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Improvements in Ross type astrometric objectives (1971)

Baker, J.

In: CASI

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Publication Date: 2005-11-30

Description: It is shown that aspheric deformations of the first and fourth elements of the four element Ross objective can be introduced to permit one to obtain improved color corrections for astrometric purposes. The usual monochromatic aberrations are as well corrected as for the standard Ross lens. In addition, one can eliminate or reduce additional aberrations, such as secondary spectrum, chromatic spherical aberration, chromatic coma and chromatic distortion. The resulting objectives are suitable for use as intermediate and long focus astrometric objectives covering large angle fields.

Keywords: INSTRUMENTATION AND PHOTOGRAPHY

Type: Univ. of South Fla. Conf. on Phot. Astrometric Technique; p 61-84

Format: text

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