Building a pinhole camera

<p>I have been writing a guide building pinhole cameras on my website. I hope this is of some interest or help. <br>

If any of my figures seem crooked I'd appreciate a pointer also willing to take any questions or suggestions.<br>

Cheers<br>

Chris</p>

<p>http://papercamera.co.uk/what-size-should-a-pinhole-be/</p>

<p>To be consistent with the other pinhole diameters in your information, the diameter for a 135mm focal length in the 35mm chart should be about .5mm, not your .39mm.<br>

There may be little need to include the image circle data. Some pinhole photographers are content with greater image circles than listed.</p>

<p>Thanks Jim. You are quite right. Fat fingers on my part. <br>

I take the point on the image circle data. It might not be useful to everyone. I have included it as the vignette effect can desirable.<br>

Have I left anything out that might be useful.<br>

Obliged<br>

Chris</p>

Soda cans are a good material to put the pinhole in. Kitchen foil is terrible. Shouldn't the distance

from the film/paper be the dominant factor in the "focal length" of a pinhole? So a pinhole at

125mm from the film is literally a125mm lens? Then the pinhole is just the absolute aperture and

you divide the focal length by the pinhole diameter to get the f/.

<p>The tradition is to choose the pinhole diameter as the optimal minimum considering diffraction. Depending on how you determine the size of the diffraction pattern, you get a slightly different size for the pinhole.</p>

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