Light flashes from Motion Mount?

[John Barrett]

I shot a music video last week, and finally got around to checking the footage and noticed flashes of light in a few of the shots. It looks like the RED PL Motion Mount was glitching and causing the flashes of moments without ND. Have you guys seen this before? Can I fix it in post? Why did this happen and how can I stop this from happening again? Thanks in advance!
Shot on RED SW - Motion PL - Leica Summircron-C - 4K HD 120fps - 180 degrees - Good black shade

https://youtu.be/0QzV93-j06k

 

[Paul Watt]

I've seen it in cold temperatures. My fix for that situation is to tape heat pads to the outside of the mount and put a Barney and plastic bag on the cam. Was it cold on the shoot?

 

[Paul Watt]

I see from the vid it looks pretty warm. I've had other issues because of corrosion on the mount contacts. Cleaning them made the issue go away. Worth a try.

 

[John Barrett]

I see from the vid it looks pretty warm. I've had other issues because of corrosion on the mount contacts. Cleaning them made the issue go away. Worth a try.

Yes, it was warm. Very strange glitch. Will clean contacts. Thank you.

 

[Dr. Sassi]

Manual states -- 109.98 fps max -- perhaps there is the problem?

 

[John Barrett]

Manual states -- 109.98 fps max -- perhaps there is the problem?

Interesting! But I think they are referring to Soft and Square shutter modes as opposed to ND only mode, which I was in.

"The MOTION MOUNT Soft and Square shutters provide improvements in temporal aliasing and motion at frame rates up 109.98 fps, but are more effective at lower frame rates. For more information, go to Soft Shutter Angle or Square Shutter Angle"

 

[John Lovell]

I have seen a similar effect in my (EF) motion mount footage shot on Dragon. Shot in 60-80 degree weather.

Subscribed and will post footage if I replicate the problem, or scrub through a problem clip.

 

[Stacey Spears]

I would trim out a segment with some frames before and after the flash and send to Red. Trim it as an R3D so they have the R3D to look at.