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Silvy Cynder
shooting in low light
on Aug 24, 2011 at 12:43:16 am

When shooting in very low light and your lens is wide open and the video still looks dark, is it better to pump up the ISO and risk some grain or slow down the shutter and risk getting those warpy lines that make it look like you were shooting in a heat wave?


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Peter Burger
Re: shooting in low light
on Aug 24, 2011 at 9:30:05 am

Well, I'd rather push ISO and do noise reduction in post than have to deal with "ghosting". But that's purely a matter of personal taste and/or your skills in post-production...

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"Tragedy is a close-up; comedy, a long shot." - Buster Keaton


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Peter Burger
Re: shooting in low light
on Aug 24, 2011 at 1:55:26 pm

To add: noise can be tackled with various noise removing plugins, "ghosting" is something that you can't remove successfully...

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"Tragedy is a close-up; comedy, a long shot." - Buster Keaton


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Silvy Cynder
Re: shooting in low light
on Aug 25, 2011 at 1:42:28 am

So what exactly causes ghosting? Or how best to avoid it I should ask... Thanks Peter!


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Peter Burger
Re: shooting in low light
on Aug 25, 2011 at 10:18:57 pm

"Ghosting" is exactly what you described with "warpy lines that make it look like you were shooting in a heat wave" and is caused by slow shutterspeeds.
A general rule of thumb in video is to use shutterspeeds about twice as high as the framerate your shooting. With 24 and 25 fps it's a shutterspeed of 50, with 30 fps it's 60 and so on...
If you're going higher you risk strobing, if you're going lower your risking ghosting

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"Tragedy is a close-up; comedy, a long shot." - Buster Keaton


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Silvy Cynder
Re: shooting in low light
on Aug 26, 2011 at 4:24:39 pm

That's what I suspected... Thank you for your helpful feedback Peter!


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Peter Burger
Re: shooting in low light
on Aug 26, 2011 at 7:00:05 pm

You're welcome, Silvy! Glad I helped!

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"Tragedy is a close-up; comedy, a long shot." - Buster Keaton


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Silvy Cynder
Re: shooting in low light
on Aug 28, 2011 at 4:37:39 pm

Peter any suggestions for treating footage with ghosting or strobing in post?


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Peter Burger
Re: shooting in low light
on Aug 28, 2011 at 6:34:04 pm

There's not much you can do about that... At least I don't know anything. Sorry!

------------------------------------------
"Tragedy is a close-up; comedy, a long shot." - Buster Keaton


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