(easy, high cost, potential to give the "sharpest" image)
Materials: purchased pinhole (see suppliers section), brass shim material, opaque tape, Sharpie pen
1) Make a hole in the brass larger than the pinhole and smaller than the material the pinhole is on.
2) Blacken the brass with the sharpie pen.
3)Tape the pinhole to the brass and tape the brass to the camera
4) Calculate the f-stop and use the camera [f-stop = distance to the film divided by the diameter of the pinhole]
As with medium tech, the Selenium or Polytoner method may be used to darken a copper/brass aperatures/holes to be less reflective.