Fluorescent Light Fixture Caused Strobing BMCC EF

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Dustin Svehlak

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Fluorescent Light Fixture Caused Strobing BMCC EF

PostSun Apr 13, 2014 10:31 pm

Hey guys, I've opened a trouble ticket with Blackmagic but am awaiting a reply. I've noticed under some fluorescent lights I see a strong flicker as well as a faint and thick, dark bar (not the bar that shows up if the image is underexposed) in my footage. I can recreate this at will at a location we've started using. At first I chalked it up to a sensor limitation but whilst shooting yesterday, I tried our BMPCC and found the issue did not occur. I know it's not the same exact sensor, but I was concerned since they are based off similar architecture that something might be wrong with my BMCC.

Anyone else experience this before? I should also mention it shows up regardless of framerate or shutter angle. ISO doesn't matter either. It's just in this lighting setting.
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Aaron Green

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Re: Fluorescent Light Fixture Caused Strobing BMCC EF

PostSun Apr 13, 2014 10:54 pm

Which light is it? I've had that problem with the westcott ice light.
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Dustin Svehlak

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Re: Fluorescent Light Fixture Caused Strobing BMCC EF

PostMon Apr 14, 2014 3:13 am

USA, 23.98 bit other framerates exhibit as well.
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David

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Re: Fluorescent Light Fixture Caused Strobing BMCC EF

PostMon Apr 14, 2014 4:38 am

By default i shoot 24 fps at 180 degree shutter angle. But I get banding from fluorescents on my bmcc when using this setting. I change the angle to 144 degrees and the banding goes away.

I dont know why and I don't ask.

But try that. 24fps and 144 degrees. Works for me.
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Dustin Svehlak

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Re: Fluorescent Light Fixture Caused Strobing BMCC EF

PostMon Apr 14, 2014 4:46 am

Next time I'm there I'll play around with it but I tried different frame rates and shutter angles and the strobing continued. I just don't understand why the Pocket is not susceptible to this same behavior.
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