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

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

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.

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?