Abstract: An autofocus camera having a plurality of object distance measuring zones and a photographing lens system. A distribution pattern of objects is deflected in the object distance measuring zones in accordance with object distances of the objects. An axial position of at least a part of the photographing lens system is adjusted in the optical axis direction to detect the position of the focal plane so that the focal plane can be varied. The adjusting of the axial position of at least a part of the lens system and the varying of the focal plane are driven in accordance with the distribution pattern of the objects so that the focal point of the photographing lens meets the objects.

Abstract: An exposure control apparatus of a camera having a photometer, a film sensitivity detector, a calculator which calculates an exposure value, a diaphragm value and a shutter speed in accordance with a measurement by the photometer and the film sensitivity, an object distance detector, a strobe, a limit diaphragm value calculator that calculates a first limit diaphragm value, which varies with the film sensitivity, and a second limit diaphragm value, which varies with the object distance, when strobe light is emitted, and a minimum limit diaphragm value setting device which compares the first and second limit diaphragm values and selects the larger diaphragm value as the minimum limit diaphragm value to be used in the exposure control.

Abstract: A photometering apparatus for a camera is provided that includes a split type photometering device for measuring the luminance of an object to be photographed and in which an image area is divided into a plurality of object luminance measuring zones, an automatic focusing device which selectively has a focus lock mode in which once an object within an object distance measuring is in focus, the focus is maintained, and a non-focus lock mode in which the focus is continuously adjusted within the object distance measuring zone. The photometering apparatus also includes an exposure controller which varies the weighting of the luminance signals of the object luminance measuring zones of the split type photometering device, in order to calculate an exposure value, depending on the selection of the focus lock mode or the non-focus lock mode.

Abstract: An exposure control apparatus of a camera, in which at least one of a pair of exposure factors that include a shutter speed and a diaphragm value is variable. An exposure factor setting device sets at least one variable exposure factor, while a limit value setting device varies and sets at least one upper and lower limit value of the exposure factor.

Abstract: In a distance measuring device for projecting light beams to a plurality of distance measurement points, and for detecting reflected light beams in order to measure the distances from the device to the distance measuring points, light emitted by the light source is optically/mechanically directed to a plurality of two-dimensionally distributed distance measuring points, then the reflected light from each of the distance measuring points is received and the distance between the device and each of the distance measuring points is detected.

Abstract: An exposure control device of a camera by which an appropriate camera-shake limit shutter speed T.sub.vf can be obtained in accordance with a focal length f of a photographing lens, and by which an arbitrary program diagram can be set on the basis of the shutter speed T.sub.vf, in which T.sub.vf is obtained by an equation:T.sub.vf =log.sub.2 f,orT.sub.vf =(log.sub.2 f).multidot..alpha.+.beta.;wherein .alpha.<1, and .alpha. and .beta. are constants which satisfy log.sub.2 f.sub.o =(log.sub.2 f.sub.o).multidot..alpha.+.beta. for a predetermined arbitrary focal length f.sub.o.

Abstract: An autofocus camera having a plurality of object distance measuring zones and a photographing lens system. A distribution pattern of objects is deflected in the object distance measuring zones in accordance with object distances of the objects. An axial position of at least a part of the photographing lens system is adjusted in the optical axis direction to detect the position of the focal plane so that the focal plane can be varied. The adjusting of the axial position of at least a part of the lens system and the varying of the focal plane are driven in accordance with the distribution pattern of the objects so that the focal point of the photographing lens meets the objects.

Abstract: In a distance measuring device for projecting light beams to a plurality of distance measurement point, and for detecting reflected light beams in order to measure the distances from said device to said distance measuring points, light emitted by the light source is optically/mechanically directed to a plurality of two-dimensionally distributed distance measuring points, then the reflected light from each of the distance measuring points is received and the distance between the device and each of the distance measuring points is detected.

Abstract: An exposure control apparatus of a camera having a memory on a photographing lens for storing lens information of the photographing lens. A lens information input device is provided on the camera body to which the photographing lens is mounted, for inputting the lens information stored in the memory. The memory has optimum diaphragm data which is determined in accordance with a predetermined specific condition of the photographing lens and which is stored in the memory as the lens information. The camera body includes an exposure operating device which arithmetically sets an exposure parameter based on the optimum diaphragm data which is input to the camera body through the lens information inputting device from the memory.

Abstract: A multi-area brightness measuring apparatus for a camera, which measures the brightness of an object in a center area of a photographing area and a circumferential area surrounding the center area to detect whether the object in the center area is in follow light state or in back light state in order to correct the exposure value. The exposure also can be controlled in accordance with the magnification, i.e. in accordance with the surface area of a main object occupying the center area.

Abstract: An exposure control device for an interchangeable-lens camera in which factors preventing the establishment of a relationship which ensures proper matching of the photographing lens and the camera body on both the lens side and the camera body side are taken into account. Memories are provided both in the lens and the camera body for storing values characterizing the lens and camera body with respect to parameters such as focal length, exit pupil position, vignetting factor, and open-aperture F number. Specific equations are disclosed for carrying out corrections.

Abstract: An electronic control camera in which, when an electronic flash is used with the camera, the required exposure data is automatically set. In the electronic control camera to which the invention pertains, film sensitivity data and luminance data provided by a photometric unit are applied to a data processing unit, which utilizes those tow data values to control the shutter speed and/or the aperture value. Further, the data processing unit varies the shutter speed, the aperture value and/or the amount of light emitted by the electronic flash coupled to the camera in accordance with these two data values.

Abstract: An exposure control device of a camera by which an appropriate camera-shake limit shutter speed T.sub.vf can be obtained in accordance with a focal length f of a photographing lens, and by which an arbitrary program can be set on the basis of the shutter speed T.sub.vf, in which T.sub.vf is obtained by an equation:T.sub.vf =log.sub.2 f,orT.sub.vf =(log.sub.2 f).multidot..alpha.+.beta.;wherein .alpha.<1, and .alpha. and .beta. are constants which satisfy log.sub.2 f.sub.o =(log.sub.2 f.sub.o).multidot..alpha.+.beta. for a predetermined arbitrary focal length f.sub.o.

Abstract: A focus detecting device for use with a single-lens reflex camera in which chromatic aberration of an infrared beam used for focusing is corrected. When the brightness of the image to be photographed is sufficiently high, a beam of visible light is used for focusing, while when the brightness is not sufficiently high, an infrared beam is employed. In the latter case, a chromatic aberration correction signal is employed to correct the focus detection signal so that the focused position as indicated by that signal coincides with that in the case of the visible beam for the same distance to the object. The chromatic aberration correction signal is preferably produced in response to a resistor or the like mounted on the lens.