The HDC-5500V and HDC-3500V cameras come with a native variable ND filter, as well as a slide mechanism to enable use with Sony’s new viewfinders (HDVF-EL760/EL740). When used in conjunction with the HDCU-5000 camera control unit, the new HDC-5500V and HDC-3500V can be upgraded to support High Frame Rate (HFR) at up to 4x 4K and 8x HD.