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How does flash freeze action in the exposure and have blur too?

ylwdog

US
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ylwdog Registered since 08th Jun 2009
Fri 25-Dec-09 09:09 AM

I am new in flash... like so many

I am reading about how setting flash up for different scenarios. One thing that does not make sense is freezing action with the flash while blurring can occur in the same exposure.

I watched a great video on how the shutter curtain opens and closes on Pocket Wizard, starting around 2:20 in the video;

http://www.pocketwizard.com/...ions/tutorials/pocketwizard_controltl_optimiz/

Russ' blogger post offers an example of when you can freeze foreground subject yet get blurring in the background:

http://nikonclspracticalguide.blogspot.com/...lash-two-separate-metering.html

"Now, decrease the shutter speed to 1/10th sec and shoot again. The background will be brighter, but the subject will be the same brightness as before. Also, the subject will be sharp, but the background may also show some motion blur, because 1/10th sec is too slow to hold the camera perfectly still (unless you use a tripod). Since the flash was primary on the subject; ie, the ambient was overpowered by the flash, and the flash duration is normally faster than 1/1000 sec, the subject will be sharp with no motion blur."

How does this work, how by adding flash can you freeze motion on a subject or part of the exposure yet have blur to?

Thanks,

doug

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