What is the relationship between aperture and depth of field?

Large aperture (small f/ value) will reduce the depth of field, while small aperture (large f/ value) will increase the depth of field.

Depth of field (DOF) refers to the clear part of a photo before and after the focal plane. Large depth of field means that most photos are clear regardless of distance (for example, photos taken with f/22 aperture have very clear foreground and background).

Small (or shallow) depth of field means that only a part of the picture in the photo is clear and the other pictures are blurred. Aperture plays an important role in depth of field.

Extended data:

In most landscape photography, you will see the photographer choose a small aperture. This ensures that all still life from the foreground to the distant horizon is clear.

On the other hand, in portrait photography, it is easy to make the model clear and the background blurred by using the aperture, which can not only highlight the model, but also make other things not distract the audience. At this time, you should choose a large aperture to ensure a small depth of field.