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Old June 1st, 2015, 06:26 PM   #1
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Join Date: May 2015
Location: Carnegie
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GH4 problem with motion blur and stuttering vision

Hi folks,

I need some advice.

I recently shot a courtroom on my GH4. I needed a long roll (90 minutes plus) so I used the Panasonic 64gb card and set the camera to:

FHD 50 MBS

1920 x 1080 - 25p

Shutter speed 1/50

This is the problem. At the start, using mostly available light, everything looks fine. When people move in the frame it looks normal. But then we turned on 2 x 1k lights and things got weird. The vision becomes quite stuttering and people blur when they walk through frame.

Heres the vision :

I'm a bit baffled. My initial thought is that 50 mbps may have been too low a rate to allow the camera to write all the info, but I have no scientific basis for believing that. Otherwise, I'm at a loss to know what I did wrong to get that result.

Any advice is much appreciated!

Craig
Craig Saunders is offline   Reply With Quote
Old June 1st, 2015, 08:35 PM   #2
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Join Date: Mar 2011
Location: Salt Lake City, Utah
Posts: 65
Re: GH4 problem with motion blur and stuttering vision

Are the two different clips in the same file? I almost looks like it's shooting 15 frames per second at a really slow shutter in the second part. I've never seen anything like that with LED panels and my GH4 at 1080-60p or 4K UHD 30p.

Cheers,
Pete
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Old June 1st, 2015, 09:37 PM   #3
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Re: GH4 problem with motion blur and stuttering vision

It looks like you accidentally adjusted the shutter when trying to adjust the iris to compensate for the new lighting.
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Old June 2nd, 2015, 01:59 AM   #4
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Re: GH4 problem with motion blur and stuttering vision

If you look in the motion picture menu, what setting is the exposure mode set to?
Noa Put is offline   Reply
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