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The Depth
The DepthThe Depth
The Depth-
--
-of
ofof
of-
--
-Field Scale
Field ScaleField Scale
Field Scale
The picture reproduces sharpest those parts of the scene which are at the exact distance
in a plane parallel to the film – on which the lens is focused. This maximum sharpness
gradually falls off in front of, and behind, that focused distance, resulting in a certain zone
within which everything is still acceptably sharp, The extent of this zone of sharpness – the
"depth of field" – depends on the subject distance, the focal length of the lens, and the
aperture. Stopping down increases the sharp field, which is desirable for most subjects
extending appreciably in depth. This also explains the importance of aperture control in
photography.
To find the limits of this zone, look at the depth of field scale of your lens. The sharp zone
is that enclosed between two index lines of the same aperture number. If, for instance, you
have set your 50mm SUMMICRON lens to 15 feet, the available depth of field with an
aperture of f/4 (see red arrows in the
illustration) extends from about 12
1
/
2
to 20 feet. If, however, you stop down
to f/11, the zone of sharpness covers
a field from about 9 to 40 feet. (When
altering the aperture, be sure to adjust
the exposure time accordingly.)
See also page 9: Optical Depth-of-field
Indicator in the measuring field of the combination
range-viewfinder.
5
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5


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