Nikon FG-20 - Depth of Field

- TECHNICAL INFORMATION-contlnued------- -----'
Depth of Field
When you shoot at a certain aperture and focusing
distance,
you will find that not only the main subject
but also objects within a certain range
in front of and
behind it will be sharp in the final photograph. This
"in-focus zone"
is known as depth of field. Objects
beyond this range become increasingly out of focus.
When this zone of sharpness is large, the depth of
field
is said to be deep; when it is small, the depth of
,field
is said to be shallow.
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The following is true of depth of field :
1.
The smaller the shooting aperture (i . e. , the larger
the numerical f-number), the deeper the depth
of
field ; the larger the aperture, the shallower the
depth of field.
2. The farther away the subject is from the lens, th e
deeper the depth of field becomes; the closer
to
the lens, the shallower the depth of field.
3.
The longer the focal length of a lens, the shallower
the depth of field ; the shorter the focal length,
th e
deeper the depth of field.
4. There
is greater depth of field behind the main sub -
ject than
in front of it.
The depth of field at each aperture is indicated on the
lens
by a set of color-coded lines @ (corresponding
to the colors of the f-numbers @ on the aperture ring
®) which are used in conjunction with the distance
scale
@ on the focusing ring ®. The range is indicated
by the distance between the lines.