RE: Travel kit for camera obscura experiments

Calculated with the aid of David Balihar's Pinhole Designer
(http://www.pinhole.cz/):

approx. Focal length (m) / (ft) | approx. optimum pinhole size (for
550nm green light):

2.0m / 6' 6" | 2.00mm
2.5m / 8' 2" | 2.23mm
3.0m / 9' 10" | 2.44mm
3.5m / 11' 6" | 2.64mm
4.0m / 13' 1" | 2.82mm
4.5m / 14' 9" | 3.00mm
5.0m / 16' 5" | 3.15mm
5.5m / 18' | 3.30mm
6.0m / 19' 8" | 3.45mm

Hope this helps,
Loris.

-----Original Message-----
From: owner-pinhole-discussion@spitbite.org
[mailto:owner-pinhole-discussion@spitbite.org] On Behalf Of Ed Nazarko
Sent: Wednesday, September 05, 2007 2:49 AM
To: pinhole-discussion@spitbite.org
Subject: [pinhole-discussion] Travel kit for camera obscura experiments

...

I'm terrified that a few of you will generate some elaborately precise
equations that will shame me (I do large economic models by day, but
still struggle with pinhole math, go figure.) Since I have three to
four evenings and mornings a week in hotel rooms I can afford to
experiment a bit. A few "try this diameter" messages will help me more
than formulae - other than my main life, I'm fairly math-phobic.
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Received on Wed Sep 5 00:19:48 2007