Lens system for modifying spherical aberration

Details Lens system for modifying spherical aberration Lens system for modifying spherical aberration

1976-08-06

1977-06-14

Sacher, Paul A.

350220, G02B 1320, G02B 934

Patent

active

040293963

ABSTRACT:
A lens system for modifying the spherical aberration of optical apparatus comprises three groups of lens elements arrayed in order along an optical axis of the apparatus: a first lens group has a negative optical power; a second lens group has substantially zero optical power and is bent to have a substantial amount of spherical aberration; and a third lens group has a positive optical power. The relative spacing between the second lens group and the first and third lens groups is variable to modify the spherical aberration introduced into the optical apparatus.

REFERENCES:
patent: 65729 (1867-06-01), Dallmeyer
patent: 1446634 (1923-02-01), Bell et al.

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