Depth of focus意思

"Depth of focus" is a term used in photography and optics to describe the range of distance over which a camera lens can be focused onto the film or sensor and still produce an image that is reasonably sharp. It is also known as "depth of field."

The depth of focus is determined by several factors, including the aperture of the lens, the focal length of the lens, and the distance between the lens and the subject. A lens with a wide aperture (small f-number) will typically have a shallower depth of field, meaning that only a small range of distances will be in focus. A lens with a narrow aperture (large f-number) will have a deeper depth of field, meaning that a larger range of distances will be in focus.

The depth of focus is an important consideration for photographers, as it allows them to control the sharpness of the image and to create the desired visual effect. For example, a photographer might use a shallow depth of field to isolate a subject from the background, or to create a sense of depth and dimensionality in the image. Conversely, a photographer might use a deeper depth of field to ensure that the entire scene is in focus, or to create a more natural and realistic looking image.