Second Curtain Synchronisation (Rear); Slow Synchronisation (Slow); Automatic Af Measuring Beam; Triggering Control (Auto-Flash) - Metz MECABLITZ 50 AF-1 digital Mode D'emploi

11.3 Second curtain synchronisation (REAR)

Some cameras offer the option of second-curtain synchronisation (REAR,
2nd curtain, SLOW2), in which the flash unit is not triggered until the end of the
exposure time. This is particularly advantageous when used with lower shutter
speeds (slower than 1/30 sec.) and moving subjects
that have their own source of light. With second-cur-
tain synchronisation, a moving light source will trail a
light streak instead of building one up ahead itself, as
it does when the flash is synchronised with the first
shutter curtain. In this way a „more natural" image of
the photographic situation is produced!
The REAR mode is set on the camera (see camera's operating instructions).
There is no display for REAR mode in the flash unit.

11.4 Slow synchronisation (SLOW)

A slow exposure (SLOW) gives added prominence to the image background at
lower ambient light levels. This is achieved by adjusting the shutter speed to the
ambient light. Accordingly, shutter speeds that are slower than the flash sync
speed (e.g., shutter speeds up to 30 sec.) are automatically adjusted by the
camera. Slow synchronisation is activated automatically on some camera
models in connection with certain camera programs (e.g., a night shot pro-
gram, etc.), or it can be set on the camera (see the camera's operating instruc-
tions). No settings are necessary on the flash unit, nor is there any display for
this mode.
☞ Slow synchronisation SLOW is set on the camera (see camera's operating
instructions)! Use a tripod when shooting with slow shutter speeds to
avoid blurred images!
102

12 Automatic AF measuring beam

The automatic 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 automatic 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 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!

13 Triggering control (auto-flash)

On some cameras the flash will not be fired when the prevailing light is suffi-
cient for an exposure. When the camera shutter release is depressed, no flash
exposure 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
instructions).
is activated in the flash unit by the
is to be activated by the camera,