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camera’s operating instructions). „FP“ will then also appear on the flash unit’s
display panel, for example.
19. Preflash function for red-eye reduction
The red-eye effect occurs when the person being photographed is looking
more or less straight into the camera, the ambient lighting is poor, and the
flash unit is mounted close to the camera. The flash unit then illuminates the
interior of the subject’s eyes through the pupils.
Some camera models have a preflash function for reducing the red-eye
effect. One or more preflashes induce the pupils to contract more, thereby
reducing the red-eye effect.
On some cameras, the preflash function supports only the camera’s
internal flash unit or an illuminator incorporated in the camera body
(see the camer’s operating instructions). The preflash function is set on
the camera (see the camera’s operating instructions). Second curtain
synchronisation (REAR) is not possible when the preflash function is
used.
20. Multi-zone AF measuring beam
The multi-zone AF measuring beam
is activated in the flash unit by the
camera when the ambient lighting conditions become inadequate for auto-
matic focusing. It projects onto the subject a striped pattern that the camera
can use to focus. Depending on the camera’s activated AF sensor, the
AF beam has a range of approximately 6 m to 9 m (with a standard
1.7/50 mm lens). The maximum flash range is reached with the camera’s
central AF sensor. Parallax error between lens and AF measuring beam limits
the close-up range with the AF measuring beam to approximately 0.7 m to
1 m.
If the multi-zone AF measuring beam
is to be activated by the
camera, the „single AF (S)“ autofocus mode 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
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beam. In this case, the multi-zone AF measuring beam
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 measu-
ring beam.
Some cameras support the AF measuring beam in the flash unit only with the
camera’s central AF sensor. If a peripheral AF sensor is selected, then the AF
measuring beam will not be activated in the flash unit.
21. Wireless remote operation
Wireless remote operation is compatible with the Nikon Advanced Wireless
Lighting system. In this system, the exposure of one or more slave flash units
is controlled remotely by a master flash unit on the camera. The slave flash
unit(s) is/are triggered by wireless remote control by the secondary reflector
of the master flash unit. The light of the secondary reflector does not contri-
bute to the exposure of the shot in this case.
The slave flash unit is assigned to one of three possible groups (A, B or C).
Each of these groups may consist of one or more slave flash units. The flash
modes TTL or manual M can be set for each group separately on the master
flash unit.
So that multiple remote systems in the same room do not interfere with one
another, there are four independent remote channels available. Master and
slave flash units belonging to the same remote system must be set to the same
remote channel. The slave flash units must be able to receive the light from
the master flash unit with the integrated photo sensors.
Remote flash operation also supports second curtain synchronisation.
The secondary reflector is not supported by remote flash operation. In
remote flash mode the maximum flash range is not indicated on the
flash unit’s display panel.
21.1 Switching remote operation on and off
• Press the „Sel“ key repeatedly until „Select“ appears on the display.
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