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The Art of Pinhole Photography

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Before buying a pinhole, consider making your own. Its as easy as pricking a piece of foil with a needle - literally. An aluminum soda can be cut to make an adequate piece of foil, and a small sewing needle is all you need.

Just as with pinhole cameras, there are lots of detailed instructions on the internet on how to make a pinhole. The Pinhole FAQ has good instructions and is a good place to start.

Some people want the sharpest pinhole images they can make. I usually suggest buying a lens camera for this purpose. But, if you strive for that super sharp pinhole photo, here are some places you can buy perfect pinholes in measured sizes.
Information:

How To Determine Pinhole Size And Exposure (Guillermo Peñate)

Guillermo Peñate understands the science of pinhole photography better than anyone I know. This easy to follow article explains how you can determine the right size pinhole for your camera. Check out all of Guillermo's articles once you are there.

Pinhole Size Calculator (Larry Fratkin)

Larry Fratkin's site provides calculations for optimal pinhole size, exposures, and more.

How To Measure Pinholes With A Scanner (Guillermo Peñate)

Guillermo Peñate shows you how to use a scanner and Photoshop to measure the size of a pinhole you've made.
On-line Shopping:

Freestyle Photographic Supplies

Finney pinhole body caps for a variety of camera bodies. Snap one of these on your 35mm camera and have an instant pinhole camera.

Custom Made Zone Plates, Photo & Pinhole Sieves, and Pinholes (Guillermo Peñate)

A very reliable source for pre-manufacturered and custom made pinholes, zone plates, and sieves.

Lenox Lasers

Precise, laser-cut pinholes.