Hi Gary
I just want to be sure I'm calculating this correctly .
I am building a pinhole with a focal length of about 65mm...
based on the formula below for metric,
that's a pinhole of 0.3mm ... is this correct?
i.e 0.03679 * sq.root of 65
Sorry if I don't quite understand what "SQR" means.
----- Original Message -----
From: "R. Gary Hall" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, September 18, 2001 1:19 PM
Subject: RE: [Cameramakers] pinhole camera
> Pinhole diameter in inches = 0.0073 * SQR (focal length in inches).
> Or metric Pinhole diameter = 0.03679 * SQR (focal length in mm).
>
> Robert G. Hall
> Robert Hall Photography
> http://www.RobertHallPhotography.com
> [EMAIL PROTECTED]
> 801-673-4510
>
> >
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