Photographic depth of field

Depth of field (photogrammetry and remote sensing)

Depth of field (DOF) refers to the distance range between the front and back of an object measured by imaging in front of a camera lens or other imagers. Aperture, lens and the distance from the focal plane to the subject are all important factors that affect the depth of field. After focusing, the distance between clear images before and after focusing is called depth of field.

Aperture, the distance between the lens and the subject are important factors affecting the depth of field;

1, the larger the aperture (the smaller the aperture value f) and the shallower the depth of field, the smaller the aperture (the larger the aperture value f) and the deeper the depth of field.

2. The longer the focal length of the lens, the shallower the depth of field, and vice versa.

3. The closer the subject is, the shallower the depth of field is, and the farther the subject is, the deeper the depth of field is. When shooting, the process of clearly imaging the scene at a certain distance from the camera is called focusing, and the point of focusing is called focus. Because "clarity" is not an absolute concept, the image of the scene at a certain distance before and after focusing can be very clear, and the sum of the range before and after focusing is called depth of field.

The foreground depth of field is smaller than the back depth of field, that is to say, after precise focusing, the scene in front of the focus can be clearly imaged, while the scene in the distance behind the focus is clear.