DWT - yes I was using Mr. Pinhole as the calculator. I'm not really opposed to falloff thogh. I mean, I'm using paper negatives in a pinhole. I'm not going to get a tack sharp image anyways. Thats what the RB67 is for!

Ned - I tend to over think things too, especially in the conceptual phase (hence the size of this thread, and no pinhole built yet).

I might just go with DWThomas's numbers and go from there. Just 2 more questions though.

1- If I'm shooting for a .30mm pinhole, what is the best method, and how should I (somewhat) accurately measure?
2- what is the f/22 exposure multiplier?