What's the difference between large depth of field and small depth of field?

A large depth of field means a large vertical clear range of photos. A small depth of field means a small vertical clear range of the photo.

Large depth of field highlights objects from far and near, and the scenes from near and far in the picture are clear, so it is necessary to use large depth of field.

A small depth of field highlights a certain part of an object. When it is necessary to highlight something or a part of something in the picture with a small depth of field, it should be a small depth of field.

Extended data:

There are usually three reasons that affect the depth of field:

1. The larger the aperture, the shorter the depth of field, and the smaller the aperture, the longer the depth of field.

When the shooting distance is constant, when shooting with a small aperture, the clear range of the scene before and after the subject will become longer because of the larger depth of field. When a large aperture is used, the clear range of the scene before and after the subject will be shortened.

2. The longer the focal length, the shorter the depth of field, the shorter the focal length and the longer the depth of field.

When the aperture and shutter are the same, shooting the same scene and using a long lens will make the depth of field shallow. When using a wide-angle lens, the depth of field will be longer.

Using a long lens on the left and a wide-angle lens on the right can show the difference in depth of field.

3. The closer to the subject, the shallower the depth of field, and the farther away from the subject, the longer the depth of field.

With the aperture, shutter and lens focal length unchanged, the closer you are to the subject, the shallower the depth of field will be. The farther away from the subject, the longer the depth of field.

References:

Baidu encyclopedia-depth of field lens