Instructables
video Build a pin-hole lens
build a pin-hole lens with a thin sheet of brass, suitable for digital SLR camera
Ranie-K1 year ago
To make a smaller pinhole than the needle itself, just dent the brass and polish the bump on the other side.

If you don't have brass, cut a piece of aluminum from a soda can.
giocad (author)  Ranie-K1 year ago
exact, even then I have done so ...
This video was the first pin-hole that was building.
thanks ...