Bolt VS-570SMI Wireless TTL Flash for Cameras User Manual
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Using the VS-570 as a Wireless Master or Slave
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remote flash units. You can use this option to prevent your remote units from being triggered by the master
unit of another photographer working with the same type of system nearby.
Groups:
With the VS-570’s wireless system, you can assign remote flash units to either of two groups (A or B)
and set the mode and power ratio for each group, as well as the master.