Function Introduction:
1. Depth of field refers to the relatively clear imaging range of the camera before and after the focus.
2. In optics, especially video or photography, is a description of the range of distances that can be clearly imprinted in space.
Although a lens can focus light only to a certain distance, away from which it becomes blurred, the image becomes indistinguishable from the naked eye over a certain distance, which is called the depth of field.
3. When the focus is at the hyperfocal length, the depth of field extends from half the hyperfocal length to infinity, which is the maximum depth of field for a fixed aperture.
Calculation of Depth of Field:
The depth of field is usually determined by the object distance, the focal length of the lens, and the aperture value of the lens.Except at close range, the depth of field is generally determined
by the magnification of the object and the aperture of the lens.
1. When fixing the aperture, increasing magnification, whether closer to the subject or using a long focal length lens, will reduce the depth of field;When you reduce the magnification, you increase the depth of field.
2. If the magnification is fixed, increasing the aperture (reducing the aperture) will increase the depth of field.Decreasing the aperture (increasing the aperture) reduces the depth of field.For some images,
such as landscape photography, a larger depth of field is more suitable, while in portrait photography, a smaller depth of field is often used for composition, resulting in the so-called background blur effect.
Because of the advances in digital imaging, the sharpness of the image can be changed by a computer system, so the depth of field can be changed by a computer system.