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High-speed lighting


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#1 Paul Tackett

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Posted 29 January 2018 - 04:22 PM

Hello I'm lighting for 1000 fps. In the equation I originally compensated for shutter speed but I believe the following is now correct using shutter angle if you could please help if you know.

I used the equation: 100asa at 180degree shutter, 24fps = 100fc at 2.8

For high speed I got: 800iso, 180degree, 998.4fps = 520fc at 2.8

Do I need to compensate for shutter or is this correct? Thank you
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#2 Paul Tackett

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Posted 29 January 2018 - 04:25 PM

With this in mind a 12k Big EyeSolorspot at full spot at 20 is 5900fc & 950fc full flood. Factor in diffusion cutting at least by half I'm thinking I could probably do medium spot and have exposure with one unit on the back edge
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#3 David Mullen ASC

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Posted 29 January 2018 - 04:54 PM

1000 fps is something like a 5+ stop loss compared to 24 fps, and going from 100 ISO to 800 ISO is a 3-stop gain, so you need another 2-stops of exposure, so a bit more than 400 fc instead of 100 fc? So your 520 fc might be right, off the top of my head...
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#4 Paul Tackett

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Posted 30 January 2018 - 11:11 AM

I appreciate it, thank you David for all your help.


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#5 Paul Tackett

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Posted 30 January 2018 - 04:05 PM

Another question regarding this. Can a skypanel with the 3.0 update shoot flicker free at 1000 fps? Considering using a couple s60's and getting more top down light.


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#6 David Mullen ASC

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Posted 30 January 2018 - 04:37 PM

http://www.arri.com/...s-new-features/

Looks like youll be fine. Dont know what the speed limitation was before. An older post suggests that the pre-3.0 upgrade was flicker-free at 2400 fps.
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#7 Paul Tackett

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Posted 30 January 2018 - 05:15 PM

Thank you David. Thats pretty high, great to know!
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