The basic knowledge of photography teaches you how to lock the focus with a camera.

If the subject is not in the middle of the screen when the shutter release button is pressed, the subject will be out of focus because the camera will automatically set the focus and exposure for the subject in the middle of the screen. If you want to focus and expose objects that are not in the middle of the picture correctly, you need to use the "focus lock", which is a system that tells the camera where to focus.

1. Use Focus Lock

First, put the subject in the middle of the viewfinder. Then press the shutter button halfway to lock the focus on the subject. When you press this button, you will hear a click or see the focus indicator (usually a green dot) on the LCD screen light up.

When the finger remains in this position, press the shutter button halfway to lock the focus.

Hold down half the shutter and reposition the subject so that it is not in the middle of the LCD. Be careful when redrawing, neither you nor the subject will leave the original position. Finally, press the shutter button completely to take a picture. By locking the focus first, the subject can focus correctly even if it is not in the middle. Since you won't just shoot the image of the middle subject, please practice this technique, so that you can compose the composition at will and focus the subject correctly in the future.

Photos taken without focus lock function.

Put the subject in the middle and press the shutter button half-way, focus the subject and re-compose, and then press the shutter button completely to take pictures.