Re: pinhole size

Hello jean,

I do it this way, works fine:
I cut a stroke of paper, 10 mm wide, 3 or 4 cm long, and place it in a
transparancy slide frame.
In another slide frame I place the metal with the pinhole.
Put the first frame in a slide projector and enlarge it a lot, i.e. till the
10 mm stroke measures 200 mm: an enlargement of 20.
Measure the size of the pinhole at the same enlargement and you have a very
good idea of the size of the pinhole.

Good luck

Hennie Koenen

----- Original Message -----
From: "Jean Hanson" <jhanson@pon.net>
To: <pinhole-discussion@pinhole.com>
Sent: Monday, July 22, 2002 12:53 AM
Subject: [pinhole-discussion] pinhole size

> I have the math on how to figure the ideal size of the pinholes but how
> do you actually measure them. Does everyone but me have a microscope, a
> micrometer? what? Jean
>
>
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Received on Mon Jul 22 16:58:54 2002