# Pinhole Design Graphs

These instructions have been taken from the Exposure mapping thread. They have been written by "Polka". Graphs implemented by "durian".

## Tools for classic flat plane pinhole cameras

The first tool draws light fall-off in EV at x in mm, away from the centre of the picture , where you may adjust with three sliders

**f** the distance of the pinhole to the centre of the film plane
**d** the diameter of the pinhole
**e** the thickness of the pinhole plate

The second tool draws four curves for blurring in mm, with two causes (geometric (confusion circles), and diffractive circles) in two directions (radial (away from the center), and tangential, (perpendicular to the former)), where you may adjust with four sliders

**w** the wavelength
**f** the distance of the pinhole to the centre of the film plane
**d** the diameter of the pinhole
**e** the thickness of the pinhole plate

## Tools for anamorphic cameras

The third tool draws light fall-off in EV at x in mm along a generatrix of the film forming cylinder, away from the pinhole plane. The following three variables may be adjusted.

**f** the radius of the film forming cylinder
**d** the diameter of the pinhole
**e** the thickness of the pinhole plate

The light fall-off is given with reference to the the hypothetical f/stop at the center of a flat plane cam with same f and same d. The maximum of this curve is at about -1.5EV under this!

Finally, this tool draws four curves for blurring in mm at x in mm (same as in the third tool), with the same two causes as in the second tool, but with slightly different meaning of radial => transversal (from edge to edge of the film) and tangential => longitudinal (along the film band). The following four variables can be changed.

**w** the wavelength
**f** the radius of the film forming cylinder
**d** the diameter of the pinhole
**e** the thickness of the pinhole plate

## Miscellaneous

Tool to determine the right pinhole size