On the mulitcamera Red Epic stage shoot I've been helping on they finally brought in a Resolve Colorist and we found that there appears to be a 60 Hz like hum line traveling from top to bottom in multiple cameras all Red Epics. A ground loop was suggested by the colorist. This was a multicam shoot with external Pix recorders for the offline media that turned out to be 2 frames off, but that's another story. I'm curious how a ground loop/floating ground could effect the internal Red feed from the sensor to the Raw file. Is the ground loop actually effecting the sensor itself which then feeds into the Raw file. The line is thinner that a typical 60 hum bar but it is a horizontal line that brightens up the picture as it passes through. It's mostly noticeable on medium grey pillars in the back ground. We see it in multiple cameras. It sounds like there a plenty of ground loop sources with external Pix recorder and feeds to director's monitors
etc... If it's not a floating ground I'm wondering it maybe some new LED style lights might have been used or some other new exotic lighting source that might have created the problem. Anybody seen anything like this?
John Moore
Barking Trout Productions
Studio City, CA
bigfish@pacbell.net
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