What is the shutter in photography? What does it have to do with aperture?

The shutter is an object like a curtain, standing in front of the film. The material can be steel plate or fiber products, usually two layers are stacked together. Usually, the shutter is closed in front of the film, so the film will not be sensitive and there will be no image. Press the shutter button when taking pictures, and the two curtains separate to form a gap, which passes in front of the film vertically or horizontally. The time when each point on the film is illuminated by light is the travel time of that gap, which is what we call shutter speed. The wider the gap, the longer the travel time and the slower the shutter speed (that is, the smaller the denominator of the fraction representing the speed). Therefore, the slower the shutter, the longer the film exposure time, the greater the exposure and the brighter the photo.

The digital camera cancels the shutter curtain and uses the photosensitive device cmos or ccd as the shutter, which is called "electronic shutter", that is, the photosensitive time can be controlled electronically.

The aperture is the actual aperture of the lens, which is surrounded by a group of metal sheets. Obviously, the larger the aperture, the larger the aperture, the more light enters through the lens, the greater the exposure, the brighter the photo, and vice versa.

Therefore, both shutter and aperture can control the actual exposure, so they are often used in combination, so we can see that a given parameter of a photo will have both aperture and shutter value.