Dolly zoom or Vertigo shot

The dolly zoom effect is an unsettling in-camera special effect that appears to undermine normal visual perception in film.

The effect is achieved by using the setting of a zoom lens to adjust the angle of view (often referred to as field of view) while the camera dollies (or moves) towards or away from the subject in such a way as to keep the subject the same size in the frame throughout. In its classic form, the camera is pulled away from a subject whilst the lens zooms in, or vice-versa...