Dave Bell wrote: >One important consideration here is to make the pinhole in as thin as >possible a sheet of material. Foil stretched over a hoop would work well, >and be easy to punch. Pinhole camera buffs make a point (heh!) of drilling >a hole, using a sharp needle, with a backup block of plastic or the like, >to ensure a smooth, burr-free hole. Then polish both sides with very fine >emory cloth. For these shadow sharpeners, I doubt that's all necessary, >but a "flat" hole in thin stock would be best for you, too...
Perhaps the only way to get a truly 'burr-free' and 'surrounding depression free' hole is to chemically etch it. (Trust him to think of a difficult solution!!!) ;-) Tony Moss -
