Anastigmatic anamorphic lens

US6310731A · kind A · utility

Assignee

• Jos. Schneider Optische Werke GmbH · DE

Inventors

• Rolf Wartmann · Bösinghausen, DE
• Udo Schauss · Bad Sobernheim, DE

Key dates

• Filing date: Mar 10, 2000
• Grant date: Oct 30, 2001
• Expiry date: Mar 10, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B13/08
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An anastigmatic anamorphic lens, in particular for the projection of Cinemascope films, with a high aperture and an anamorphic factor of greater than 1.7. The anastigmatic anamorphic lens comprises a main objective with considerable positive astigmatism. A main objective which might otherwise be unsuitable for projection because of aberration phenomena, in combination with cylindrical afocal attachments, has its image defects supplemented with the typical aberrations of the attachments in such a way as to achieve an optimum overall result.