The AquaTech Pistol Grip with Shutter Release makes it easy to control your Aqua Tech Sport Housing when in the water. Just attach the housing to the pistol grip with the included hardware and jump in. You can fire the shutter with the included shutter release, but it will not activate the camera's focus lock function. When using the pistol grip, zone focus will produce sharper, more consistent images. A water proof bulkhead for Canon cameras is included. This pistol Grip is compatible with the DV-4, D-35, DC-5 (not compatible with DC-5 v2), ND-3, ND-7 and NB-300s Aqua Tech Sport Housings.