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ac
It's motion blur. Comes from making a slow exposure.
>>41395 Time lapse is something else. That's when you take a series of pictures over time and then make a movie of them.
>>41419 Slow-sync flash is related, but not this. It's when you combine flash with a slow shutter speed, which will give you a sharp subject where the flash hits and a motion blur in front of or behind them (depending on whether you tell it to sync the flash with the first or second shutter curtain). This particular shot is clearly not a flash shot of any kind. It's just a long exposure shot.
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