Capturing light with a hole: the 2,500-year-old art of pinhole photography
In short: Before complex lenses and digital sensors, humans mastered the physics of light using nothing more than a box and a tiny puncture. By understanding how light travels in straight lines, you can build a functional camera from household items like an oatmeal container and aluminum foil.
The pinhole camera is one of the simplest optical devices ever invented, relying on the fundamental principle that light travels in straight lines. When light passes through a small aperture, it projects an inverted image onto a surface behind it. Rather than being a recent creation, pinhole cameras were documented by Chinese people during 500 B.C., establishing them as a fundamental piece of ancient optical engineering.
To construct a functional model, the primary goal is lightproofing. Using an oatmeal box as a base, the interior must be completely sealed from external light—often achieved by gluing the bottom lid shut and spray-painting the entire interior black. A small door is cut into the side to act as the viewing port. The 'lens' is replaced by a pinhole plate made of heavy aluminum foil or a soda can. A tiny hole is poked into this plate using a No. 16 needle, then sanded on both sides to remove burrs and ensure a clean path for photons.
The chemistry of the image is handled by photo emulsion paper. To capture a shot, the paper must be placed inside the box in a completely dark room, with the emulsion side facing the pinhole. Because there is no lens to gather light, exposure times are significantly longer than with modern cameras; a typical scene might require a 20-second exposure. Once the image is captured, the paper must be returned to a lightproof bag and taken to a darkroom or a professional shop for chemical development.
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- Summary by Intellect · source: How to Make a Pinhole Camera
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