The load capacity has also been improved: the 509HD supports kit up to 28.8lb (13kg) at 55mm c.o.g and two 3/8-in. threads on the top plate allow accessories, such as monitors and arms, to be fitted straight to the head, thus eliminating the need for extra clamps, saving set-up time and freeing the video camera??s hot shoe for other components. 509HD features the ABR (Advanced Balancing Recorder)