Bolt VS-570F Wireless TTL Flash for Cameras - Manual (Page 29)

Using Your VS-570F as a Wireless Manual Flash | 29
Setting the slave mode:
Depending on your camera and flash settings, the master flash may emit more than one burst of light in
quick succession (called a “pre-flash”). Pre-flash is used to help the camera meter and/or focus, and is done
automatically by the camera. If the slave flash is not set correctly, it may be triggered by the pre-flash and fire
before the camera’s shutter opens. In order to ensure that the VS-570F fires at the correct time, there are three
different slave modes available: modes 0, 1, and 2. To select the correct slave mode, follow these steps:
1. Make sure the flash is in slave mode.
2. Press the Up and Down buttons to cycle through the slave mode options on the LCD.
A. In mode 0, the flash will fire on the first (or only) burst of light. Use this mode when the master flash
is set to manual.
B. In modes 1 and 2, the slave will ignore either one or two pre-flashes, respectively. Use these modes
when the master flash is set to TTL or automatic modes. Whether the master emits one pre-flash or
two will depend on the camera and settings—always take a test exposure to ensure that the slave
is set correctly.
Important! Some cameras, when set to red-eye reduction, will emit a series of quick flashes lasting a second
or more. This may not work properly with any slave mode. We suggest you avoid using red-eye reduction
when using the VS-570F as a slave.