Humans use their eyes to perceive the colorful world, while cameras use lenses to capture beautiful scenery.
The objectively existing scene is actually a kind of optical information, which reflects light of different brightness and spectrum (that is, color). The camera is to preserve the light of a certain moment forever.
Traditional cameras convert these light rays into chemical changes on the film. These films are only semi-finished products and require further chemical reactions to develop. It can be seen that the shooting process of traditional cameras (film cameras) is entirely based on optical and chemical signals. Conversion process.
Regardless of the final storage medium of a digital camera, its essence is to convert a set of light with a certain brightness and spectrum into a bunch of binary numbers, and then save it on a certain recording medium, which belongs to the conversion of optical signals and electrical signals.
However, whether it is a digital camera or a traditional camera, the first thing that it receives is the optical information of the scene.
Therefore, the optical lens is an indispensable first component, and the subject must pass through the optical lens to be imaged onto the imaging device. Therefore, people often say that the lens is the camera's eye.
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