Directions1.Half press the release button ,to start the camera auto-focus ,let focus on the main point; then fully press the release button to take a picture.2.Locking mode ,(please set camera to continuous or BULB mode) .Fully press the release button and lock the button . It"s locked the camera to start the continuous shoot or long exposure.3.Remove locking ,let pull down the lock, then release the button.