Quote Originally Posted by Ole
Short of putting the ball head directly on the ground, or dispensing with the tripod and head altogether, I can't really imagine a way to get a LF camera much closer to ground level...
Ole, I hang my Graphics upside down from an inverted center post. This lets me put the top of the camera at ground level, i.e., in contact with the soil. With full rise, I get the lens' axis fairly close to the soil too.

Please understand that working this way isn't easy. In fact it is somewhat painful, especially on rocky ground. Working this low with a Nikon is a little harder.