Correction system for aperture control of single-lens reflex camera with interchangeable lens and its interchangeable lens used for the system

Abstract

Abstract PURPOSE: To perform stop-down operation with high precision after an error is corrected by providing an aperture coupling lever which operates corresponding to the settlement position of an aperture settling ring, and by supplying an arithmetic input to a settling element selected by the aperture coupling lever when the aperture settling ring is rotated to the automatic aperture control position. CONSTITUTION: The output of photodetector PE with object brightness BV is sent to arithmetic circuit C 2 , which performs arithmetic by using shutter speed information TV and film speed information SV. On the other hand, an interchangeable lens is equipped to camera CA and its aperture settling ring is rotated and settled at the automatic aperture control position. Then, outputs of correction signal member C 5 and minimum aperture signal member C 6 are supplied to arithmetic circuit C 7 , whose result is inputted to arithmetic circuit C 8 together with the output of arithmetic circuit C 2 , so that APEX display value AV of the aperture value will be displayed in the finder by display circuit C 9 . This AV value is compared with the output of arithmetic circuit C 12 by comparing circuit C 13 to exercise aperture control. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Fumio Urano
• 👤 Zenichi Okura
• 👤 Masahiro Kawasaki

Bibliographic Details