Single-lens reflex camera

Details Single-lens reflex camera Single-lens reflex camera

1998-01-30

1999-12-07

Perkey, W. B.

Photography

Exposure control circuit

Maximum or minimum f-number responsive

396239, G03B 720

Patent

active

059997532

ABSTRACT:
A single-lens reflex camera with a full-aperture metering part includes a lens having an automatic diaphragm part, a lens mount, and an information transmitting part for transmitting information for full-aperture metering error compensation, and a camera body having a lens mount attachment part to which the lens mount of the lens is detachably attached, information receiving part for receiving the information for full-aperture metering error compensation from the information transmitting part of the lens, and a mode setting part for selecting one of various exposure modes including an automatic exposure mode. When the information receiving part receives no information for full-aperture metering error compensation from the information transmitting part in a state where the lens is attached to the camera body, the mode setting part enables the automatic exposure mode to be set, and the automatic diaphragm part forcibly sets an aperture to a full-aperture condition.

REFERENCES:
patent: 3394644 (1968-07-01), Ettischer
patent: 4558940 (1985-12-01), Tano et al.
patent: 4577952 (1986-03-01), Urano et al.
patent: 4582412 (1986-04-01), Wakabayashi
patent: 4623234 (1986-11-01), Shimizu et al.
patent: 4912498 (1990-03-01), Nakai et al.
patent: 5012268 (1991-04-01), Hirai
An English Language Abstract of JP 63-271239.

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