Dolly Zoom
Moving the camera backward while zooming in, or forward while zooming out. The subject stays the same size while the background stretches or squeezes, which shows a character's shock or unstable state of mind.
How this film uses it
Paramount second-unit cameraman Irmin Roberts devised the technique for this film at Hitchcock's request, to show Scottie's vertigo. When Scottie looks down a stairwell, the walls seem to pull away while the floor rushes up. The camera shows you what his mind tells him is there. What he feels and what he sees are joined in a single shot.
Where to see it
Scottie looking down the bell tower stairwell. The camera makes a move that looks impossible, and you feel the vertigo from the inside.


















