What's a camera like?

Virtual image is a collection of intersection points of light emitted by an object point after refraction by a lens, and its reflection line is a relative extension line. Virtual image is a physical vocabulary, which can't be reached by actual light, so it can't be accepted by light screen and can only be observed by optical elements. When people look at the 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 have begun to use the principle of "pinhole imaging" to manufacture various optical imaging devices, which are called "black box". /kloc-In the first half of 0/9th century, people finally found the method and medium to store the optical image on the projection plane in the black box, and the camera industry started from this, so the black box is considered as the ancestor of the camera. And "Camera" became the English name of the camera.

The invention of the camera

1839, French painter Daguerre invented the world's first camera according to the pinhole imaging principle, which was called "the diorama". However, the camera at that time was unimaginable to modern people. The camera box is as big as a small house, and the shooting time is at least 30 minutes, so that the subject's head has to be fixed in a pre-made clip, and all he gets is a heavy bronze plate.

At that time, a newspaper reporter commented: "It's like holding a mirror on the road, reflecting the surrounding scenery in great detail, and then taking the mirror home." ?

184 1 year, British scientist and chemist Talbot invented the negative film technology. Instead of "printing the image on a thick copper plate and taking it home", the image is printed on low-cost paper through the negative, which greatly reduces the cost and leads to the emergence of commercial cameras for ordinary people to take pictures. Although it was still rough and crude at that time, it already had the basic performance of modern cameras. Since then, photography technology has been widely spread all over the world, and photographic equipment has been continuously improved.

After 170 years of historical evolution, the camera has gradually developed from a huge "peep show" to a small and exquisite precision instrument with simple operation and excellent performance, and has begun to develop towards full automation, multi-function and high definition.