I'll go with that. In my own pinhole creations I strive for a clean, round, and very thin pinhole. This has improved my images. I've attempted this with aluminum foil, but ultimately I end up using thin sheet brass. I found that examination under a microscope is necessary to insure there are no entry or exit burrs, and that the pinhole is as clean and round as possible. Black seems to be the color of choice. I have read that blackening the hole with soot from a candle can help absorb light energy that would otherwise be reflected off the inside surfaces of the hole. For my own purposes I've blackened the hole's inside surfaces with black ink. I have included a basic diagram of a pinhole of my own design that has worked quite well so far. If anyone can use this or improve upon it, please feel free to do so.
Originally Posted by Nick Kanellos