Patent · US Expired

Single lens reflex camera with interchangeable lens

US4051495A · kind A · utility

2Cited by

2References

12Claims

0Family size

Assignee

Carl Zeiss Stiftung · DE

Inventors

Waldemar Rentschler
Franz Starp · Greding, DE

Key dates

Filing date	Oct 29, 1976
Grant date	Sep 27, 1977
Priority date	—
Expiry date	Oct 29, 1996

Classification

Technology area (CPC G)Physics
CPC primaryG03B19/12
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A photographic camera of the single lens reflex type, having provision for interchangeable lenses. Whenever a lens is not fully and properly engaged with and seated on the camera, the image on the focusing screen is blurred or altered from the normal image in a way to attract the attention of the photographer, so that he can make immediate correction before losing the opportunity to take the picture he wants.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.