Vivitar VIV-DF-7000, User Manual, Page: 15 / 16

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Front and Rear Curtain Synchronization
Power Save Mode
Some cameras offer the option of rear curtain synchronization (Rear mode) triggering the flash unit at
the end of the exposure time. Rear curtain synchronization is particularly advantageous when using
slow.shutter speeds (slower than 1/30 sec) or when shooting moving objects that have their own source
of light. Rear curtain synchronization gives a more realistic impression of movement because the light
streaks behind the light source instead of building up in front of it, as is the case when the flash is
synchronized with the front shutter curtain. Depending on its operation mode, the camera uses shutter
speeds slower than its sync speed
For Canon,Nikon,Sony flashes:
The camera controls front or rear-curtain synchronization, therefore no
setting is required to be done on the flash.
Note: The rear curtain synchronization is only possible on cameras with this feature. See your camera’s
instruction manual for details.
If there is no communication between this flash unit and the camera for around 3 minutes, the flash unit
will automatically be switched to power save mode in order to save battery power. The Ready light will
be off while in this mode.
To reactivate the flashgun, simply press the camera’s shutter or switch the main switch off and on
again. The flash unit is not completely switched off in power save mode. However, power consumption
is drastically reduced. If you are not going to use the flash unit for a while, we recommend you to turn it
off.