speeds. If you need the full light output
of the flash unit, you should not select a
shutter speed that is any faster than
1/125 sec.
10.2 Normal synchronisation
In normal synchronisation the flash unit
is triggered at the beginning of the shut-
ter time (first curtain synchronisation).
Normal synchronisation is the standard
mode on all cameras. It is suitable for
most flash shots. The camera, depending
on the mode being used, is switched to
the flash sync speed. Speeds between
1/30 sec. and 1/125 sec. are customa-
ry (see the camera's operating instruc-
tions).
No settings are necessary on the flash
unit, nor is there any display for this
mode.
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10.3 Second curtain synchronisa-
tion (REAR)
Some cameras offer the option of
second-curtain synchronisation (REAR),
in which the flash unit is not triggered
until the end of the exposure time.
This is particularly advantageous when
used with lower shutter speeds (slower
than 1/30 sec.) and moving subjects
that have their own source of light. With
second-curtain synchronisation, a
moving light source will trail a light stre-
ak instead of building one up ahead
itself, as it does when the flash is syn-
chronised with the first shutter curtain. In
this way a „more natural" image of the
photographic situation is produced!
Depending on its operating mode, the
camera sets shutter speeds slower than
its sync speed.
On some cameras the REAR function is
not possible in certain operating modes
(e.g., certain vari- or subject programs,
or with red eye reduction). In these
cases, the REAR mode cannot be selec-
ted and/or is automatically cancelled or
ignored (see camera's operating instruc-
tions).