Banding/Stripes on the raw file.

[BW]

I shot this picture with a flash tonight. Shutter speed was 1/8000th of a second and the lens was the Nikkor O 35 mm. It was shot at f2,8. The camera was the D4s. It was a Strobies flash with Godox trigger. I have never noticed anything like this before, and my best guess is that the camera was in live view mode while I took the pictures. Could this be the case? Please enlighten me if anyone else has any plausible ideas.

[Bjørn Rørslett]

More likely the high-speed flash functionality showing its inadequacy.

[BW]

Have used it many times and never noticed it before. I have to test it again tomorrow, without the live view engaged. I bonced the flash off the roof and there was another light source involved, a led light. It wouldnt be strong enough to contribute to the exposure, but it might account for the flickering??

[Bjørn Rørslett]

Only elimination experiments can tell for sure.

[charlie]

Freezing motion in this manor is typically done by the flash duration of the strobe you're using, not the camera shutter speed, I assume this is why you had it set to 1/8000s? Make sure no ambient light is making its way into the exposure and try this again at 1/250th to see if there is any difference in motion blur.

I would expect the flash you are using the have the shortest duration at the lowest power setting. 

[BW]

I will check it again tomorrow and try the elimination method. I was hoping to avoid reading the manual, but it seem I have swallow the bitter pill Charlie

[Akira]

If the shutter speed was 1/8000, the flash should have been in FP mode.  In such a mode, a flash is usually lighting in the fast pulsating manner and not continuously.  In addition, which the slit of the shutter set at 1/8000 is very narrow.  So, the lighting (exposure) may not necessarily be consistent according to the moment the slit passed each area.

[BW]

I think your explanation might account for the observed effect, Akira.