I get a lot of empty boxes from people who know I make pinhole cameras. Lately there has been a bit of a backlog. One stood out head and shoulder above the rest. A Paperchase Kraft gift box 190x190x110mm. Strong, sturdy and just the right size to take a 4×5 dark slide.
What you will need. A pen, knife, ruler, 4×5 dark slide and of course a box.
Measure the width of the dark slide
Mark the width of the dark slide on the box
Mark a line to be removed to accept the dark slide
Remove the section where the dark slide will be inserted
By removing a section from two ends the dark slide can be inserted and removed to expose the film
Bore a hole in the centre of the box. You can use a drill although this scalpel work just as well
To calculate the focal length and diameter of pinhole required, measure the distance from the film to the inside face of the box. Use the PaperCamera charts a to calculate the pinhole diameter, f-number and recommended exposures