Others who are more mathematical than I can give you better help, no doubt. 
But check this website to see if it can help...

http://home.netcom.com/~lfratkin/calcindx.html

Good Luck!
Benno Jones

----------------------------
See my homepage at http://www.jps.net/benshan




>Ok, 
>I have been doing a bit of reading but I am a bit
>confused.  Being that this is my first pinhole camera 
>I am a newbie.  I figured out my pinhole diameter to
>be 0.22 for a 1.5in focal length and an F-stop of 167.
> Is this right?  I just don't want to screw it up and
>was hoping someone on the list could maybe check my
>math so to speak.  I just have a funny feeling that
>this is not correct.
>
>Thanks,
>
>Tom
>
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