I use brass foil 0.002" thick (stuff that auto mechanics use) and make
the holes with a pin or needle, it takes me about 2hrs to leave a more
or less decent hole. I was thinking in buying made for Holography
pinholes (from Edmund scientific for instance) they are expensive but
it seems to me they should be as perfect as it can gets. After reading
your comment on drilled holes being miniature tubes I now think
holography pinholes are not a good idea, as the laser beam is so
coherent that a drilled hole (tube like) won't cause any unwanted
effect, chances are those pinholes are drilled. Have any comment on
this?
-> Oh yes. It helps to darken the silver to diminish flare inside the hole
-> and from the surface of the silver. Selenium toner is what to use for
-> that. DON'T use PAINT! Toner leaves the hole clean and does not change
-> the dimension. Not so paint!
I first spray painted them, now I don't darken them and get better
results. Does selenium work on brass?
Thanks in advance,
G.Penate
* 1st 2.00b #2045 *