Photographic lens with perspective-adjustment feature

US4081812A · kind A · utility

Assignee

• Carl Zeiss Stiftung · DE

Inventor

• Werner Flother · Aalen, DE

Key dates

• Filing date: Mar 10, 1977
• Grant date: Mar 28, 1978
• Expiry date: Mar 10, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B5/00
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention provides a perspective-correction lens with an automatic-diaphragm feature which permits through-the-lens viewing at full brilliance, while also permitting the diaphragm to be set in accordance with photo-electric exposure measurements performed at the body of the camera to which the lens is mounted. Such automatic-diaphragm operation is correctly performed, regardless of the extent or direction of eccentric-offset adjustment of the lens with respect to the camera axis.