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In the flash setup mode is the option to set a front or rear curtain shutter.
Front Curtain Sync - is the normal flash mode, with the flash being fired
near the start of the shutter opening. The flash finishes quick, and
freezes the motion, and then the slow shutter remains open longer, and
can blur due to the continuous ambient light, So the ambient blur
appears later (out in front of where the flash fired), appearing to lead the
motion. Not a natural look (when there is blurring from the ambient).
Rear Curtain Sync - waits to fire the flash until almost the end of the
shutter duration, so that the ambient shutter blur occurs first, which then
appears to follow the subject (appears back where it previously used to
be, before the flash), which looks more natural to the motion.
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