I've been experimenting for an hour or more trying to balance the 5DM3 with 24-105 lens in the tilt axis. I've locked the roll axis horizontally using a lab clamp so that it's not a factor in my experiments. My mental model is that the potentiometer on the left hand side as you look at the gimbal from the front forms a "tilt axis" with the shaft/pulley on the right hand side. As far as I can tell, the CoG of the camera + lens is above the tilt axis line when the camera/lens is horizontal. Thus, while I can get the camera to balance horizontally (with its CoG right above the tilt axis), the moment I tilt the camera/lens slightly forward the CoG rotates around the tilt axis and comes forward of the tilt axis and the camera/lens nose dives. Similarly, if I tilt the camera/lens back, the CoG now rotates above and behind the tilt axis and the camera/lens tail dives. Unless I can get the CoG of camera/lens to be co-located right on the tilt axis, it doesn't appear that is any way I can achieve a stable balance in tilt at all camera/lens tilt angles -- the physics doesn't seem to work. To bring the camera/lens CoG onto the tilt axis, I think I need to lower the camera plate by lengthening the tilt arms (which clamp to the front transverse boom). I did try displacing the tilt arms away from the vertical towards me (looking at the gimbal from the front) and re-level the camera plate, but that *raises* the camera/lens CofG even higher above the tilt axis and brings it forward of the tilt axis (and can, of course move the camera on the plate, but while the CoG is above the tilt axis, it's not going to help). Similarly, displacing the tilt arms backwards, *raises* the camera/lens CoG even further above the tilt axis and moves it away from me. I've got a 24mm prime inbound, and when that arrives I'll try with that, but I'm concerned that that's not likely to lower the CoG of the camera/lens combo towards the camera plate and thus onto the tilt axis line. I suspect it's just likely to shift the CoG fore and aft. Am I missing something? Anyone successfully done this with the 5D Mark III? Thanks Andy.