Notice the shutter handle sticking out from where the pinhole is located beneath the mark on the shutter guide. This completes building the pinhole camera. Now it is time to set up a darkroom. Pinhole cameras must be loaded with film in a darkroom, and the pictures taken with them can only be developed in a darkroom. Also, be sure to remember to strap on the lid with a pair of rubber bands before going outside into the bright sun.
Most light leaks come from the camera lid.