Low light noise pattern

[renfield sonia]

Hi, I've found some weird noise pattern in the footage I've shot with the viper cam using filmstream mode, spetially in low light situations (haven't noticed this noise in regular light situations). I'm checking camera A footage to compare it but haven't seen this pattern up to now.

Here you have a frame I grabbed with the cinetal monitor, from the 422 output ob the OB1 recorder (with an applied color correction LUT (I have checked the DPX original files and found the same pattern there aswell)

You can see this noise on the bottom left part of the frame.

Anyone has an idea if this is something to expect from this camera? We're also using magenta filters.

http://www.flickr.com/photos/68649141@N00/5100814058/