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High speed shooting with fluo

high speed fluo

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#1 Chris Larue

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Posted 03 November 2015 - 08:49 PM

Hello everybody,

 

 

I'm on preproduction for a documentary and I need to set a greenscreen shooting light with fluo.

 

I need to be at 250 fps, 1/100 shutter speed and I look for fluo ballast for this.

 

Is anybody already experienced this ? Do I need a electronic 300Hz ballast ? Have you any advice about bulbs.

 

 

Thank you.


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#2 David Mullen ASC

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Posted 03 November 2015 - 09:08 PM

How can you get a 1/100th per frame exposure time if you are running at 250 frames a second, in other words, one frame every 1/250th of a second?  With no shutter, aka a 360 degree shutter angle, the longest possible exposure time would be 1/250th of a second.  With a 180 degree shutter angle, the exposure time is 1/500th.


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#3 Chris Larue

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Posted 04 November 2015 - 03:54 AM

My mistake David :)


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#4 Mihnea Snooker

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Posted 04 November 2015 - 05:26 AM

So you will probably need a 1000hz ballast


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#5 Robin R Probyn

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Posted 04 November 2015 - 05:55 AM

Chris

 

Have a look at this,all shot 240 fps..  4 x 4 Kino,s look to be fine at 240.. 1/250 1/500 / 1/100 all the way to 1/3000..

 

Your bigger problem might be the amount of light you,ll need at 240fps.. 10 times what you would need for 24 fps.. and narrower shutter more light..   I hope your subject is small !! 

 

http://nofilmschool....-fs700-examples


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