Horizontal ripping lines when panning on 5dmk11

Any advice welcome please. I am getting horizontal "tears/ripping" lines across the screen when panning even really slowly.
The c/f cards are very fast writing.I am using about 50 th sec and recording 24fps full h/d.

I am also seeing marks like bad dust bunnies on the film even though they don't show up as bad on photos taken at the same time.
I will go back to some of my older recordings as i don't think it was as bad then as now.
Thanks

Can you post up an example of what you are talking about? Always easier to give clear opinions when people get to see what you are actually talking about rather than relying on an assumption they understand what you are describing.

Hi ,i have just put this on you tube so give it a while.I know this is fast panning and subject matter BUT it does it on slow panning and sometimes vertical movements as well. You can also see the 2 marks that show up on the video much clearer than they show up on photos taken at the same time. https://www.youtube.co​m …N_dNDEHE&featur​e=youtu.be

Here is a slower vehicle but you will see the lines even better breaking up on the paintwork.
https://www.youtube.co​m …Cz56cRgQ&featur​e=youtu.be

Hope this helps --Thanks

What you are experiencing is rolling shutter (the tearing) and moire (the breaking up on the paintwork) both of which are HUGE downsides to DSLR video.

Thank you for the answer.I guess i will have to accept it's limitations but still an excellent camera ,Thank you

An explanation of "Rolling shutter" would help... Rolling shutter is when you pan the camera faster than the "Scan" of the censor. Think of it as the digital equiv of motion blur in a long exposure. Film blurs... Video Shutters. Slower pans will help. Some cameras have higher shutter speeds to compensate. That means more dinero.

Would higher shutter speeds help in this regard? Max i could get away with is probably 250th sec.