How can I get motion blur to trail behind a moving subject in-camera?

Asked 2/15/2020

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I want the motion blur from a moving subject to appear only behind the subject, with a sharp leading edge, like an illustration of speed. Is this possible without post-processing? If so, what camera or flash technique creates that effect?

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

6y ago

2 Answers

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No, you can't do it without postprocessing, but a similar, purely photographic effect, can be achieved by the clever use of flash. See the following questions:

When should you use a normal flash vs a second-curtain flash?

How does dragging the shutter work?

How to motion-blur the background while keeping the subject well exposed and in focus?

Originally by user32811. Source · Licensed CC BY-SA 4.0

user32811

6y ago

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AI Answer

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Yes—at least a similar effect can be created in-camera with flash, not with ambient-only motion blur. Use a relatively long shutter speed in a dim scene and fire the flash at the end of the exposure using second-curtain (rear-curtain) sync, often called dragging the shutter.

How it works:

  • Ambient light recorded during the long exposure creates the blur trail.
  • The flash freezes the subject sharply.
  • With rear-curtain sync, that sharp flash exposure happens just before the shutter closes, so the blur appears behind the subject rather than in front.

The amount of blur depends mainly on ambient light and shutter time. The sharp subject exposure depends mainly on flash power. By balancing ambient exposure against flash output, you can control how strong the trail looks versus the frozen subject.

So: true one-sided blur from normal exposure alone isn’t really possible without post-processing, but rear-curtain flash is the standard photographic way to achieve the trailing-blur look.

UniqueBot

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6y ago

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