Heavy motion blur shooting 5k. Any advice?

[Markus Rave]

We have been shooting a FF project 25fps and 1/50 sec. shutter speed and have very heavy motion blur. The scene was greenscreen where people walked across the picture for about 6 meters. Now we have is big issue with blurred pictures even with small movements of the characters and need some advice if this is a known problem with the Epic-X.

I have shot similar scenes with my Red One and have never encountered such problems.

Any help??

 

[oliver imfeld]

Was HDRX on or off ?

 

[Uli Plank]

Did you shoot the same exposure time before? It looks normal to me if she's walking fast.

 

[Markus Rave]

HDRx was off. I shot at the same exposure before and the blur was definetely less on my Red One using 1/50th. Altogether it even look out of focus in motion but is not.

 

[Matt Ryan]

Yeah that doesnt look right for typical motion blur. Its almost like open shutter footage. Are you sure you were shooting 25fps and at 1/50 shutter? Dumb question i know but that definitely doesn't look like normal motion blur.

Also what was your compression ratio?

Her left leg looks like the only thing sharp from this image.

 

[Jens Jakob Thorsen]

Looks like 1/25...If you can upload a short clip it will be much easier to guess...

 

[Markus Rave]

Ir definetely was 1/50th. I have imported the clips into FCP and now it also shows jitter no matter in what speed the talent walks. Compression ratio was standard 8:1. Will make a small clip and try to upload.

 

[Markus Rave]

This is what came out:

 

[Vinit Borrison]

Curious if there are any updates to this problem. Did shooting in 4k help the issue? Was anyone able to test?

 

[Markus Rave]

Nothing helped. I tried it all.

 

[Patrick Grossien]

Maybe you should open up a support ticket and see what their take on it is. Support is not only about cameras being broken...

 

[Sami Sinervä]

Ir definetely was 1/50th. I have imported the clips into FCP and now it also shows jitter no matter in what speed the talent walks. Compression ratio was standard 8:1. Will make a small clip and try to upload.

Regarding the jitter, did you have the correct timebase? Just speculating.

 

[Milan Spasic]

If the subject is moving through a still frame, to me, this is clearly a normal slow shutter effect. Have you tried different shutter speeds?

 

[Mark Toia]

Just a note: 50th a sec in a RED ONE is identical to the EPIC's 50th... impossible to be any different.

Plus, just so you know, we shoot green screen on almost every job we do, we always always get motion blur at 50th of a sec of a persona walking... . same with film cameras, same with any camera.. . 50th is still a slow speed rate, even for walking.
If you want sharper keys, shot at 90 degrees or 100th...