High speed wide angle objective lens system

US4025169A · kind A · utility

Assignee

• Carl Zeiss Stiftung · DE

Inventors

• Helmut Fischer · Calw, DE
• Erhard Glatzel
• Walter Jahn · Ehningen, DE
• Heinz Zajadatz

Key dates

• Filing date: Mar 29, 1976
• Grant date: May 24, 1977
• Expiry date: Mar 29, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B9/64
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An extremely high speed wide angle objective lens system, wherein a reducing Newtonian finder telescope is arranged in front of an objective lens group which produces a real image on an image plane. Rules or conditions are stated, and several specific examples are given. In many of the examples, the back focus distance is relatively large, thus making the lens system suitable for use with a mirror reflex camera where room is needed for swinging the reflex mirror.