About aperture

Different lenses have different maximum and minimum apertures.

We use the f value to represent the aperture size. The complete series of F values are: F 1.0, F 1.4, F2.0, F2.8, F4.0, F5.6, F8.0, F1,F 16, F2. Many digital cameras can adjust the aperture to the level of 1/3, so the aperture f values such as F 1.8, F2.2, F9 and F 10 appear.

The smaller the f value of the aperture, the larger the aperture (as shown on the right), and the more light entering per unit time.

The amount of light entering each aperture is twice that of the next aperture. In other words, the light of F5.6 is twice that of F8.0. Using this point, the aperture and shutter parameters needed for accurate exposure can be calculated. For example, under the same lighting conditions and the same sensitivity, the photo exposure with aperture F8.0 and shutter 1/200 seconds is the same as that with aperture F5.6 and shutter 1/400 seconds.

Aperture has an influence on the depth of field: the larger the aperture (the smaller the F value), the smaller the depth of field, and the smaller the aperture, the greater the depth of field. Therefore, when taking close-up portraits, use a large aperture, which will form the effect of blurring the background; When shooting scenery, use a small aperture above F8.0.