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Flash units normally fire when the first shutter curtain is fully open. Since the time lag between pressing the shutter button and firing the flash is extremely short, this method is ideal for seizing fleeting shutter opportunities. However, any movements of light sources after the flash fires and before the exposure ends are also recorded in the image. This can be a problem at slow shutter speeds.
With EX Series Speedlites, photographers have the option of firing the flash right before the second shutter curtain begins moving. This second curtain sync flash function captures moving light sources before the main subject, resulting in images that convey a more natural sense of movement. |
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