Pull focus is a technique used in video when focus is shifted from one item to another, often shifting from a person/item to the background. This technique is often used in films in conversations, as when you focus a subject a viewer's eyes are automatically drawn to that item, so if, for example two people are having a conversation, but only one is in focus, they are the subject of the viewer's attention and if the camera shifts focus to the other person, they become the subject of attention[1].
Process: To create the above shot, I shifted the focus from the hand in the foreground to the door in the background, so that the signs become visible. I think this video is quite effective in showing this technique.
Problem Solving: In order to solve some initial problems I had, such as defining the focus between the foreground subject and the background, I had to decrease the aperture to create a more shallow depth of field. I also zoomed in slightly so that the definition between the focus of the hand and the door becomes clearer. I also used a tripod so that the video was not shaky. It was also fairly difficult to find the right location to film this shot as in a cramped location both subjects would be in focus when I only wanted the background in focus.
Justification: I chose to shoot this shot because the corridor leading up to the door is fairly long, so it was easier to get a clearer focus between the two subjects rather than when in a smaller location. Also the door was readily available and easily accessible.
Recommendations: If I were to change anything in this shot, it would be to try it with two people in a conversation to try and shift the attention from one to another.
References:
1- http://www.mediacollege.com/video/camera/focus/pull.html
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