Explain the function of two parameters? Due to long exposure. I use fv5 camera.

In fact, controlling exposure and opening the shutter are the same concept.

This involves the concept of shutter in photography.

The unit of shutter is time, that is, seconds.

The longer the shutter time, the more light the camera can get, so that a clear picture can be obtained in a dark scene.

Back to the original question, the exposure control here is that the camera automatically sets a shutter time for you according to the environment. Auto means automatic, the short one is shorter than the automatic one, and the long one is longer than the automatic one, so you will get more light and the picture will be brighter and longer.

Opening the shutter is equivalent to manual operation. No matter what your environment is, the exposure time is 1 second, 2 seconds, 5 seconds or customized. If a shutter is set, the system will take the shutter as the standard.