351584.fig.002a
(a)
351584.fig.002b
(b)
351584.fig.002c
(c)
351584.fig.002d
(d)
Figure 2: Edmund Optics 20 mm achromatic doublet: (a) original lens and (b) on axis OPD fan, (c) forward and reversed ray tracing model and (d) on axis OPD fan. The OPD fan full scale is 0.5 waves.