Hasselblad SWC/M - Focusing Techniques and Depth of Field; Focusing ring operation; Depth of field explanation

The shutter speed ring (35) and the aperture
ring (30) can be cross-coupled by pressing the
cross-coupling button (7). When this button
is depressed, the shutter speed/aperture com-
bination can be changed without altering the
exposure value (EV).
Should you, for example, wish to change
from f/8 to f/11, the shutter speed ring will
automatically switch to the corresponding
Shutter speed when the shutter speed and
aperture rings are cross-coupled.
Focusing (Figs. 14—15)
The lens is focused with the focusing ring (4).
The ring is turned until the subject is as sharp
as possible on the focusing screen. “Rock”
the ring back and forth around the point of
apparent sharp focus a few times for maxi-
mum focusing accuracy.
The distance between the subject and the film
plane is read off on the distance scale (10)
opposite the central index (5). The distance in
meters is shown in white numerals, and the
distance in feet is in orange numerals.
Objects on the near or far side of the set dis-
tance can be sharp within certain limits. The
limits for this field of sharp focus, i.e. depth
of field, vary with the f/stop.
^ small f/stop yields wide depth of field.
A large f/stop yields shallow depth of field.
The depth of field available at any given
f/stop can be read off on the depth-of-field
scale (6) on both sides of the central index (5).
In the example shown here (Fig. 15), the lens
is set at 7 m. Depth of field at f/11 will then
range from 4 m to 20 m. (Also see ‘‘Depth-of-
field Preview" on p. 7.)
Fig 14
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