Dolly Zoom:

dolly_zoom.jpg

Dolly zoom is a picture technique that is used to creative motion in a picture, presented as a motion picture. It creates an unnatural effect in the photograph, in which your eyes would not normally see it as. The background would appear to be changing in size, while the subject of the picture appears to stay motionless, with no change in size whatsoever.

With the dolly zoom, the camera would move closer or further away from the subject and while doing so, it is consistently adjusting the zoom angle giving the result in which the subject in the photograph appears to be the same size in each frame. Junior directors often overuse the dolly zoom effect in their work.

The dolly zoom effect is credited to Cameraman Irmin Roberts and made famous by Alfred Hitchcock, in which dolly zoom is also known as (-> Hitchcock). Steven Spielberg used the dolly zoom effect in Jaws and ET and made it known as “Jaws” too. The list in which Dolly Zoom is also known as is found here below.

If the camera were to move closer, the background would seem to be more dominant in the picture.
If the camera were to move farther away, the foreground of the subject would appear to be emphasized and becomes the dominant part in the picture.

Dolly Zoom is also known as
-Reverse Tracking (zoom in/dolly out or vise versa)
-Contra-zoom
-Dolly or zido
-Hitchcock zoom
-Vertigo zoom or vertigo effect
-Jaws shot
-Trombone shot
-Telescoping
-Smash zoom or smash shot
-Retrograde zoom
-Triple reverse zoom

Resources :
"Dolly Zoom." Media College - Video, Audio and Multimedia Resources. Web. 27 Aug. 2011. <http://www.mediacollege.com/video/shots/dolly-zoom.html>.