What is dolly zoom?

Dolly Zoom

The dolly zoom is an unsettling in-camera effect that appears to undermine normal visual perception. It is part of many cinematic techniques used in filmmaking and television production.

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Some articles on dolly zoom:

Dolly Zoom - Optics - Calculating Distances
... at a certain distance from the object that is supposed to remain still during the dolly zoom ...
Scottie Ferguson - Production - Filming
... Hitchcock popularized the dolly zoom in this film, leading to the technique's sobriquet, amongst several others, "the Vertigo effect" ... This "dolly-out/zoom-in" method involves the camera physically moving away from a subject whilst simultaneously zooming in (a similar effect can be achieved in reverse), so that the subject ... full-sized set, a model of the tower shaft was constructed, and the dolly zoom was filmed horizontally ...