Pull focus is the camera technique where the focus changes whilst shooting. this technique is usually used to change the focus from one subject to another. this focus is good as it allows the director to guide the audience into focusing on what subject to another. this can technique can also create a disorientating effect when the focus changes within the shot. this effect achieved by beginning with a low aperture (approximately f/2. 8-4). the focus must be set on manual so you are able to use the ring on the lens. a main focus must be in the foreground. proceed to twist the ring changing the focus to something within the background. this shot can be used in multiple formats, for 1 it can be used to transition from a different scene, add drama to a shot or combine multiple shots at once.
within this example, in the movie 'Predator' you can clearly see that the focus is being changed to show the perspective of different characters within the film
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