The 15.75" TSR-40 Threaded Shutter Release Cable from Vello is a standard cable release that is compatible with mechanical film cameras or digital cameras with a threaded shutter release button. The disc-lock enables you to do long exposures or bulb mode without putting your hands on the camera while it is mounted on a tripod, so it minimizes camera shake. The shutter release cable is flexible and wrapped in a durable, weather-resistant vinyl cover.