Photographic aperture

Aperture is a device used to control the amount of light entering the lens and reaching the photosensitive element of the fuselage, usually in the lens. We all know that we can't change the size of the lens. We can change the amount of light entering through the aperture.

Aperture is a camera lens composed of several extremely thin metal sheets, through which light can pass.

The light entering the lens is controlled by changing the size of the hole.

Aperture is not only used to adjust the exposure, but also to control the depth of field of the picture. The relationship between depth of field and aperture is that the larger the aperture, the shallower the depth of field, and the smaller the aperture, the deeper the depth of field. The smaller the aperture, the greater the corresponding f value, which is opposite to the aperture.

For example, the value of F 16 is greater than F 1.4, but the aperture size is opposite, which shows the relationship between the numerical value and the aperture size.

When to use a small aperture or a large aperture is mainly based on two factors: shutter and depth of field.

Shutter: it is a door that controls the light in and out. Assuming other values are constant, the faster the shutter speed, the less light will enter, and vice versa.

Depth of field: the choice of depth of field will also affect the size of the aperture. If you want to highlight personal characteristics, choose a small depth of field and blur the surrounding background out of the main body. A small depth of field corresponds to a large aperture.

There are many scenes suitable for small depth of field, for example, macro shooting will focus on the subject and get great results; Some people like to highlight the characteristics of models and better realize stylization.

On the other hand, if you want to shoot a large-scale environment, such as mountains, fields or the sea, or take a group photo, you need to make the picture of the whole photo clear and consistent, and at the same time avoid the blur caused by the focus error. Large depth of field corresponds to small aperture.

To sum up, the aperture can change the shutter speed, create different depth of field and affect the imaging quality.