How do you explain the shutter time and exposure time of digital cameras? What's their difference?

When shooting, the camera controls the amount of light received by adjusting the shutter opening speed (referred to as speed) and the lens aperture (referred to as aperture). The shutter is used to control the exposure time of the external light source. Shutter speed in a camera is usually expressed as 1 sec,1/2s,1/4s,1/60s,1/025s,1/500s, etc. The "B" door is a special setting. When the speed is set at Gate B, press the shutter button and the shutter will open. When the shutter button is released, the shutter closes. Therefore, door B is generally used in situations with extremely weak external light, such as shooting at night. For example, the exposure time of 1/60 seconds is twice that of1125 seconds.

& ltP> Another way to control exposure is to change the aperture of the lens. The opening and closing of the camera lens is realized by a set of blades called apertures in the lens. The opening degree is expressed by the value of "f", which is generally marked on the lens with 1.4, 2, 2.8, 4, 5.6, 8, 1 1, 16, 22, etc. The larger the aperture (F value), the smaller the aperture and the smaller the luminous flux. Same as the shutter opening speed. The luminous flux of adjacent apertures also doubles.