If you already own an interchangeable lens camera, you can make a pinhole lens in five minutes.
How a Pinhole Camera Works
Light is reflecting off of every object around us. Our eyes focus these light rays so that we can see the details of where this light is reflecting from. Similarly, a camera lens focuses these light rays onto a flat sensor or piece of film. Without lenses, the light reflecting off objects would hit the camera’s sensor from every direction, causing the sensor to record brightness but no shape or detail.
By allowing light to hit a flat sensor from a single pinhole, you are forcing all the light to hit the sensor from one single point, perpendicular to the image plane, creating a somewhat focused image.
In theory, the smaller the hole, the sharper the image, but at a certain point, diffraction will become an issue, and a smaller hole will create a softer image. Learn more about the math behind choosing your pinhole size here.
How To Make a Pinhole Lens
You can purchase pinhole lenses, but before you do, you should try to buy your own.
Step 1. Drill a hole in the center of your camera’s body cap.
Step 2. Tape a single piece of aluminum foil over the hole
Step 3. With a pin or needle, poke a small hole in the center of the foil.
Check out the video above to see it in action.