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Dolly: Motion towards or motion from. The name comes from the old "dolly tracks" that used to be laid down for the heavy camera to move along - very much like railroad tracks - in the days before Steadicams got so popular. The phrase dolly-in means step towards the subject with the camera, while dolly-out means to step backwards with the camera, keeping the zoom the same. Zooming the camera changes the focal length of the lens, which can introduce wide-angle distortion or changes in the apparent depth of field. For this reason, it's sometimes preferable to dolly than zoom.
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