<snip>
I have been trying to figure out the difference between a "dolly out/
zoom in" as used and established by Hitchcock in _Vertigo__ and a
"dolly in/zoom out" as used by Spiellberg in _Jaws_.
While searching the two terms on the net, it seems like people use
both terms to refer to the same thing???
</snip>
This would surely be an oversight, since I believe each would give an effect different to the other.
The zoom alters the perspective of the shot (i.e. the amount of apparent compression or extension
between compositional elements and their respective magnification compared, e.g., with
the 'naturalistic' perspective of human sight) while the camera movement (here, a dolly in or out)
will affect the framing (i.e. composition in toto). Therefore, just considering the zoom, a zoom in will
compress compositional elements (make them appear to be moving in towards the middle of the
shot), while the zoom out will extend them (make them appear to move out from this middle point).
The dolly will affect the overall appearance of this effect, but the compression / extension difference
will be a clue as to which technique is actually in use in a given shot. For specific examples of the
two, I'll leave that to someone more knowledgable.
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