6. Examples of corrected optical systems
The following examples have been chosen not for their performance, but because they illustrate innovative approaches, and are simple enough to explain certain design processes.
6.1 Fixed-focus lenses
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Cooke Triplet
The Cooke triplet (figure 49 ) is the simplest lens with all its Seidel aberrations corrected. The central, divergent component must be highly dispersive to compensate for the dispersion of all convergent elements, and cancel out longitudinal chromatic aberration. If conjugation corresponds to unitary magnification, symmetry eliminates transverse chromatic aberration, coma and distortion. We show that a slight deviation from symmetry...
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Examples of corrected optical systems
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