The depth of field (DOF) is a parameter used in optics andphotography to define the scope within which the objects observed by the optical devicegives the impression of acute (ie, with clear, nierozmazane contours).
The large depth of focus provides the focus of most elements in the picture, but littledepth of field (the precise focus at the subject item and blurred background) is sometimes highly desirable for portraits and art, because the subject is isolated against the background of the environment.
Immediately, the extent of depth of field are the following factors:
- aperture - the smaller the aperture is left (ie: the higher the aperture, eg, 16 or 22), thegreater the depth;
- the distance at which it is set to focus the lens (the distance between the object and the camera) - the distance is less, the depth of field as well.
- focal lenght
Indirectly, the extent of depth of field is affected:
- resolution and the size of the sensor / film