Sharpness and wavelength

[Ole]

If you tend toward building alot of cameras of the same f.l. or want to share them in a group buy, look up emdiasum, a supplier of electron microscopy materials...

That's www.emsdiasum.com

[Rich Ullsmith]

Going there now. Thanks.

[panastasia]

.. When drilling, back up the .001 metal with something much thicker of brass or aluminum, this will help prevent the metal from distorting due to the pressure of drilling.

How about making a tight sandwich with the thick stock above and below the thin stock to minimize burrs when drilling?

I'm not a pinhole photographer but became interested in making one after seeing the work of Barbara Ess in here book I Am Not This Body. The unsharp images were the best, IMO, very surreal and interesting compositions.

[Jim Jones]

How about making a tight sandwich with the thick stock above and below the thin stock to minimize burrs when drilling?

With very thin (like .001") that certainly helps. I also debur pinholes with a needle with the tip honed to a broad three-sided pyramid.