What are the control skills of depth of field?

The depth of field is the spatial depth at which the photographed scene can be clearly imaged, that is, the distance from the nearest point to the farthest point of a clearer image. In the range of depth of field, the definition of the scene image located on the focal plane is the highest, and the definition of other images decreases in direct proportion to the distance from the focal plane. So how to control the depth of field? Below I have compiled the skills of controlling the depth of field for everyone, hoping to help you!

Depth of field control skills

Controlling the depth of field is one of the main techniques in photography. By reducing the depth of field, important scenes can be clearly represented, while minor scenes that do not need to be highlighted are blurred; Enlarge the depth of field to make more scenes, even all scenes, in a clear state. These characteristics of depth of field give the adjustment of depth of field a unique role in photography creation.

Highlight the theme image

By compressing the depth of field and focusing accurately, the subject is clear and realistic, and at the same time, the background, foreground and unnecessary scenery of the subject are blurred, resulting in the contrast between the reality and the reality of the subject, thus achieving the original intention of highlighting the subject, usurping the host's role and enhancing the artistic appeal.

Show the details of the picture

By extending the depth of field, the whole picture is sharp and clear, which better shows the texture and details of the scene. For example, in landscape photography, famous mountains and rivers, urban scenery and so on. Each landscape has its own uniqueness. Only by adopting the creative technique of small aperture and large depth of field can the connotation of landscape works be better presented.

Affect the perspective effect

The large aperture is used to create a small depth of field, and the layering and spaciousness of the scene in the picture are highlighted by the contrast between reality and reality to enhance the perspective effect. Using a small aperture to create a large depth of field makes the whole picture clear and uniform, which is conducive to compressing the sense of space of the picture and weakening the perspective effect. Using the control of depth of field to influence the perspective effect of the picture is conducive to the realization of the creative purpose and the improvement of the aesthetic value of the picture.

The depth of field mainly depends on four factors: aperture size, lens focal length, shooting distance and the size of photosensitive element. Among them, the larger the aperture, the shallower the depth of field, the smaller the aperture and the deeper the depth of field; The longer the focal length of the lens, the shallower the depth of field and the deeper the depth of field; The closer the shooting distance, the shallower the depth of field, and the farther the distance, the deeper the depth of field; Under the same equivalent focal length, the larger the size of the photosensitive element of a digital camera, the shallower the depth of field, and vice versa. In photography creation, people often use the aperture setting to control the depth of field in order to achieve the shooting intention.

Controlling depth of field with large aperture

Usually, a lens with an aperture f value less than 5.6 is considered as a large aperture. The foreground and background of shallow depth-of-field images shot with large aperture are blurred, and the overall picture is hazy and has a strong three-dimensional sense. Using a large aperture at the same time has two advantages: first, it can increase exposure. Especially in low light conditions, the shutter speed can be appropriately increased after using a large aperture to ensure the shooting quality. Second, it can make the subject clearer. Compared with the small aperture, the resolution of the scene on the focal plane is improved, especially in the shooting of still life.

Enlarging depth of field with small aperture

The f value of lens aperture greater than 8.0 is usually called small aperture. The foreground and background of the image taken with a small aperture are clear. However, when using a small aperture, it is often necessary to reduce the shutter speed to meet the exposure conditions. Especially in the case of weak light, too low shutter speed is easy to blur the picture. At this point, you need to use a tripod to keep the camera stable. If necessary, use the remote controller or cable releaser to release the shutter to achieve a clear imaging effect.