black paint and pinhole

I've been using standard brass shim for pinholes without painting the
inside black. I've just read one report that reccomends that you do
so. What do other people think? Plus would like to hear from anyone
using slit apertures, I'd like to have a go but I'm not sure how to make
one, size, materials, exposures etc. Any suggestions?
Received on Thu Nov 9 08:18:27 2000