Depth of field is defined as the zone of sharpness before and behind the plane of focus. It depends on cam- era subject/distance, focal length of lens, aperture setting and distance the lens is focused at.
Reading the Depth of Field Scale
In addition to visual observation, the Depth of Field can be determined by using the Depth of Field Scale on each lens. f/stop numbers appear on both the right and left side of the red index mark in the center of the scale ring. Simply read the figures which appear above the f/stop num- bers on the distance scale of the Iens.
For example, with the 80mm f/2.8N lens focused at 3m and the aperture set at f/22, the depth of field scale indicates that the zone of sharp fo- cus will extend from about 2m to 6m.
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