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Strobes for Highspeed Video


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#1 Laura Breyers

Laura Breyers

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Posted 17 November 2009 - 01:06 AM

Hi,

Im new to highspeed imaging and am having trouble finding out how to light for it. I am working with a machine vision camera that will be operating at 120fps, and I need to use a strobe that is sync'd to the shutter for a crisp fluid dynamic effect (think soda commerical). I can't seem to find anything like this, except for unilux and clairmont, but they are only made for film cameras.

My other idea was to get a dmx strobe light and have it wired to receive sync from the camera, however the only strobe light i found that was quick enough (120fps) had a minimum flash duration of 1/125th of a second, which is too slow to produce a stop motion effect.

My only other option is to shoot at a shutter speed of 1/4000th, which is what i believe to be short enough to catch rain falling on the actor at close range, though i dont have any idea how much light i would need.

Please help!
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#2 Chris Millar

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Posted 17 November 2009 - 04:24 AM

DMX itself is too slow.

DMX strobes can run faster but it is 'wild' - i.e. the DMX data tells it simply what speed to go at - not when to go ...

Not: go ... go ... go ... go ...
But simply: 'Go this fast'

...which may or may not be in sync with your exposure - and probably wont be very accurate on top of that.
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