What does the camera look like?

The camera creates a virtual image.

The virtual image is a collection of intersection points of the light rays emitted from the object point, refracted by the lens, and the reverse extension lines of their reflection lines. A virtual image is a physical word that cannot be reached by actual light. Therefore, it cannot be taken over by a light screen and can only be observed through optical elements. When a person looks at a virtual image, light still enters the human eye, but the light does not come from the virtual image, but is reflected or refracted by the optical element.

Before the invention of the camera, people had already begun to use the principle of "pinhole imaging" to manufacture various optical imaging devices. This device is called "Camera obscura". In the first half of the 19th century, people finally found a method and medium for fixing and preserving optical images on the projection surface in a camera obscura. This was the beginning of the camera industry. Therefore, Camera obscura is considered the ancestor of the camera; and "Camera" became the English word for camera. name.

The invention of the camera

In 1839, the French painter Daguerre invented the world's first camera, known as the "zoetrope" based on the principle of small hole imaging. However, the cameras at that time were beyond the imagination of modern people. The camera obscura was as big as a small house, and the shooting time was at least thirty minutes, so that the head of the person being photographed had to be fixed in a prefabricated clamp, and all that was obtained was A heavy copper plate.

A newspaper reporter commented at the time: "It's like holding a mirror on the road, the surrounding scenery is reflected in extremely fine detail, and then taking the mirror home."?

1841 Talbot, a British scientist and chemist, invented the negative film technology in 1988. Instead of "printing the image on a heavy copper plate and taking it home", the image was printed on the cheap paper through the negative, which greatly reduced the cost and appeared. A commercial camera that can be used by ordinary people to take photos. Although it was still relatively crude and crude at the time, it already had the basic capabilities of a modern camera. Since then, photography technology has spread widely around the world, and photography equipment has been continuously improved.

After more than 170 years of historical evolution, cameras have gradually developed from bulky "dioramas" into small, exquisite, easy-to-operate, and high-performance precision instruments. They have also begun to develop into fully automatic, multi-functional, and The trend of high definition is developing.