The “Vertigo effect” (also known as the dolly zoom) is one of my favorite camera effects. It’s accomplished by zooming the zoom lens to adjust the angle of view while the camera is moved towards or away from the subject so the subject remains the same size in the frame while the background seems to change size. It was invented by Irmin Roberts on the set of Alfred Hitchcock’s Vertigo to give the audience a “falling-away-from-oneself feeling.”
Another memorable Vertigo effect is in Jaws:
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