Page 103 - Modern Optical Engineering The Design of Optical Systems
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86 Chapter Five
Figure 5.12 Spherical aberration and coma as a function of lens
shape. Data plotted are for a 100-mm focal length lens, index
1,517, (with the stop at the lens) at f/10 covering 17° field.
shown in Fig. 5.13. The spherical and axial chromatic aberrations
are completely unchanged by shifting the stop, since the axial rays
strike the lens in exactly the same manner regardless of where the stop
is located. The lateral color and distortion, however, take on positive values
when the stop is behind the lens and negative when it is before the
lens. Figure 5.14 shows a plot of lateral color, distortion, coma, and
Figure 5.13 The aperture stop
away from the lens. Notice that
the oblique ray bundle passes
through an entirely different
part of the lens when the stop is
in front of the lens than when it
is behind the lens.
