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Then, when zoom lenses became available, the "truckin' zoom" was quickly discovered: Dolly in at the same rate you're zooming out (or the inverse) to give a radically different depth of field/background look while retaining the same image size of the primary subject. Can add quite a dramatic effect to an otherwise static scene. Requires excellent coordination of personnel for manual execution, or a trivial bit of code if you're in a motion control/automated camera scenario.
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