What is a Pinhole Camera?

A pinhole camera, also called a camera dark box, is the prototype of the camera. The basic part includes a sealed black box, followed by a focusing screen. The front of the sealed box is a small hole or a condenser lens. You can see a clear image on the screen. If you mount a photosensitive film on the screen, you can also take a clear picture. This becomes a pinhole camera; however, this requires a "shutter" and a camera. Slots for negatives. In addition, the sealing is also more stringent than the requirements for making ordinary small hole imagers. ^[1]

Pinhole camera

The light emitted by the object passes through the small hole or lens,

Use a knife to lightly cut the piece of paper, do not cut through, so as to fold a straight edge when bending. Both sides of each piece were then painted black.

Bend the unfolded front view of the cut front cover by 90 ° along the dotted lines to form a five-sided carton and stick it with tape. Then attach a piece of 120-film black backing paper to the side with round holes, and use a needle to puncture a small hole in the backing paper with a diameter of about 0.4 mm (the diameter of the 12th needle is about 0.4 mm ). Then put a paper slot on the side of the small hole, and insert a hard paper strip in the paper slot, which can serve as a shutter and keep the small hole clean.

Bend the unfolded inner layer of the cut front cover by 90 ° along the dotted lines to make one

1. Pinhole camera

1. Be careful when making, there must be no light leakage.

2. The pinholes must be round and the edges must be smooth.

3 Due to the long exposure time, it is better to shoot still life.

Editor's note: This self-made teaching aid can be supplemented with physics experiment teaching in the "optical" part.