I never heard of anyone using a slide projector to find the optimal pinhole
aperture. Somebody else out there might have heard about it.
There are many formulas that various pinhole photographers have used. Many
have their own personal formula.
I found a formula in a Kodak publication. It seems to give me the most
optimal pinhole. And I have experimented with different diameters. Here is
the formula I use.
The Square root of the Focal Length times 0.007 equals diameter in inches
Look in the book, Pinhole Photography, Rediscovering a Historic Technique by
Eric Renner which is in its 2nd edition. This book will show you many
formulas. I'm sure people in this list have their own formula.
Eric Renner also publishes the Pinhole Journal, and is owner of Pinhole
Resource, a non-profit organization. The address for the Pinhole Resource is:
Pinhole Resource
Star Route 15, Box 1355
San Lorenzo, NM 88041
USA
Some pinhole photographers do not want the most optimal aperture. They
prefer a softer or blurred image.
Lonnie
Received on Sun Apr 8 00:24:32 2001
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