Outstanding. I want to parent a camera to a "ring light" (read mesh light) for use in Reality/Lux. The camera needs to be at 0,0,0 so that the prop is in the correct position, I've never tried to "zero" a light and I'm not sure how to get it into the required position. There doesn't seem to be any Translation controls for the cameras.

The dolly camera DollyX, DollyY, and DollyZ are precisely the position of the dolly camera viewpoint. The same holds true for any dolly camera you would make. Orbiter cameras also have those parameters, but they move a reference point that the camera is looking at (note - this is not the orbit center).

However, I think you may be looking at this the wrong way. It makes as much sense to parent the mesh light to the camera instead of the camera to the mesh light. In which case I have no idea what use you have for the Poser light in this situation. But if you want a Poser light as well as the prop mesh light, then parent the poser light to the camera, too.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)