Pinhole Daytime Exposure
Estimate daytime pinhole exposures from focal depth and hole size, with extra time when tiny apertures push film into reciprocity failure.
Frequently asked questions
How is f-number found?
Focal depth divided by hole diameter. A 80 mm can with a 0.4 mm hole is f/200.
Why extra time on paper?
Photographic paper and some films lose speed in very long exposures. This estimate adds a small reciprocity bump at high f-numbers.
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