Metz MECABLITZ 58 AF-2 digital Nikon - Manual (Page 141)

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18.4 Automatic FP high-speed synchronisation
Various Group E cameras (D2Hs and D200, for example) support automatic FP
high-speed synchronisation (see the camera’s operating instructions). This flash
mode makes it possible to use a flash unit even with shutter speeds that are
faster than the flash sync speed. Interesting results may be achieved in this mode
when, for example, a wide open aperture (e.g., f/2.0) is used to limit the depth
of field in portrait shots taken in very bright ambient light. The flash unit sup-
ports high-speed synchronisation in i-TTL, i-TTL-BL and M flash modes.
For physical reasons, however, FP high-speed synchronisation significantly redu-
ces the guide number and the maximum flash range. Be sure to note, therefore,
the flash range on the LC display of the flash unit. FP high-speed synchronisa-
tion is activated automatically if a shutter speed faster than the flash sync speed
is set on the camera, whether manually or automatically by the exposure pro-
gram.
Note that in the case of FP high-speed synchronisation the guide number
of the flash unit also depends on the shutter speed. The faster the shutter
speed, the lower the guide number.
Automatic FP high-speed synchronisation is set on the camera (see the 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 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 ☞
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(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 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 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 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 multi-
zone AF measuring beam ቭ 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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709 47 0159.A1 58AF-2 Ni Print 26.07.2010 14:13 Uhr Seite 141