GoForSmoke:
Colray and Chris, I don't have time into pinhole cameras that either of you do.If the thickness of the material that the pinhole is in matters, have you tried depositing flame soot on a glass slide and making the hole in that? My physics teacher used the soot on a slide trick to make double-slits for the lab groups, but maybe that was only to make scoring the slits easy?
Hey GFS, I make my pinholes by tapping a tack on copper foil, then sanding off the peak to form a nice round hole with a knife edge, so there will be no shadowing effect. I use them for photography of course, but also as a way to clean up a laser beam.