Building a pinhole camera, cont'd.
3. Paint the inside of the box black.
You do this to avoid having light reflected from the walls of the camera during exposures.
I needed an extra piece of cardboard to cover the hole in the box front. I paint this piece black also.
Done!
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4. Time to make the pinhole itself. Sand off all print paint and polish from the metal to make it as thin as possible.
Use very fine emery paper.
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