I want to be able to hook up a head to a dolly or slider, and move it while sliding as well. But not just any head. Are they any that can almost somersault the camera on any axis? It doesn't have to go over 180, but has to go at least 180 degrees. Starting on a vertical axis, then rotating to a horizontal axis, in the process? Kind of like a ball that can rotate any which way possible accept not for too far down and around, or you will see the tripod or dolly of course.
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