A flash unit is said to be a slave flash when it is set up to fire by detecting the flash from another (master) flash unit in a multi-light setup. This allows multiple light setups to be operated with only one light synchronized (wired) to the camera. As many slaves as necessary can be used in a set-up. All studio flash units from Paul C. Buff Inc. have highly sensitive built-in slaves which can be disabled if desired.


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