Overview of photographic depth of field

Many novice photographers have heard of depth of field, but they are confused about its concept and application.

Then Xiao Xiangxiang will give you a detailed explanation today.

Depth of field refers to the range of the distance between the front and back of an object measured by imaging in front of a camera lens or other imager. After focusing, a clear image can be formed in the range before and after focusing, which is called depth of field.

Before and after the focus, the light began to gather and spread, and the image of the point became blurred, forming an enlarged circle called the diffusion circle. Based on the photographer with a camera, the distance from the focus to the near allowable circle of dispersion is called the foreground depth of field, and the distance from the focus to the far allowable circle of dispersion is called the back depth of field. As shown in the following night view and scenic spot map.

Three factors affecting depth of field

Lens aperture, focal length and shooting distance are important factors affecting depth of field.

(1) lens aperture

The larger the aperture, the shallower the depth of field; The smaller the aperture, the deeper the depth of field.

(2) Lens focal length

The longer the focal length of the lens, the shallower the depth of field; The shorter the focal length, the deeper the depth of field.

(3) Shooting distance

The farther the distance, the deeper the depth of field; The closer the distance, the shallower the depth of field.

This photo was taken with a large aperture and a long focal length, forming an obvious shallow depth of field effect.