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7 Automatic flash sync speed control
Depending on the camera model and camera mode,
the shutter speed is switched to flash sync speed when
flash readiness is reached (see the camera’s operating
instructions).
Shutter speeds cannot be set faster than the flash sync
speed, or they are switched automatically to the flash
sync speed. Various cameras have a sync speed range,
for example from 1/60 sec to 1/250 sec (see the
camera’s operating instructions). The sync speed set by
the camera depends on the camera mode, the ambient
light, and the focal length of the lens used.
Shutter speeds slower than the flash sync speed can be
set according to the camera mode and the selected
flash synchronisation.
In cameras with a between-the-lens shutter, the flash
sync speed is not controlled automatically. As a result,
the flash can be used at all shutter speeds.
8 Automatic AF auxiliary light
With system cameras, the AF auxiliary light is possible
only if the camera supports it.
The automatic AF auxiliary light
is activated in the
flash unit by the camera when the ambient lighting
conditions become inadequate for automatic focusing.
The white video LED is activated and the subject on
which the camera can focus is illuminated. The range is
approx. 6- 9 m (with a standard 1.7/50 mm lens).
Parallax error between lens and the AF auxiliary light
limits the close-up range with the AF auxiliary light
to
approx. 0.7 m to 1 m.
If the AF auxiliary light
is to be activated by the
camera, the “Single AF (S)” or “ONE SHOT” autofocus
mode of operation must be set on the camera and
the flash unit must indicate flash readiness. Some
camera models support only the camera’s internal AF
measuring beam.
In this case, the automatic AF auxiliary light
of the
flash unit is not activated
(as in the case of compact cameras; see the camera’s
operating instructions)!
Low-speed zoom lenses can significantly curtail the
range of the AF auxiliary light
!
