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Personally I'd rather have a leveling base and use the panning base on my ball head. This set up allows the horizon to be placed around the frame rather than in the middle every time. As you point the camera down though, the lens will move farther forward and you'll need a longer rail. As you tilt the camera up you won't need as much rail, so it's helpful to be able to move the clamp position on the rail to keep it out of the frame on WA shots. My rail is from Hejnar Photo. It was just fine and he was great to work with.