Re: front and rear pinholes.

----- Original Message -----
From: "Uptown Gallery" <murray@uptowngallery.org>

> Sometimes I wonder why I don't think before I ask some questions.

Basic answers to most of the pinhole behavior is given by simple geometrics,
so getting a piece of paper and making a drawing is a good place to start
for basic answers, in your case, making a drawing of 2 pinholes planes and
the film plane and connecting the edges of the pinholes with extended lines
until they touch the film plane would give you an idea of what it would
happen. As you now know, the more separation between pinholes planes, the
narrower the "geometric cone" of light. The actual "usable cone" of light
is even narrower because the virtual tunnel effect Nick talked about causes
very fast light fall off on top of the usual light fall off. So geometrics
give you the basic answer, the non-so-basic answer dealing with diffraction,
mentioned by George L Smyth, that's something else.

Guillermo

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Received on Fri Apr 23 09:20:47 2004