Sequence viewing > Light & Lighting - Resource - © Lloyd Godman

Light in Photography -   LIGHTING -  FLASH LIGHTING


Generally only one studio flash head need be connected through the flash sync cord which is the wire cord that connects the flash to the camera, as  other units can be fired simultaneously from the pulse of light from the connected flash unit by a device often built in to the unit called a slave unit.
switch to turn the slave unit on
Slave sensor

Visual conformation function switch

(the eye shapes are icons embossed beside the functions)
Not only for studio units that do not have a built in slave unit, but for portable flash units as well,  a portable slave unit can be attached through the flash sync cord plug on the flash unit. The slave unit is a small switch that reacts to the sudden intensity of the first flash, setting of the other units and if not built into. 

A portable slave unit
The slave unit must be in a position to be receptive to the initial pulse of light or it may not fire, and some flash units have a means of checking this called visual conformation. The visual conformation feature turns off the modeling light for 1 or 2 seconds and then turns it on again. This pulse of darkness gives a clear indication the flash from the master flash head connected to the camera has reached the secondary unit and activated the flash.

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