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Arri sr3 video assist

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I’m having a play with my sr3- I got this video assist camera on ebay years ago and never used it for anything, mostly because the camera is supposed to plug into an anti flicker unit that also drops the 24v power from the camera to 12v for the Sony ccd. 

basically the unit is a Sony ccd camera with a specialised interface bolted on the back which connects into the standard 12 pin Sony connector beneath.


anyway I am planning on giving it an independent 12v supply and connecting the composite out to the BNC on the back of the unit - I’ve done continuity test with my multimeter to get the pinouts - my question is.... what would I do with the composite ground? I’m going to carry the other grounds back to the battery through the seven pin Fischer - can the composite video ground go with this? Or does it wire into a coax cable? Forgive me video wiring is not my specialty and I’m only having a play around before I inevitably just buy an HD c mount camera to connect to the optics on the elbow


thanks in advance




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