What does the camera aperture do? How to adjust it?

Aperture is a set of approximately circular blades with the following functions:

1. control luminous flux: large aperture (F 1.4) and more light, which can ensure higher shutter speed in low light environment; Conversely, the smaller the aperture (F22), the smaller it is.

2. Control the depth of field: the larger the aperture, the shallower the depth of field (that is, the better the background blur); The smaller the aperture, the clearer the foreground and background (the scene usually uses a small aperture, such as F 1 1~F 16).

3. In flash photography, the aperture can also control the light ratio between flash and ambient light. The ambient light is controlled by the shutter and the amount of flash is controlled by the aperture.

Depth of field: the clear range before and after the focal plane. ?

Adjustment method:

1, SLR and DC with manual function: Turn to aperture priority mode (A or AV), and then turn the thumbwheel on the fuselage;

2. Manual lens: directly rotate the aperture ring on the nose;

3. Some fully automatic DC can't adjust the aperture, but the camera can decide automatically according to the scene at that time.