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Lightning Strikes on the Red


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#1 Jayson Crothers

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Posted 02 September 2009 - 01:14 PM

I'm about to start shooting a 2 camera RED feature and there's a night exterior scene with lightning. I'm trying to arrange for some Lightning Strikes units, but a colleague recently shot a music video on a Red with a 70K Lightning Strikes and had problems with the rolling shutter only capturing the flashes on parts of the frame (for example, there would be a horizontal bar at the top and bottom of the frame that showed the flash, but not the middle).

Is it possible to adjust the Lightning Strikes to flash a bit longer, sync with the cameras (and how time consuming is that?), etc?

It's either this is a 12K with metal shutters........
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#2 John Sprung

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Posted 02 September 2009 - 06:50 PM

I doubt that they can adjust the duration on those arc tubes. Even if they can, it's the ultra fast rise/fall times that are the problem, the light goes on or off while the rolling edge is in frame.

Test the metal shutter idea. If the rise/fall times are still too fast for the rolling shutter, then shoot without the effect, and fake it in post. It's actually easier to fake the whole lightning flash than to fix frames that are part flash and part dark. Given that things'll be very dark, it helps to also shoot a reference of a few seconds on each setup exposed bright enough to help with the post faking.




-- J.S.
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#3 John Brawley

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Posted 03 September 2009 - 12:57 AM

Is it possible to adjust the Lightning Strikes to flash a bit longer, sync with the cameras (and how time consuming is that?), etc?

It's either this is a 12K with metal shutters........


Yes you can but not in a way that will address the inherent rolling shutter issue of the RED. Go for the 12K if you don't like the artefact.

jb
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#4 Patrick Neary

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Posted 03 September 2009 - 08:35 AM

Hi-

what about using those huge medium-base flash bulbs? Not super convenient for lots of multiple flashes, but long burn time and huge output.
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#5 James West

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Posted 13 October 2009 - 05:46 PM

Jayson, saw your thread, what did you wind up doing, and how did it turn out in your opinion?
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#6 Jayson Crothers

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Posted 14 October 2009 - 07:42 PM

I ended up using metal shutters on a 12K HMI Fresnel and a 4K HMI Fresnel (would have liked a 6K or another 12K, but the budget was cut at the last minute).

It took a little bit of trial and error to find the right timing, but once we did it looked fantastic.
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