How to do strobe effect? Urgent!

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There may be other ways, but I believe you will need a remote setup with manual test flash button.

If it were me, I would setup for the shot, test lighting positions, then alter shutter to open for a second or two, alter aperture to expose correctly (trial and error unless someone knows how to calculate for multiple flashes?)

I would then take remote in hand, engage shutter and manually fire number of flashes to suit...
 
So the best way may be to set up a couple of flashes, expose for 1-2 seconds and just press the test button a few times quickly on my Pocket Wizard transmitter? I was hoping that it's a custom function on the flash to keep firing whilst the shutter is open?
 
Here you go. Link

You really need to eliminate as much ambient light as possible.
 
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Dave that's exactly it, cheers. Thanks Andy as well. Let's hope I get enough time to trial and error to get a nice result!
 
Yup stroboscopic mode, the only Canon flash which can do it is the 580EX II I believe. Press the mode button until it shows MULTI in the top left.

Then you need to set frequency and count. Example: in M mode set your exposure to 1sec, aperture and shutter speed at whatever. Set the flash frequency to 1/10 and count to 6, take the shot :)

You will end up with 6 flashes, one every tenth of a second.
 
580EX has strobe/multi mode. That bit is easy - see handbook.

More difficult, assuming there is some ambient light about, is to try and capture the moving subject against a dark part of the background.

In the link posted above, notice how the flash images are much more clear against darker areas.
 
Ah yes maybe so. I forgot to mention you need to manually set the flash power too as there's no ETTL in stroboscopic mode.
 
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