7Depth of Field

Depth of field is the range of object distances over which objects appear acceptably sharp in a photographic image when viewed at the normal viewing distance. A small depth of field, where objects in front of and behind the plane focused on appear unsharp, is often used to direct the viewer’s attention to a certain part of the photograph and strengthen the perspective, whereas a large depth of field is used where obtaining detail in all parts of the subject is the primary objective. A number of factors including lens focal length, film size, object distance, the f-number used when taking the photograph, and the distance at which the photograph is viewed, determine the actual depth of field obtained in a photograph.

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