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Zooming
is unnatural, since the human eye is not capable of comparable
action, i.e. changing the focal length. Zooming is not actually
dollying,
since it is done as a zoom objective effect by changing the
focal length. There is always perspective distortion when
zooming.
The
advantages of zooming are speed, controlling unexpected movements,
and expression.
Effects of zooming:
- The focal length changes, so the deep focus and perspective
change as well.
- The lens speed changes, since the f-number decreases.
- The aperture influences the depth of field in different focal
lengths.
Cf. Optics
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