What is the shutter gain of the camera?

Shutter and gain are two nouns, and their functions are as follows:

Shutter: A mechanical device used by a shutter camera to control the effective exposure time of photographic film. It is an important part of the camera, and its structure, form and function are important factors to measure the grade of the camera. Generally speaking, the larger the shutter time range, the better. Low seconds is suitable for shooting moving objects, and the shutter speed can be as fast as116000 seconds, making it easy to capture fast moving targets. However, when the traffic is busy at night, the shutter time will be lengthened, and the silky water flow effect in ordinary photos can only be photographed with a slow shutter.

Gain: The video signal output by the camera must reach the standard level stipulated by TV transmission, that is, in order to output the standard video signal under different scene lighting conditions, the gain of the amplifier must be adjusted in a large range. This gain adjustment is usually done automatically by detecting the average level of the video signal. The circuit that realizes this function is called automatic gain control circuit, or AGC circuit for short. The sensitivity of the camera with AGC function will be improved in low illumination, but the noise will be more obvious at this time, because the signal and noise are amplified at the same time.