Re: Re: Math and the pinhole camera

Colin writes:
"All you really need to know is what is
typically good exposure in about six different
situations"

This is very good advice!

Here is a simple approach for paper negatives. (I got the idea from those
easy exposure instructions that are printed inside 35mm film boxes.)

1. Find a good exposure for bright sun.
2. On a partly cloudy day: multiply the bright sun exposure by 2.
3. On a cloudy day: multiply the bright sun exposure by 4.
4. On a heavily overcast day AND in shade:
    multiply the bright sun exposure by 8.

I tried this with a few papers and it worked out prety well. It seems that
paper has a kind of built in consistency for this range of light. You'll
have to adjust a bit for light or dark subjects, though.

Cheers,
Jim K
Received on Fri Jan 12 09:35:57 2001