A dolly zoom is where the camera simultaneously zooms in whilst the dolly moves backwards. The dolly zoom was invented by a camera man called Irmin Roberts and first became recognised and made famous by Alfred Hitchcock’s 1958 ‘Vertigo’.
The video above is from Vimeo and it shows many different examples of dolly zooms from a variety of films. Dolly Zooms in these examples are used in conjunction with unsettling non-diegetic sounds and in our use of a thriller, will go perfectly for making the audience feel uncomfortable. It is effective, only if used in the right circumstance; i.e. amplifying a characters emotions of doubt, panic and worry.