Varizoom VZROCK-J600 New Lens Control for JVC GY-HM 600 and GY-HM 650 (Black) this unit offers the finest degree of control and a complete feature set. With its wide-sweep zoom rocker, the VZ-Rock-J600 combines the attributes of broadcast controls with a compact, affordable design. "On" button for toggling camera between Auto and Manual Iris modes Low profile record/pause button