zoom z00m ZOOM

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Jeremy Vineyard, in his book Setting Up Your Shots: Great Camera Moves Every Filmmaker Should Know, says:

"The focal length of a camera lens determines the distance that that camera can 'see.' Zoom lenses allow the focal length to be gradually changed. With a zoom, the frame may transition from a wide shot to a close-up without ever moving the camera.

The zoom is considered an unnatural technique because our eyes aren't able to incrementally change our focal length. Because of this, zooms are often used for effect.

A very slow zoom can be a subtle alternative to a dolly movement in locations where there is no room to rig a dolly and track. A very fast zoom--a whip zoom--can be used to draw attention to an object in a scene. (Page 7)"

There is an editing effect that puts the zoom to good use.

When you want the viewer to pay attention to a certain object, building, or person, a filmmaker might consider using a cut zoom in.

"Cut zoom in is a technique that adds emphasis to an otherwise static shot. This technique usually has three stages: a very wide shot, a wide shot, and a medium shot. The distances for each shot can vary, but the basic idea is that, for each cut, the camera suddenly 'jumps' forward towards the subject being viewed.

To soften the effect, the camera can slowly zoom forward during the sequence."

A cut zoom in sequence of shots can consist of a non-moving camera and cut to increasing larger shot sizes. Another way to incorporate a cut zoom in is to film a slow zoom and cut out enough frames so that when played back, the camera appears to make "jump cuts". You can also do the opposite of this which would result in a cut zoom out.