Metz MECABLITZ 50 AF-1 digital Sony - Manual (Page 95)

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12 Automatic AF measuring beam
The automatic AF measuring beam is activated in the flash unit by the camera
when the ambient lighting conditions become inadequate for automatic focu-
sing. 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 automatic AF measuring beam ቭ 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 beam. In this case, the automa-
tic 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 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!
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13 Triggering control (auto-flash)
The camera prevents the triggering of a flash if the ambient light level is suffi-
cient for an exposure in the normal mode. The exposure is then completed with
the shutter speed given in the display or viewfinder of the camera. The trigge-
ring control is activated when the flash-ready signal in the camera’s viewfinder
is extinguished. In this event no flash is fired when the camera’s shutter is trip-
ped.
On various cameras the triggering control only works in the Program “P” Mode
and in the Shutter Priority Mode “S” (see operating instructions for the camera).
The triggering control can be deactivated on some camera models:
• To do so, press and hold down the flash button
on the camera during
shooting (see camera manual).
The flash-ready signal will again be displayed in the camera’s viewfinder when
the shutter release is lightly touched. The camera selects a suitable shutter
speed/aperture combination and a flash is fired when a picture is shot.
709 47 0202.A3 50AF-1 S 17.12.2010 13:27 Uhr Seite 95