[Phys-L] Re: pinhole camera

[Ludwik Kowalski <kowalskil@MAIL.MONTCLAIR.EDU>]

On Wednesday, Jun 1, 2005, at 12:46 America/New_York, Anthony Lapinski
wrote:

> Pinhole is on bottom of cannister, about 1 mm across. Eye is near this
> hole, looking through the cannister at text. Text is about 5-6 cm from
> eye.

It is much easier discuss the pinhole camera when the image is formed
on a screen (or film) in air. Retinal images are much harder to
analyze. The subjective angular magnification of a single pinhole (made
in a a piece of dark paper and kept as close to the iris as possible)
is about two or three. in my demos the examined objects were closer to
the pinhole than 5 cm. The magnification becomes larger when the
distance to the object becomes smaller. It takes a minute of two to
prepare the demo, if you have a pin or needle.

Ludwik Kowalski
Let the perfect not be the enemy of the good.
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