A dolly zoom combines a track in or track out movement with the apparent movement of a zoom in the opposite direction. Depending on whether it is a dolly out/zoom in, or a dolly in/zoom out, either the background shifts towards the foreground or away from it. The respective zooming direction and additional perspective changes caused by the camera movement produce either a special dizzying or oppressive effect. A dolly zoom is also variously known as “dolly counter zoom”, “reverse tracking shot”, the “Hitchcock zoom”, the “Vertigo effect”, or the “Trombone effect”.
