Material preparation: a packing box, a roll of adhesive tape, some waste foam core boards, a roll of transparent adhesive tape or wrapping adhesive tape, an aluminum beverage can, a ruler, scissors, a sharp knife, a pen or pencil, a piece of fine sandpaper or steel velvet, etc.
1. Stick all the edges of the box with black tape to ensure that light cannot enter the inside of the box. Cut three pieces on the front and side of the box, leaving a small gap for the lid.
2. Place a pinhole in the center or other position of the packaging box. Stick a square piece of scotch tape on the trademark with scotch tape, and then cut off the triangle where the pinhole is located to prevent light leakage.
3. Use a small aluminum beverage can and stick it in with a needle.
5. Smooth the convex edge on the back of the pinhole with fine sandpaper or steel velvet to ensure that the pinhole diameter is about 0.298 mm ..
6. Measure the depth of the packaging box, about 45mm from the pinhole to the paper. Using the measured value and the pinhole of 0.298mm, it can be determined that the aperture value produced during exposure is F 15 1.
7. In this way, a simple pinhole camera is completed.