Three-lens system providing a variable focal power along one pri

Details Three-lens system providing a variable focal power along one pri Three-lens system providing a variable focal power along one pri

1976-07-16

1977-08-23

Sacher, Paul A.

350190, G02B 1308

Patent

active

040436411

ABSTRACT:
Variable focal power along one principal meridian may be obtained by an optical system having two cylinder lenses at either end and their axis of cylinder in a single plane spaced along an optical axis. A moveable cylinder lens with its axis oriented 90.degree. to the plane is slideably mounted therebetween. A plano color correction plate substantially eliminates color aberrations which would otherwise be present in the system.

REFERENCES:
patent: 3576357 (1971-04-01), Levy

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