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The dolly zoom is an unsettling in-camera effect that appears to undermine normal visual perception. The effect is achieved by zooming a zoom lens to adjust the angle of view (often referred to as field of view or FOV) while the camera dollies (moves) toward or away from the subject in such a way as to keep the subject the same size in the frame throughout. In its classic form, the camera angle is pulled away from a subject while the lens zooms in, or vice versa. Thus, during the zoom, there is a continuous perspective distortion, the most directly noticeable feature being that the background appears to change size relative to the subject. The visual appearance for the viewer is that either the background suddenly grows in size and detail and overwhelms the foreground, or the foreground becomes immense and dominates its previous setting, depending on which way the dolly zoom is executed. As the human visual system uses both size and perspective cues to judge the relative sizes of objects, seeing a perspective change without a size change is a highly unsettling effect, often with strong emotional impact. The effect was first conceived and patented by Romanian Director of Photography Sergiu Huzum, but was first used by Irmin Roberts, a Paramount second-unit cameraman, in Alfred Hitchcock's film ''Vertigo''. == Alternative names == A dolly counter zoom is also variously known as: *A "zido" *A "zolly" *The "Hitchcock zoom" or the "''Vertigo'' effect" *"Hitchcock shot" or "''Hunter shot''"〔(【引用サイトリンク】Hitchcock's Vertigo: One Viewer's Viewing )〕 *Triple Reverse Zoom *Reverse Tracking Shot *Back Zoom Travelling *Hunter Smith Shot *"Smash Zoom" or "Smash Shot" *A "Jaws shot" *''Vertigo'' zoom *Telescoping *Trombone shot *Push/pull *The Long Pull *The Trombone Effect *A Stretch shot *Reverse Pull *More technically as ''forward zoom / reverse tracking'' or ''zoom in / dolly out'' *Trans-trav (in Romanian and Russian), from trans-focal length operation and travelling movement *Contra-zoom 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dolly zoom」の詳細全文を読む スポンサード リンク
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