Depth of field us the range of distance that appears sharp. It varies depending on camera type, aperture and focusing distance. Print size and viewing distance can also influence our perception of depth of field.
Focal length affects depth-of-field. The term depth-of-field refers to distances from the camera that are in focus. Depth-of-field is not solely related to the aperture of a lens. With a longer lens, the depth-of-field is reduced, thus throwing the background more out of focus and isolating the subject.
Often, this is an desired effect for portraits. In choosing a longer focal length, you can isolate the area occupied by the subject and shift the viewer’s focus on the subject. Greater depth of field through use of wider focal lengths helps to include the surrounding scene.
Wide depth of field:
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