Preflash Function For Red-Eye Reduction; Automatic Af Measuring Beam - Metz MECABLITZ 44 AF-1 digital Mode D'emploi

10.5 Preflash function for red-eye
reduction
Various cameras offer the possibility to
activate a preflash for red-eye reduction.
This function only supports the flash unit
integrated in the camera. It does not
support external flash units.
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11 Automatic AF measuring
beam
The automatic AF measuring beam
activated in the flash unit by the camera
when the ambient lighting conditions
become inadequate for automatic focu-
sing. A striped pattern is projected onto
the subject which the camera can use to
focus. Depending on the camera's activa-
ted AF sensor, the AF beam has a range
of approximately 6 m to 9 m (with a stan-
dard 1.7/50 mm lens). 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.
To activate the automatic AF measuring
beam the camera must be set to the
„Single AF" autofocus mode 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 measu-
ring beam of the flash unit is not activa-
ted (as in the case of compact cameras;
see the camera's operating instruc-
tions).
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