
Chapter 9
Zoom-in and slow motion
9.1 Introduction
The values for the focal length of the lens and the acquisition frame rate
are very important since they have a determinant influence on the final look
and feel of the movie. For instance, by increasing the focal length we can
zoom-in on a desired image element, and by multiplying the frame rate we
can record in slow-motion. Therefore it is best to choose these values before
shooting, so as to accomodate the director’s vision. But it’s also common that
in postproduction there appears the need to perform zoom-in on a shot (e.g.
because there is an element at the frame boundary that we want to get rid
of, ...