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12 Automatic AF measuring beam
The automatic AF measuring beam
ቭ
is activated in the flash unit by the 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 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 bet-
ween lens and AF measuring beam limits the close-up range with the AF measu-
ring 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 automatic
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!
13 Triggering control (auto-flash)
On some cameras the flash will not be fired when the prevailing light is sufficient
for an exposure. When the camera shutter release is depressed, no flash exposu-
re is triggered.
In various cameras the triggering control only works in the full program mode or
„P“ program or must be activated on the camera (see camera operating instruc-
tions).
☞
14 Care and maintenance
Remove dust and grime with a soft dry cloth or silicon-treated cloth. Do not use
cleaning agents as these may damage the plastic parts.
14.1 Firmware updates
The flash unit’s firmware can be updated through the USB port
ቯ
and adjusted
to the technical requirements of future cameras (Firmware Update).
For more information, visit the Metz homepage at www.metz.de.
14.2 Reset
The flash unit can be reset to the factory settings when delivered. Press the
ìModeî button for ca. 5 seconds. After ca. 5 seconds „rES“ (= Reset) is shown in
the display and the flash unit is reset to the settings as delivered..
This will not affect the firmware updates for the flash unit.
14.3 Flash capacitor forming
The flash capacitor built into the flash unit undergoes physical change if the unit
is not switched on for a prolonged period. For this reason it is necessary to
switch the unit on for approximately 10 minutes at least once every three months.
The power supplied by the power source must be sufficient to cause the flash
readiness indicator to light up no more than one minute after the flash unit is
switched on.
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707 47 0065.A1-48AF-1O Inh. 17.09.2007 13:58 Uhr Seite 76