What can the aperture control besides adjusting illumination?

In addition to adjusting lighting, the device can also control the depth of field.

Depth of field refers to the size of the blank area between the foreground and background in a photo, which can be controlled by adjusting the aperture. The larger the aperture, the shallower the depth of field, and only part of the foreground and background remain clear; The aperture becomes smaller, the depth of field becomes deeper, and the whole picture will be relatively clear.

Therefore, by controlling the size of the aperture, photographers can create different shooting effects, such as highlighting the theme, creating an atmosphere and so on.