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