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Angle of View is the angle in a lens
between imaginary lines drawn from opposite edges of the image on
the film plane to the optical center (second nodal point) of the
lens. The object size and focal length determine the angle of view
and only objects within this angle will appear in the final picture.
The angle of view changes according to the focal length of each
interchangeable lens. It dictates the range of photography for each
lens and the image size at a given distance, The series of
photographs below shows the effect of focal length upon angle of
view in a sequential change from the 24mm wide-angle to the 200mm
telephoto lenses while the shooting distance remains the same. The
shorter the focal length, the wider the range and the smaller the
subject. Thus, with a lens of short focal length, such as a
wide-angle lens, the angle of view is wide and the magnification
small, while telephoto lenses have narrow angles of view and large
images. Angle of view is the basic factor in the selection of a
lens. It should be chosen in consideration of the subject to be
photographed most often. |
