On my macro video compact rig, I started out super negative (-1.5kg) but are now currently only a little negative.   That said, I use a quadripod, not a tripod, and the rig is really stable, even when close to being neutrally buoyant.   Buoyancy varies with the diopters I use (Inon UCL165, AOI-09, CMC-1 or stacked combinations of these), but I love it like this.   When i started out really negative, the legs would dig deep into the fine vocanic sand we have here in eas
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