Emgreat LCD Timer Shutter Release Remote Control Selfie Timer Remote Control Shutter Release Cable for Canon 5D3 5D2 7D 6D 5D 50D 40D 30D 20D This RS-80N3 remote shutter release can eliminates hand trembles when shooting with camera and get sharper pictures. It helps preventing vibration during long exposures (time-lapse photography), Close-Up (Macro photography) or Continuous shooting. You can trigger the shutter without touching the camera body. Shutter release button with lock - for long exposures shooting and continuous shooting Halfway pressed button - for auto-focus and exposure metering