>
>next Q, what's the best way to punch a 0.3mm pinhole?
>

i recommend you "drill" the hole and not punch the hole.
take a large needle and spin it into the foil like it was a
small twist drill.  do this over some stiff cardboard.  be
prepared to drill several pieces of foil as it takes several
tries to get as perfect a pinhole as you can.

if you place your pinhole foils in your enlarger and project
them onto a piece of white paper you will see which hole
has the least amount of deformation.

peter

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