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Videography

1.  Why should you avoid using autofocus when doing videography?
Autofocus should be avoiding in videography because the camera will make mistakes such as focusing on the background instead of the subject.  If you film an entire video using autofocus and it automatically focused on the wrong thing, then you would have to refilm your video with the right focus.  
2.  When is using the autofocus acceptable?
Autofocus can be useful when filming a video with minimal movement and when the distance between the subject and the camera remains the same.  
3.  What are the 4 steps to properly set your focus manually when shooting a static subject (such as an interview)?
First, set the camera to manual focus.  Then zoom in on the static subject's face.  Adjust the focus so that their eyes are in focus.  Finally, zoom out to the desired frame.
4.  What does the term "rack focus" mean?
The term "rack focus" refers to changing the focus on the lens during a shot. This can change the attention of the viewer and make the shot more dramatic.  

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