Controls for Creating Effective Images on Film or Digitally 303
Figure 16-5 Depth-of-fi eld at different apertures. (1) With the lens focused on the subject at 20
feet and the aperture wide open, the depth-of-fi eld may extend from 19 to 22 feet with one-
third in front and two-thirds behind the focused distance. (2) With the lens closed down, the
depth-of-fi eld increases; for instance, to a range from 17 to 26 feet still with one-third in front
and two-thirds behind the focused distance.
Figure 16-6 Depth-of-fi eld scales. (1) The depth-of-fi eld is the distance range on the focusing ring
between the aperture fi gures on the left and right that corresponds to the aperture (here,
f/11) on the lens. (2) The same scales, here set for f/8, are on FE, TCC, and F lenses.
used from the same distance. In such a case, the wide angle lens has more depth-of-fi eld but
also covers a much larger area than the standard or telephoto lens. The three lenses create
three completely different images (see Figure 16-8).
If you use different focal length lenses to cover the same size area by taking the pic-
tures from different distances, the depth-of-fi eld is exactly the same with every lens. It can be
changed only by opening or closing the aperture (see Figure 16-9).
Keep this fact in mind especially in close-up work where you usually need or want to
cover a specifi c area. Regardless at what focal length you take the picture, the depth-of-fi eld
is the same. Depth-of-fi eld is really determined by the magnifi cation, not the focal length of
the lens.
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