High speed shooting with fluo

[Chris Larue]

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.

[David Mullen ASC]

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.

[Chris Larue]

My mistake David :)

[Mihnea Snooker]

So you will probably need a 1000hz ballast

[Robin R Probyn]

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.com/2012/07/shooting-slow-motion-fs700-examples