"A hole smaller than a sewing needle and a tin can. That is a camera.
"KaiRenner26th of April 2026
How a Pinhole Camera Works
A pinhole camera uses a tiny aperture — a clean hole in metal foil or a thin sheet — instead of a lens. Light from the scene passes through the pinhole and projects an inverted image onto photosensitive material inside the camera. The smaller and cleaner the pinhole, the sharper the image. Photographic paper (not film) is the easiest light-sensitive material to use — it is handled under red safelight and developed in standard darkroom chemistry.
0.3to 0.5mm
f/200to f/300
Prepare the Camera Body
Paint the inside of the tin flat black and cut a hole for the pinhole.
Prepare the Camera Body
Use any light-tight tin can — an oatmeal canister, cookie tin, or paint can. Paint the inside matte black to prevent internal reflections. Cut a 1cm square hole in the center of the front face. The lid must seal completely without light leaks — seal any gaps with black gaffer tape.
Make the Pinhole
Pierce a thin piece of aluminum foil or a drink can panel with a fine needle.
Make the Pinhole
Cut a 2cm square of aluminum from a beverage can — it is thinner and more consistent than foil. Sand one side lightly with 400-grit sandpaper to thin it. Pierce with the tip of a sewing needle using a single smooth rotation — do not stab. View against a bright light: the hole should be a clean, round point with no tears. Tape the pinhole panel over the interior of the 1cm hole, pinhole centered.
Load Photographic Paper in the Dark
Cut paper to fit the back of the can and attach with a small piece of tape.
Load Photographic Paper in the Dark
Under red safelight or in complete darkness, cut a piece of grade 2 or 3 RC photographic paper to fit the inside back of the can. Tape it emulsion-side facing the pinhole. Close the lid and seal the seam with black gaffer tape. The camera is now loaded and light-sensitive.
Expose and Develop
Expose in bright sunlight, develop in paper developer, stop, and fix.
Expose and Develop
In bright sunlight an f/250 pinhole camera requires roughly 1 to 4 minutes of exposure. Place the camera on a stable surface, uncover the pinhole (a piece of black tape makes a simple shutter), time the exposure, and cover again. Develop the paper in a safelight environment: 60 to 90 seconds in paper developer, 30 seconds stop bath, 2 to 4 minutes in fixer, then wash in running water for 5 minutes.
What You Need
Light-tight tin can or container
Matte black spray paint for interior
Aluminum beverage can for pinhole material
Fine sewing needle for piercing
Grade 2 or 3 RC photographic paper (5x7 cut down)
Paper developer, stop bath, fixer
Red safelight
Black gaffer tape
A Negative Becomes a Positive Your developed paper is a paper negative — tones are reversed. To make a positive print, contact print the paper negative onto a fresh sheet of paper under a sheet of glass in white light, then develop normally. This second generation print shows the scene with correct tones. Alternatively, scan and invert digitally.
"Every photograph ever made started with light through a hole. Your version is just more honest about it.
"KaiRenner26th of April 2026