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A socket on the camera used to plug-in an electronic flash gun cable so that the flash can be triggered at a distance from the camera.
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Many cameras now have a built-in flash that is used to take pictures inside when the light levels are low. Most cameras will have an Auto mode and there are usually several other modes including, Red eye reduction, Off, On, Slow sync.Most SLRs and some compacts have the option of attaching an external flash on an accessory shoe. Some have a sync socket so you can attach a studio flash off the camera for more controllable results. Buying advice: The flash range is often quoted and ones with more power will allow well-exposed pictures to be taken at greater distances. Having several modes increases the camera's versatility. If you would like to use studio flash you can fire heads remotely using your camera's built in flash and a slave unit, but watch out on digital cameras - the flash may not be synchronised correctly. It's better to use a camera with a sync socket. The most useful feature of an auto camera is Flash Off so you can avoid flash when you want to shoot in low light and Flash On to force the flash to fire to get good fill-in light in contrasty conditions.
The sync socket on a camera that triggers an attached electronic flash at the precise moment when the shutter is fully open.