What is the shutter in shooting?

Shutter, whose English name is Shutter, is a device on camera to control the effective exposure time of photosensitive film.

At present, digital camera shutters include electronic shutter, mechanical shutter and B-door. First of all, talk about the difference between electronic shutter and mechanical shutter. The difference between them lies in the principle of controlling the shutter. For example, the electronic shutter controls the shutter time through the principle of controlling the shutter coil magnet by the circuit, and the gears and linkage parts are mostly made of plastic. The principle of mechanical shutter control is gear drive control time, and the linkage and gear are mostly made of copper and iron. The former is easy to be destroyed by wind and sand, and the latter is also afraid of wind and sand erosion, but it is clean and convenient.

The working principle of the shutter is as follows: in order to protect the photosensitive device in the camera from exposure, the shutter is always closed; When shooting, after adjusting the shutter speed, just press and hold the shutter release button of the camera (that is, the camera button), so that the light passing through the camera lens can be correctly exposed between the opening and closing of the shutter, and the light can enter the photosensitive device through the shutter and be written into the memory card.