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filingDate 1972-02-24-04:00^^<http://www.w3.org/2001/XMLSchema#date>
grantDate 1973-10-02-04:00^^<http://www.w3.org/2001/XMLSchema#date>
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publicationDate 1973-10-02-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber US-3762801-A
titleOfInvention Compact three component objective lenses
abstract Compact air-spaced three component photographic objective lenses with overall lengths less than one-eighth their nominal focal length are shown. Chromatic and spherical aberrations, astigmatism, field curvature, and distortion are corrected. The Petzval sum does not exceed 0.300, and the total relative refractivity exceeds 35 percent of the central element''s refractivity. In certain species, focusing is accomplished by axially displacing the first component.
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Total number of triples: 69.