Hasselblad SWC/M - Depth-of-field indicators

Objects on the near or far side of the set dis-
tance may also be in focus within certain lim-
its. The limits for this area of sharp focus,
depth of field, vary with the aperture. A small
aperture yields wide depth of field, a large
aperture yields shallow depth of field.
The depth of field available at any given aper-
ture is automatically designated on the dis-
tance scale by the depth-of-field indicators.
There is greater depth of field on the far side
of the distance set than on the near side.
Depth-of-field indicators (Fig. 65)
The automatic depth-of-field indicators (11)
greatly simplify focusing. They consist of two
moving pointers. The distance between the
pointers changes when the aperture setting is
changed. The largest aperture provides shal-
low depth of field, so the distance between the
pointers is narrow at this f/stop. A small
aperture, such as f/22, yields wide depth of
field, and the distance between pointers is
then wide. See Fig. 65. The thin ring shows
the position of the depth-of-field indicators at
the largest aperture (f/2.8). The thick ring
shows the position at the smallest aperture
(f/22).
Some practical tips
Proceed as follows if you have predetermined
a desired depth of field. Focus on the closest
part of the subject and read off the distance
on the distance scale. Do the same thing for
the most distant part of the subject. Set the
depth-of-field indicators so they point to the
two distances obtained. In sports photogra-
phy, for example, you can preset the depth-
of-field indicators to the desired depth of fi-
eld. All the action within these preset distance
limits will then be in sharp focus.
Fig 64
Fig 65
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