----- Original Message -----
From: "Philip willarney" <pwillarney@yahoo.com>
snip
>the focal length is about 40 mm, and I
> haven't figured out an exact f-stop for the pinholes
> yet).
>
> Use ASA 100 film
> Bright sun: 2-4 seconds
Philip,
Usually it is the other way around, you figure out the times based on your
aperture, and you find the aperture either by: 1-shooting and taking notes
until you "know" your camera and based on that find the aperture, or 2-by
measuring the pinhole diameter
http://members.rogers.com/penate/diameter.htm
In any case, based on your Bright sun exposure of 2 - 4 secs, the camera(s)
should have an aperture of around f/180, that, in turn, dictates a pinhole
size very close to the so called "optimum size".
If I were you, I'd measure the pinholes, find the f/stop and then come up
with the exposure table. I find that the easiest way to maintain or creating
enthusiasm for something is by having success from the start and a good
exposures table is surely a way to help your relatives to succeed from the
beginning.
Guillermo
Received on Tue Dec 3 10:12:42 2002
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