What is the meaning of depth of field in film shooting?

The depth of field refers to the distance range that an object measured along the axis of the imaging depth of field machine can obtain a clear image in front of the camera lens or other imagers. After focusing, a clear image can be formed in the range before and after focusing, which is called the depth of field. There is a certain length of space in front of the lens (before and after focal length adjustment). When the subject is located in this space, its imaging on the negative is just between the two diffusion circles before and after focusing. The length of the space where the subject is located is called the depth of field.

(1), the larger the lens aperture, the smaller the depth of field; The smaller the aperture, the greater the depth of field;

(2) The longer the lens focal length, the smaller the depth of field; The shorter the focal length, the greater the depth of field; (3) The farther the shooting distance, the greater the depth of field; The closer the distance, the smaller the depth of field.

For example, in this picture, within the range of the second battery from top to bottom, the imaging is relatively clear, and this range is called depth of field.

Novices often pursue shallow depth of field. Indeed, it can make your photos more prominent and artistic. But not all occasions should pursue the ultimate shallow depth of field. For example, landscape photography, in most cases, shallow depth of field is not appropriate. When shooting tourist portraits, too shallow depth of field will also blur the beauty, so it is not suitable for shallow depth of field at this time. Even if you shoot still life and ecology, the depth of field is not as shallow as possible. At least let your whole subject be within the depth of field.