Hasselblad SWC/M - Exposure Controls and Functions; Time exposure lock; Pre-release function

Fig 24
Fig 25
As a general rule for all exposure with the
time exposure lock 15 at the O setting, the
shutter release must be kept depressed until
the between-the-lens shutter has opened and
closed fully. This is especially important at
shutter speeds from 1 s to 1/15 s.
If pressure on the release is relaxed too soon,
the auxiliary shutter will terminate the expo-
sure prematurely.
The cable release is screwed into the threaded
socket in the shutter release.
Time exposure lock
The time exposure lock (15) has two settings:
О (= disengaged) and T (= depressed shutter
release locks in the depressed position until
the lock is returned to the O setting).
The T setting can thus be used for time expo-
sure when the shutter is set at B.
Film cannot be advanced until the lock is reset
to O.
The setting cannot be used in operation with a
cable release.
Pre-release (Fig. 25)
To reduce the low level of camera-induced
shake to a minimum, the camera can be pre-
released by pressing the pre-release button
(17). This is what happens when the pre-
release button is pressed: the mirror flops up,
the lens stops down to the preset working
aperture, the auxiliary shutter opens, and the
shutter closes (but remains cocked).
When the shutter release is pressed, only the
operation of the between-the-lens shutter
remains. Since the image on the focusing
screen disappears in a pre-released camera, a
sports viewfinder is a good way to keep track
of moving subjects.
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