Anastigmatic anamorphic lens
AssigneeJos. Schneider Optische Werke GmbH
InventorsRolf Wartmann, Udo Schauss
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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.
Claims4
An anastigmatic anamorphic lens with a high aperture and an anamorphic factor of greater than 1.7, comprising a main objective and an afocal attachment which is formed from vertically oriented lenses,
- wherein a main objective is used, which horizontally with respect to the curved film surface has a flattened image field,
- horizontally with respect to the curved film surface has a flattened image field,
- vertically with respect to the curved film surface has a flattened or positively curved image field, and
- which has a positive astigmatism so that the meridional shell, viewed in the direction from the projection to the film surface, lies in front of the sagittal shell.
Dependencies are inferred from the claim text.