The VZPG-C20 pistol-grip zoom control for the Canon CN-E 18-80mm and CN-E 70-200mm servo lenses provides remote zoom, record and One-Shot Autofocus, along with a unique offset swivel clamp for adjusting the angle of operation. The pistol-grip design allows left- or right-handed operation. The PG-C20 features a dual-variable system for versatile, precise control of zoom speed. Set the maximum desired speed on the dial (located in a trigger position), then use the pressure-sensitive rocker to vary the speed from a crawl all the way up to the preset max. Alternatively, depress the rocker fully and roll the dial with your index finger to ramp the speed up.