Making Your Camera
Now, it’s time to make your project. First of all, cut off one side of the can. For example, if it’s a standard tin can, then just remove the rest of the metal that you cut open with your can opener. You can use a utility knife or thick shears to cut off metal from a soda can.
Wear gloves while doing this step. You don’t want to cut yourself with either the metal or the cutters.
Next, thoroughly clean the inside of the can. Consider using some type of sterilizing material like vinegar or rubbing alcohol. This will keep any bacteria from growing inside your camera obscura.
Now, make a small hole on the opposite side of the cut that you just made. For now, make the hole very small. If your images are not very clear at first, then you can always make the hole slightly bigger.
Cut a piece of aluminum foil that is just slightly larger than the small hole that you just cut. The aluminum foil needs to be very tight against the hole, and try not to have any wrinkles. If you have wrinkles, then your image will be distorted. Secure the aluminum foil in place with a small piece of tape. If you want, you can cover the entire can with the aluminum foil.
Next, take a piece of tissue paper and secure it over the open end of the can, and tape it in place.