What is the main effect of the combination of reality and photography?

Efficacy: Highlight the theme and show the theme: 1. Use large aperture and long focal length to obtain shallow depth of field and highlight the main body. 2. Using the following method, press the shutter while following the motion of the subject, and you will get the effect that the clear and still background of the moving subject is drawn as a dotted line, showing the motion of the subject. 3. With the slow shutter, you can shoot the effect of motion blur, with the fast moving part blurred and the slow moving part clear.