Factors affecting depth of field

When the focal length, object distance and aperture of the lens are fixed, there are three factors that affect the depth of field. First, the aperture size, the larger the aperture, the smaller the depth of field. Second, the length of the focal length, the shorter the lens focal length, the greater the depth of field. Third, the distance of the object, the farther the object is from the camera, the greater the depth of field.

Factors affecting depth of field

Usually, when shooting an object with a lens, only one plane of the object is clearly focused, and there is an acceptable clear range before and after, which is called "depth of field". The range that can be clearly imaged in front of the object focus is called foreground depth of field, and the range that can be clearly imaged in the back is called back depth of field.

According to the factors affecting the depth of field, if the photographer wants to highlight the object itself and have a small depth of field, he can shoot with a large aperture, a telephoto lens and close to the object. On the contrary, he can get an image with a sharp contrast between the depth of field and the object image, so as to clearly display the far and near scenes to the greatest extent.