Pin hole cameras need a F - stop and this is why we use them.
We use the combination of F - stop (f - 90) film speed(6ASA) to calibrate the shutter speed exposure time. (Seconds/Minutes)
The calculation to work out the F stop is
F = Stop = 72
----
0.8
F - Stop = f - 90
These are the negitive photos
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These are the positive photos
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