Preflash Function For Red-Eye Reduction; Multi-Zone Af Measuring Beam - Metz 58 AF-1 digital Bedienungsanleitung

Note that in the case of HSS high-speed synchronisation the guide num-
ber of the flash unit also depends on the shutter speed. The faster the
shutter speed, the lower the guide number. The settings are made in the
Mode menu

16 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 inter-
nal 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
(2nd curtain) is not possible when the preflash function is used.
120

17 Multi-zone AF measuring beam

The multi-zone AF measuring beam
camera when the ambient lighting conditions become inadequate for automatic
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 ran-
ge of approximately 6 m to 9 m (with a standard 1.7/50 mm lens). The maxi-
mum 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
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 beam. In this case, the multi-
zone AF measuring beam
case of compact cameras; see the camera's operating instructions).
Low-speed zoom lenses can significantly curtail the range of the AF measuring
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.
is activated in the flash unit by the
is to be activated by the camera,
of the flash unit is not activated (as in the