Hi This is Lonnie: The focal lengths that you mentioned for your pinhole camera are of a very wide angle of view. Many pinhole photographers do use a wide angle view. I have a friend who is a professional advertising photographer who has a pinhole camera that is like a fisheye lens.
The normal focal length of a 4x5 camera would be 6.5" (6 1/2). This focal length would be similar to a 50mm lens on a 35mm camera. The 0.018" drill and drill bit I got from a large hobby shop that caters to railroad hobbiests. If you use a #10 sewing needle and put the end with the eye in a pencil erasor, you can use it as a drill, by turning and lightly pushing the needle through the thin sheet of brass. A #10 needle is 0.018" diameter. Remember I will give you a booklet I wrote on the pinhole camera since you are with the girl scouts. All you have to do is request it. If you have any more questions about photo labs, pinhole photography, or any other photographic questions just ask. PHOTO-ED Lonnie Paulson P.O. Box 80305 Minneapolis, MN 55408 612-827-1084 Lonnie
