Optical slave multiple flash.
With optical slaves you position your various flashes - big AC-powered studio flash units or small battery-powered units - around the scene and connect tiny optical sensors to each one.
Sometimes studio strobes, especially if you're using a few lashed together with optical slaves and a fast 1/500 sync, are slow enough to require a slower sync speed (like 1/250 or 1/125) to capture all the light of all the strobes.
If your camera lacks a hot shoe, you can use the pop-up flash dialed down to a bare minimum so it doesn’t add significantly to the image and optical slaves such as the Adorama Electronic Slave Unit to trigger the other lights.
A new-generation, digital-savvy, optical slave that recognizes (and ignores) preflashes. One popular unit: the Wein PN Digital Peanut Slave ($35, street). It works with any accessory flash that has a PC-cord connection.
 See also: Light, Photograph, Slave, Photography, Camera
  
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