Lenses, Continued
Depth of field
Figure 7-21 shows the aperture set at f/8 on a standard lens. The depth of
(Continued)
field when focused on a centered subject extends from just in front of the
subject (at 2½ feet) to just behind the subject (at 5½ feet). At f/16, the depth
of field increases to just over 2 feet to 10½ feet.
Figure 7-21.—Reading depth of field.
Use this table for guidance in increasing or decreasing depth of field.
Decreasing depth of field
Use a larger f/stop (lower number).
Use a small f/stop (higher number).
Use a longer focal-length lens.
Use a short-focal length lens.
Move closer to the subject.
Increasing depth of field
Use a faster film or slower shutter
speed or a smaller f/stop.
Focus at the hyperfocal distance or
infinity.
7-33
