How To Make A Pin Hole

Materials needed:
0.002 gauge brass (get at the Hardware Store)(BR)
#8, #12 and possibly a #13 needle (get at local Sewing Shop)
600 grit emery paper

Directions:
Cut out a one inch square of the brass and place on a piece of cardboard.
Place the eye of the needle in the  end of a pencil eraser.
Using the pencil as a drill, spin the pencil while applying a little pressure 
until the needle comes thru the metal about 1/8 inch.
With the 600 grit emery paper, sand the metal burr on the back side of the 
metal.  Also sand the front side to make the pin hole quite thin.

HINTS:
For a pint paint can the focal length is about 100 mm and the optium pin 
hole is .0146 inch.  A # 12 needle is needed to do this. If you can't find a 
#12 needle use a #13.
For an old Kodak folder the focal length will probably be 105 mm and will 
require a #12 needle.  If you have a 2 1/4 square camera, the focal length 
will probably be 75 or 80 mm and will require a #13 needle.
For a large computer paper box camera, a focal lenght of 254 mm is what I used
and required a #8 needle.  Also for the large camera, I had to build a slot to 
hold the film.  
I used either regular photo paper or ortho lith film developed with Dektol. 
The f/stop for the three pin holes described above are:
Paint can and Kodad Roll Film Camera---f/256
Computer paper  camera------------------f/436
I used several methods for determining exposure but some 
use the trial and error method using the Sunny f/16 rule as 
a starting place.

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