Canon FD Lens, Manual Book

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If you're familiar with photography, you probably already know
that focal length governs angle of view. If taken from the same
position, longer focal lengths produce larger images, whereas
shorter lenses provide broader angles of view. But there is
more to angle of view than this. Look at the two pictures below
made with telephoto lenses, a 100mm and a 200mm. The girl
clearly becomes the main point of attention. Notice how her
personality is easily conveyed in the telephoto pictures. With
the 28mm lens, on the other hand, the scene takes on quite a
different feeling. The girl harmonizes with the background, and
the shape of the windows and railing takes on more importance
in the picture. In other words, telephoto lenses are ideal when
you'd like to emphasize or bring a subject in closer. Wide
angles are the choice when you want to give the subject's back-
ground equal importance. A zoom lens is particularly handy
here because it lets you choose between wide and narrow
angles without changing position or lens.
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Take in a little, or a lot — Angle of view.
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