Quote Originally Posted by youwattom View Post
what tool do you measure the pinhole diameter with?
the gap between the pinhole and the film is?
could you use colour filters with a pinhole?
I struggle to understand f/stops any simple description?
Sorry for my simpleness.
1.23mm= 1.23mm or 1.23cm?!
I have this to offer:


If you have an enlarger (or slide projector), put your pinhole and a piece of paper of known length into the negative holder, rack it up, focus and measure the size of both. The piece of paper will tell you about the magnification,and the measured pinhole diameter divided by it will tell you its size.