BOXES IN WOOD
Specifications

Pinholes used in these cameras are manufactured from 0.025mm (0.001") stainless steel and accurately micro cobalt drilled. The resulting pinholes are very clean and circular. See microscopic photo below:

Pinhole sizes and focal lengths are calculated using Pinhole Designer based on the following formula:
d = c
f x l
Where:
d = pinhole diameter
c = constant (1.59)
f = focal length
l = light wave length (0.00055)
The constant (1.59) accords with the pinhole edun specification and cameras built on this formula produce clean clear sharper images. This constant gives a different result to the Lord Raleigh constant of 1.9.

The tables below detail the specifications used in the construction of 4x5 and 10x8 cameras: