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Mastering the art of the dolly zoom by Dale Goldberg

The dolly zoom, also sometimes referred to as the "vertigo zoom" is an in camera effect that seems simple on the surface but actually requires a great deal of talent and practice to pull off. It's also perceived by some as a little gimmicky so it's only used when it's really called for.

When is it called for? Well, that's why we have a video to explain it to you. 

And, for your viewing pleasure, here's a montage of dolly zoom clips from various films.