Flash Synchronisation; Normal Synchronisation; Second Curtain Synchronisation (2Nd Curtain, Slow2); Slow Synchronisation / Slow - Metz 58 AF-1 digital Bedienungsanleitung

Automatic adjustment of the flash range indication
The cameras transfer the flash parameters (e.g. lighting sensitivity ISO, lens
focal length, aperture and exposure correction) to the flash unit. The flash unit
automatically adjusts its settings accordingly. The maximum flash range is calcu-
lated from the flash parameters and the guide number and indicated on the
display.
This requires an exchange of data between camera and flash unit, effected for
example by tapping the shutter release.

15 Flash synchronisation

15.1 Normal synchronisation

In normal synchronisation the flash unit is triggered at the beginning of the shut-
ter time (first curtain synchronisation). Normal synchronisation is the standard
mode on all cameras. It is suitable for most flash shots.
The camera, depending on the mode being used, is
switched to the flash sync speed. Speeds between
1/30 sec. and 1/125 sec. are customary (see the
camera's operating instructions). No settings are
necessary on the flash unit, nor is there any display
for this mode.

15.2 Second curtain synchronisation (2nd curtain, SLOW2)

Some cameras offer the option of second-curtain synchronisation (2nd curtain
mode), in which the flash unit is not triggered until the end of the exposure
time.
This is particularly advantageous when used with slow
shutter speeds (slower than 1/30 sec.) and moving
subjects that have their own source of light. With
second-curtain synchronisation, a moving light source
will trail a light streak instead of building one up ahe-
ad of itself, as it does when the flash is synchronised
with the first shutter curtain.
Second-curtain synchronisation thus produces a more „natural" image of the
photographic situation when there are moving light sources. Depending on its
operating mode, the camera sets shutter speeds slower than its sync speed.
The synchronisation of the 2nd shutter curtain is set on the camera (see the
camera's operating manual)!
Use a tripod to avoid camera shake with slow shutter speeds!

15.3 Slow synchronisation / SLOW

Various cameras feature slow flash synchronisation in certain modes. This set-
ting will give added prominence to the background at lower ambient light
levels. This is achieved by matching the shutter speed to the ambient light.
Accordingly, shutter speeds that are slower than the flash sync speed are auto-
matically adjusted by the camera. Some cameras automatically activate SLOW
synchronisation in connection with certain camera programs (e.g. „Av" apertu-
re priority, night shots program, etc.). No settings are made on the flash unit nor
is there any display for this mode.
Use a tripod to avoid camera shake with slow shutter speeds!

15.4 FP high speed synchronisation HSS

Various cameras support the automatic high speed synchronisation HSS (see
your 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. The flash unit sup-
ports high speed synchronisation in TTL (TTL HSS) and M modes (M HSS).
For physical reasons, however, HSS high speed synchronisation significantly
reduces the guide number and the maximum range of the flash unit. Therefore,
be sure to note the maximum flash range on the LC display of the flash unit.
HSS high speed synchronisation is activated automatically if a shutter speed
faster than the flash sync speed is set on the camera, whether manually or auto-
matically by the exposure program.
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