Abstract: A camera wherein exposure parameters fixed by a program line can be shifted along an exposure value EV line so that exposure parameters for an exposure operation are based on the shifted program line according to the preference of the camera user.The camera has setting means for temporarily changing these exposure parameters at a constant exposure value with respect to the values predetermined by a program line. A counting means counts the number of times that a shutter is released while the program line is shifted in one direction and control means stores the changed values for shifting the program line under certain conditions. In this way a learning function is provided to learn the aforementioned tendency of the user.

Abstract: A camera having a zoom lens. The camera includes a shutter, an aperture and program exposure mode control. The program exposure control includes one or more reference program characteristics representing combinations of shutter speed and aperture corresponding to one or more of a portrait mode, a landscape mode and a close up mode. Each reference program characteristics define a predetermined aperture in a first range from a low shutter speed to a hand-induced vibration limit and defines a different aperture in a second range beyond the hand-induced vibration limit. One of the reference program characteristics is selected, wherein the hand-induced vibration limit is defined in accordance with a focal length of said zoom lens.

Abstract: A lens for a photographic camera adapted to be mounted on a camera body, has a lens barrel, a lens mount secured on the lens barrel, and at least one contact for transmitting information to the camera body. The contact has first and second contiguous portions independently movable into and out of the lens mount. A first spring urges the first portion of the contact out of the lens mount. A second spring independent of the first spring urges the second portion of the contact out of the lens mount. Preferably, the first portion of the contact is a hollow cylinder, the second portion of the contact fits in the hollow of the first portion, and the ends of the first and second portions facing away from the lens mount are both convex and smoothly continuous at their convex ends.

Abstract: A camera has a camera body with an electrically conductive camera mount and an interchangeable lens with a lens mount. The lens mount is secured to the camera body by rotation of the lens mount relative to the camera body with flat surfaces of the lens mount and the camera mount in abutting relationship. A first electrical contact in the lens mount is movable normal to the flat surface thereof. A spring urges the first contact out of the flat surface of the lens mount. A stationary second electrical contact in the camera mount opens toward the flat surface thereof without protrusion in alignment with the first contact when the lens mount is secured to the camera mount so the first contact normally bears against the second contact. The second contact is insulated from the camera body. The second contact is alternately connected and disconnected electrically to and from the camera mount through the first contact. A plurality of third contacts in the camera mount are movable normal to the flat surface thereof.

Abstract: An interchangeable lens is provided with a plurality of contacts arranged in recesses and engaged with one side of a lever actuated when the lens is mounted to a camera. Upon mounting, the contacts protrude beyond the end of the lens into recesses in the camera body to make contact with a further set of electrical contacts arranged therein.

Abstract: A lens barrel for a camera body, having a first mount electrically connected to a first branch circuit and a first electrical contact connected to a second branch circuit, has a movable second contact which is retractable into a surface of a second mount on the lens barrel. A switching member is electrically connected to the movable second contact and is adapted to extend and retract the latter so that the movable second contact is electrically connected to the first contact of the camera body when extended, and is spaced apart therefrom when retracted. The switching member has a lower end portion having a third contact thereon, which electrically connects the switching member, the movable second contact and the second branch circuit with the first branch circuit when the movable second contact is extended.

Abstract: A data transmitting electrical contact switching device for a camera adapted for operation in both a shutter speed priority automatic exposure mode and an aperture priority automatic exposure mode. First and second switching electrical contacts are provided on a lens mount and a body mount, respectively, at positions opposite one another. The first switching electrical contact is urged elastically to protrude from a surface of a lens mount while the second switching electrical contact is recessed from the surface of the body mount. A switching plate supports the first switching electrical contact with a pin located at an end portion of the switching plate. The pin is positioned in an elongated groove formed in an aperture preset ring so as to prevent protrusion of the first switching electrical contact in other than the automatic aperture control mode.

Abstract: A click stop mechanism for an interchangeable lens. A first click stop ball is adapted to engage with any of a plurality of click grooves formed in an inner wall of an aperture preset ring corresponding to both manual aperture preset marks and an automatic aperture preset mark. A switch button protrudes through a stationary ring in which the first click ball is fitted and the switch pin is slidably disposed in the hollow switch button with a coil spring therebetween. A second click ball is disposed so as to engage in either of two click grooves formed on opposite sides of the base portion of the switch button corresponding to the minimum manual aperture preset mark and the automatic aperture preset mark.

Abstract: A camera body having a camera body and an interchangeable lens engageable with the camera body has an improved contact arrangement between camera body and lens. A lens mount has a first flat surface, a camera mount engages a lens mount to join the lens to the camera body, and the camera mount has a second flat surface abutting the first flat surface when the lens mount engages the camera mount. One or more first electrical contacts in the lens mount are movable normal to the first surface between a retracted position approximately flush with the first surface and an extended position projecting from the first surface. A spring urges the one or more first contacts toward the extended position.

Abstract: A camera has a camera body, an interchangeable lens engageable with the camera body, and a rotatable diaphragm setting ring on the lens. A first mounting member on the camera body interlocks with a second mounting member on the lens to engage the lens with the camera body. A hole is formed in the second mounting member adjacent to the first mounting member and a slideable lock pin is disposed in the hole. The ring is rotatable between an automatic diaphragm control position and a range of diaphragm preset positions. Responsive to the diaphragm setting ring, the pin is retracted to a position approximately flush with the surface of the second mounting member when the diaphragm setting ring is within the range of diaphragm preset positions and the lock pin is extended outwardly from the surface of the second mounting member to the region occupied by the first mounting member when the diaphragm setting ring is at the automatic diaphragm control position.

Abstract: A camera body having a camera body and an interchangeable lens engageable with the camera body has an improved contact arrangement between camera body and lens. A lens mount has a first flat surface, a camera mount engages a lens mount to join the lens to the camera body, and the camera mount has a second flat surface abutting the first flat surface when the lens mount engages the camera mount. One or more first electrical contacts in the lens mount are movable normal to the first surface between a retracted position approximately flush with the first surface and an extended position projecting from the first surface. A spring urges the one or more first contacts toward the extended position.