What is the use of depth of field in photography, the function of depth of field and the method of controlling depth of field

The depth of field in photography is a very practical skill in photography, but some friends still don't understand the purpose of depth of field. What is the depth of field in photography? How to control depth of field in photography? Let me introduce it to you. Let's have a look.

What is the use of depth of field?

The control of the depth of field can directly affect the prominence of the photo theme and the overall effect (layering) of the picture.

What is the depth of field in photography?

The distance from the nearest point to the farthest point that makes the subject produce a clearer image is the depth of field. It is also the spatial depth at which the subject can be clearly imaged. In the depth of field, the sharpness of scene images is not completely consistent, among which the sharpness of focus is the highest, and the sharpness of other images decreases in direct proportion to their distance from focus.

So it can be concluded (or simply put) that the depth of field depends on the position of the focus.

How to control the depth of field?

Adjust the position of the focus, and the depth of field will naturally be adjusted. I believe everyone knows the factors that affect the focus position: aperture, focal length and camera distance (object distance).

The relationship between these three factors and depth of field is as follows:

1, large aperture and small depth of field; Small aperture and large depth of field.

2. Long focal length and small depth of field; Short focal length and large depth of field.

3, the object distance is close, and the depth of field is small; The object is far away and the depth of field is large.

The above is the depth of field in photography and how to control it. I hope it helps you.