Since the shutter speed can determine the amount of light entering, why stop?

The function of the camera shutter is mainly to control the exposure time. The faster the shutter speed, the shorter the exposure time of light on the film or photosensitive element. The slower the shutter speed, the longer the exposure time of light on the film or photosensitive element. The main function of camera aperture is to control the intensity of light. The larger the aperture, the greater the exposure on the film or photosensitive element. The smaller the aperture, the smaller the exposure on the film or photosensitive element. Through different combinations of shutter speed and aperture, the camera adapts to the different changes of light in the shooting field, so that the film or photosensitive element can be accurately exposed. It is unrealistic to control the accurate exposure of ever-changing light only by shutter speed, and it is impossible to obtain accurate exposure simply by adjusting the aperture size. In photography, photographers can gain more artistic creativity by adjusting the aperture size. For example, by increasing the aperture, the depth of field can be shortened, the foreground and background of the subject can be blurred and the subject can be highlighted; Moreover, lowering the aperture can get a longer depth of field, so that the foreground and background of the subject are within the definition range.