Collor-corrected Mangin mirror.
Extension of the principle of the Mangin mirror to a color-corrected version yields designs superior to the equivalent paraboloid. This is true theoretically with regard to coma correction and practically with regard to ease of fabrication, particularly for high relative apertures. Examples are given of designs with low secondary spectrum and one with zero third-order coma.
Rosin
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Kollsman Instrument Corporation,80-08 45th Avenue, Elmhurst, New York 11373, USA.
Amon
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