This sounds like an all-to-common situation to me. Just to get this clear, if you unplug the HDMI cable from the camera, does the tingle go away? If so, you'll probably find you now get a tingle from the metal shield of the HDMI cable itself. (As far as this is problem is concerned BNC = HDMI since the exposed metal part is simply the ground connection on both types of cable).
If you now are getting a tingle from the HDMI cable it means your monitor is not grounded. Does your SyncMaster have a two-pin or 3-pin AC connector? (There are hundreds of Web pages that talk about the SyncMaster, but none of them specifically mentions this, but it looks like the standard 3-pin like you get with computer monitors).
If your SyncMaster has a three pin AC lead, then it's not being plugged into a grounded socket. The tingle you are feeling is most likely caused by what's known as a "touch current" and is caused by capacitive leakage between the AC input and the exposed metal parts. It won't hurt YOU, but it can very easily kill sensitive electronic devices such as HDMI interface drivers. You must always turn the monitor off before re-connecting the HDMI lead.
Why is it not grounded? Some possibilities:
• You are running from an ungrounded generator system
• You are plugged into a AC socket that does not have a ground connection
• You are using an AC distribution board which at some point some A$$hole has cut the ground pin off its AC lead (or cut the green wire) to try to solve some sort of ground loop problem.
If everything is grounded properly, with a VOM set to the “Ohms” range, and the AC power switched off, you should not measure any more than 10 ohms or so between the metal shield of the HDMI lead plugged into the SyncMaster and any cold water pipe you can find. (Assuming they don’t have plastic pipes, which I wouldn’t think too likely in a place like that!)