Difference between revisions of "Depth of field"
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'''Depth of field''' is a measure of the zone of distances (from near to far) that are within acceptable sharpness at a given aperture and focus distance. | '''Depth of field''' is a measure of the zone of distances (from near to far) that are within acceptable sharpness at a given aperture and focus distance. | ||
Revision as of 20:30, 22 July 2005
see also lens
Depth of field is a measure of the zone of distances (from near to far) that are within acceptable sharpness at a given aperture and focus distance.
When a lens is focused on a subject at a given distance, all subjects at that distance are sharply focused. In theory, subjects that are not at the same distance are out of focus, and thus not sharp. However, since human eyes cannot distinguish very small degree of unsharpness, some subjects that are in front of and behind the sharply focused subjects may still appear to be sharp. The zone of acceptable sharpness is referred to as the depth of field. Thus, increasing the depth of field increases the perceived sharpness of an image. Using smaller apertures increases the depth of field.
Links
- Depth of field explained by Ching-Kuang Shene
