A simple three-element eyepiece is presented which has a zero Petzval sum and is corrected for both longitudinal and lateral color. Following a third-order analysis, results of ray tracing several examples are presented. Designs using a single glass are useful at f/4 and 40°, and multiglass designs can be used at f/3 and 40°. These latter designs also correct the coma of a paraboloidal mirror objective.
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