifing the image. I could look up info on
intensifiers.

The instrument you want is called an integrator, although they are usually
used with a graphic arts UV printer to measure the total exposure of UV.
Often UV light souces have uneven output over time.

I don't know if there is such a thing for daylight. I'll check some
instrument catalogs

Gord

On Thu, 27 Jun 2002, Shannon Stoney wrote:

> One problem I ran into yesterday: I started an exposure around 6:30 pm and
> according to my calculations it was to be 20 minutes. When I came back 20
> minutes later, the scene had changed a lot. I metered again and it was two
> stops darker in the shadows! So I figured a new time for that amount of
> light and averaged the two, which turned out to be 80 minutes. Went away
> and of course it got darker some more while I was gone. It was plumb thick
> dark when I came back. I developed that film tonight and sure enough, it
> was underexposed.
>
> I guess you could say the moral of the story is, don't try to make a picture
> when it's getting dark. But, that's when the wind dies down and leaves stop
> moving around. It would be nice if there was a way to figure exposure when
> the light is constantly changing.
>
>
> --shannon
>
>
> >
> >
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---------------------------------------------------------
Gordon J. Holtslander Dept. of Biology
holtsg@duke.usask.ca 112 Science Place
http://duke.usask.ca/~holtsg University of Saskatchewan
Tel (306) 966-4433 Saskatoon, Saskatchewan
Fax (306) 966-4461 Canada S7N 5E2
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Received on Fri Jun 28 02:20:12 2002