Flash units are commonly built directly into a camera. Some cameras allow separate flash units to be mounted via a standardized "accessory mount" bracket (a [http://en.wikipedia.org/wiki/Hot_shoe hot shoe]). In professional studio equipment, flashes may be large, standalone units, or studio strobes, powered by special battery packs or connected to [http://en.wikipedia.org/wiki/Mains_power mains power]. They are either [[synchronized]] with the camera using a flash synchronization cable or [[radio]] signal, or are light-triggered, meaning that only one flash unit needs to be synchronized with the camera, and in turn triggers the other units, called ''slaves''.[http://en.wikipedia.org/wiki/Flash_(photography)] | Flash units are commonly built directly into a camera. Some cameras allow separate flash units to be mounted via a standardized "accessory mount" bracket (a [http://en.wikipedia.org/wiki/Hot_shoe hot shoe]). In professional studio equipment, flashes may be large, standalone units, or studio strobes, powered by special battery packs or connected to [http://en.wikipedia.org/wiki/Mains_power mains power]. They are either [[synchronized]] with the camera using a flash synchronization cable or [[radio]] signal, or are light-triggered, meaning that only one flash unit needs to be synchronized with the camera, and in turn triggers the other units, called ''slaves''.[http://en.wikipedia.org/wiki/Flash_(photography)] |