Hasselblad 500C/M Instruction Manual page 16

Fig 26
Fig 27
KNOB FOR FILM ADVANCE AND
SHUTTER COCKING (Figs. 26—27)
An interchangeable knob for film advance
and shutter cocking is standard equipment
with each new camera. This knob can be re-
placed with a crank or a knob with a built-in
exposure meter.
The knob has two functions:
* To advance the film.
๑ To set up the camera for a new exposure by
actuating the mechanism which flips down
the mirror, reopens the diaphragm, and
cocks the shutter. Knob operation also
actuates the film advance and shutter status
indicator signals (see also p. 18).
Note The shutter release may refuse to
budge for one of the following
reasons:
* The last film frame has been exposed. This
automatically blocks the shutter release.
There will then be no number in the frame
counter.
* The magazine slide has not been with-
drawn.
The knob may refuse to budge for one of the
following reasons:
* The time exposure lock is set at T.
* The auxiliary shutter was tripped with the
release button but the shutter release was
not subsequently pressed to trigger the leaf
shutter (see p. 13).
Changing the knob
It is best to change the knob with the camera
tensioned.
Knob removal: Push the spring-loaded re-
lease catch (26) away from the camera while
bayoneting off the knob counter-clockwise.