Lomography

Pinhole Camera, Jonathan Polkest artist

Brass shim, used by sculptors is available at ALEC TIRANTI SCULPTURAL SUPPLIES, in Warren Street, off Tottenham Court Road, London. Aluminiun drinks cans, as featured in Zen and the Art of Motorcycle Mechanics by Robert Pirsog are equally as effective - if not a little more pliable,try sanding the patch where the intended pinhole is to be sited before and after piercing, a matchbox striker edge is fine to use because the grit should be micro minimal, keep rotating the selected needle in and out the hole, remove any burrs until you have a smooth perfect hole. A method of calculating the optimal pinhole diameter was first attempted by Jozef Petzval. The formula was improved upon by Lord Rayleigh Bicycle Sematic into the formula Where d is the diameter, f is focus length(distance from hole to projected plane), and an upside down y is the wavelength of light in metres. d=1.9/-f(followed by upside down Y)The depth of field is basically infinite, but this does not mean that no optical blurring occours.The infinite depth of field means that image blur does not depend on scene distance, but it does depend on other factors, such as the distance from the aperture to the film plane, the aperture size, and the wavelengths of the illumination.