# 滑动变焦

## 其它英文名称

• A "zido"
• A "zolly"
• The "Hitchcock zoom" or the "Vertigo effect"[2]
• "Hitchcock shot" or "Hunter shot"[3][4]
• 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

## 光学原理

${\displaystyle {1 \over s_{i}}+{1 \over s_{o}}={1 \over f}}$

${\displaystyle M={s_{i} \over s_{o}}={f \over (s_{o}-f)}}$

${\displaystyle M_{ax}=\left|{d \over d(s_{o})}{s_{i} \over s_{o}}\right|=\left|{d \over d(s_{o})}{f \over (s_{o}-f)}\right|=\left|{-f \over (s_{o}-f)^{2}}\right|={M^{2} \over f}}$

### 计算距离

${\displaystyle \mathrm {distance} ={\frac {\mathrm {width} }{2\tan \left({\frac {1}{2}}\mathrm {fov} \right)}}}$

## 参考文献

1. ^ Lyttelton, Oliver. 5 Things You Might Not Know About Alfred Hitchcock’s Masterpiece ‘Vertigo’. IndieWire. 2012-05-09 [2018-08-09] （美国英语）.
2. Wickman, Forrest. “The Evolution of the Dolly Zoom,”in One Supercut. Slate. January 21, 2014.
3. ^
4. ^