Why does the photographer look at the small viewfinder with his eyes instead of the LCD one?

In fact, the purpose of replacing LCD screen with viewfinder is to reduce the vibration of machine and hand-held camera. You can do an experiment. When using LCD screen to watch, your arms are suspended, which will inevitably lead to vertical and horizontal jitter, resulting in a weak picture. When using the viewfinder, keep your arms close to your body. If you hold your breath when you press the shutter, your hands and eyes actually form a three-dimensional triangle. At this time, the vibration of the camera has the least influence on the picture, so professional SLR cameras use viewfinder instead of LCD screen.

Some SLR cameras can use LCD to view scenes, which is said to be a selling point in advertisements. In fact, this function is a chicken rib for professional photographers who require high-quality pictures, just fooling consumers.