A pinhole camera is a simple device that can be made from virtually any common closed chamber and is a great way to learn about the basic principles of photography. [amuu] Has created a version that can be easily made from concrete, with all the materials!
The build begins by making a mold for the concrete using foam laminated sheets. The foam is assembled with a ballpoint pen cut-up piece that acts as the core of the mold. This provides a place for the film winder in the final product. The concrete is then mixed and poured into the mold, and allowed to set. The key is to tap or vibrate to remove all air bubbles from the mixture.
Once set, the foam is mechanically removed from the concrete and the camera can be removed. The interior is painted black to enhance the light-tightness of the camera. Shutters, pinholes and a film winder are also fitted to allow the camera to work.
[amuu]The first attempt at taking pictures with the camera led to some results which were pleasantly low-fi. The film and some other works of art have overscan problems, but overall, the results are mysterious and fun. If you are not a fan of concrete cameras, you can always consider creating a 3D-printed pinhole camera instead!