Compact four element afocal lens

Details Compact four element afocal lens Compact four element afocal lens

1977-06-29

1979-10-23

Sacher, Paul A.

350189, 350232, G02B 302

Patent

active

041718720

ABSTRACT:
A compact substantially afocal lens comprising two components each including two elements adapted for use as a magnifying attachment for an objective with an internal stop. Compactness in an afocal lens of good performance is obtained by the use of a strongly curved first surface followed by other strongly curved surfaces, by the choice of alternating high and low indices of refraction for the successive negative and positive elements, respectively, and by correcting the lens less well for longitudinal color and distortion than for the other aberrations.

REFERENCES:
patent: 3029700 (1962-04-01), Price
patent: 3517984 (1970-06-01), Lindstedt et al.

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