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HSS TECHNOLOGY - HIGH SPEED SYNCH
High-speed sync flash is the camera's ability to use a flash at shutter speeds faster than the camera’s native sync.
Most cameras have a native sync of 1/250th of a second, and anything faster than that is beyond the camera’s ability to sync the shutter with the flash. But if you happen to be in a situation that requires faster shutter speeds to effectively capture the action, or for other aesthetic reasons (like a wide aperture), then you’ll over-exposure your image.
However, high-speed sync flash/camera combinations allow you to use the flash at higher shutter speeds.