Coordination of aperture, shutter and sensitivity

With the increasingly high-end photographic equipment, our mobile phones and cameras will have adjustment options such as aperture, shutter and ISO. Aperture, shutter and ISO are three elements of exposure:

The larger the aperture, the more light enters.

The slower the shutter is, the more light comes in.

The higher the ISO, the more light enters.

1. As can be seen from the figure, the aperture is represented by f, and the smaller the number behind it, the larger the aperture (inversely proportional). Large aperture (such as f/ 1.4, f/ 1.8, f/2.8, etc.). ) has a large amount of light, which can brighten photos in the dark, or cooperate with the shutter to "freeze" fast-moving objects (such as birds, planes and athletes), and can also take close-ups of people with blurred backgrounds. Small aperture combined with slow shutter can shoot running water, star track, car track and so on. And you can shoot lights.

2. Let's look at the shutter speed again. The bigger the denominator, the clearer it is, and the trajectory of the denominator will be connected into a line.

3. Finally, the sensitivity is expressed by ISO. The smaller the number, the lower the sensitivity, and vice versa. The picture with low sensitivity is clear, and the picture with high sensitivity has more noise.

Extended data:

It is worth noting that the smaller the f value of the aperture, the larger the aperture (as shown on the right), and the more light entering in the same unit time, the light entering in the upper level is exactly twice that of the lower level.

For example, if the aperture is adjusted from F8 to F5.6, the amount of light entering will double. We also say that the aperture is enlarged by one level. The luminous flux of F5.6 is twice that of F8. Similarly, F2 is 16 times the luminous flux of F8. When F8 is adjusted to F2, the aperture is enlarged by four levels.

For ordinary digital cameras, the aperture f value is often between F2.8-F 1 1. In addition, many digital cameras can adjust the aperture by 1/3.

Reference link: Baidu Encyclopedia-Camera Aperture