What is the "black box" in the camera?

If the light reflected from a bright scene enters a dark room through a small hole, a dim scene image can be formed on the wall opposite the scene. This image is upside down, because the light from the upper part of the object can only shine on the lower part of the wall, and the light from the lower part can only shine on the upper part of the wall. This is the well-known principle of black box. However, as early as 1593, Bella Baltar, a painter from Naples, used this phenomenon to copy prints. Baltar set up a visor in a room with poor light. A small hole called "pinhole" was drilled on the board, and the light-facing side of the board was facing the picture to be copied, so that the small hole was aimed at the picture. The light shines on a piece of white paper in the room through a small hole, reflecting the image of the published painting. At this time, the painter can trace the outline of the published painting on the paper. Later, people transformed the darkroom, simplified it into a black box, and replaced the pinhole with a magnifying glass or telescope to make the image clearer. A tilted mirror is installed in the black box to reflect the image onto a horizontal glass at the top of the box, on which a translucent drawing paper is placed. The black box is an auxiliary tool for painters to draw. /kloc-in the 0/8th century, black boxes were very popular, and various black boxes came into being, including desktop, sedan chair and folding. The big one can be carried by two people and the small one can be put in the palm of your hand. The invention of black box laid a certain foundation for the appearance of camera.

For centuries, black boxes have been daunting and occupied people's imagination. Today, with the help of high-tech special effects, black boxes can create incredible images, which are used by astronomers, artists, cinematographers, inventors and magicians all over the world.