The Buchdahl dispersion equation is applied to a system of airspaced thin lenses. The powers, airspaces, and glass dispersion characteristics of a lens system are represented as a series of vectors. The sum of these vectors represents the state of paraxial color correction of the lens system. The vector representation is used as a guide in the selection of glasses for airspaced doublets (dialytes), triplets, and more complex lens systems with apochromatic color correction. Prescriptions and performance data are given.
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Robert D. Sigler (1986) studied this question.
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