Abstract: An exposure control system for a camera, which is provided with a strobe, includes a photometry system that measures brightness of an object; an exposure parameter determining system that determines exposure parameters in accordance with the brightness detected by the photometry system; a judging system that judges whether a daylight synchro-flash photographing is executed; and an exposure parameter changing system that changes at least one of the exposure parameters determined by the exposure parameter determining system when it is judged that the daylight synchro-flash photographing is executed.

Abstract: An optical system comprises a pentagonal roof prism and a transparent plate. A rear surface of the pentagonal roof prism is provided with a triangular recessed portion. The wall of the recessed portion is frosted. The transparent plate is a triangular plate, slightly smaller than that of the recessed portion, and is applied to the wall of the recessed portion. The obverse face of the transparent plate is a transparent or polished surface. The transparent plate is applied to the recessed portion with adhesive having photo-transmissibility. It is preferable that the adhesive does not shrink when hardening.

Abstract: A photometering apparatus having a photometering lens and a light receiver to measure a finder screen of a single lens reflex camera, wherein the photometering lens and the light receiver are arranged so that the focusing screen is substantially conjugate with a light receiving surface of the light receiver, and a transparent optical element is inserted between the photometering lens and the light receiver.

Abstract: A photometric device includes split photometric sensors for photometrically measuring a plurality of different split regions of a subject image formed by photometric optical systems. The split photometric regions of each split photometric sensor are formed in such a manner as to partially overlap with the split photometric regions of the other split photometric sensor. The photometric optical systems defocuses the images so that the combined photometric sensitivity distribution changes smoothly from the center of the subject region toward a periphery thereof.

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.

Abstract: A prism has a notch at a lower end of a third reflection plane of a pentagonal roof prism. The notch has a frosted wall, on which a transparent plate is adhered with adhesive. A miniature prism is adhered to the transparent plate with adhesive. The adhesive has photo-transmissibility, so that a transparent plane is formed between the pentagonal prism, the transparent plate and the miniature prism. Information displayed by an indication device is directed to an eyepiece optical system, via a mirror and the miniature prism.

Abstract: In a photometering lens for an SLR camera in which object light transmitted through a finder screen and emitted from a reflecting optical member is received by a light measuring receiver, wherein the photometering lens has a light path for illumination light upon assembling the light measuring receiver, said illumination light being applied from said reflecting optical member toward the light measuring receiver, and wherein the position of said light measuring receiver is determined in accordance with an image of the light measuring receiver formed on the finder screen. An adjusting method of a photometering device having a photometering lens to adjust the position of the light measuring receiver is also disclosed.

Abstract: A camera having a photographic mode automatic selecting apparatus. A photographic mode selecting device selects a photographic mode from a plurality of photographic modes. A photographic distance detecting device detects photographic distance data of a photographic lens. The photographic mode selecting device selects an appropriate photographic mode from the plurality of photographic modes based on the photographic distance data of the photographic lens.

Abstract: An indicating apparatus within a viewfinder of a single lens reflex camera has a quick return mirror, which reflects light from an object passing through a photographing lens to form an object image on a focusing glass, and a viewfinder optical system, through which the object image can be observed. The quick return mirror can be rotated between an inclined viewing position and a horizontal or photographing position. A photographing information projector projects an image of photographing information on a predetermined position of the finder screen. The photographing information projector is disposed on a straight line connecting a predetermined point included in a plane corresponding to the exit pupil and a predetermined arbitrary point included in the predetermined position when the optical axis is optically developed.

Abstract: An exposure mode selecting device uses an A-position AE mode code, an M-position AE mode code, and a no-aperture-ring AE mode code, so that a proper exposure mode is selected. When an interchangeable lens, having an aperture ring being set to an A-position, is attached to a camera body, the A-position AE mode code is set to 0 or 1 so that a program mode or a shutter speed priority mode can be selected. If the aperture ring is set to one of the M-positions, the M-position AE mode code is set to 0, 1 or 2 so that an aperture priority mode, a manual mode or a bulb mode can be selected. When an interchangeable lens having no aperture ring is attached to the camera body, the no-aperture-ring AE mode code is set to 0, 1, 2, 3 or 4 so that the program mode, the shutter speed priority mode, the aperture priority mode, the manual mode or the bulb mode can be selected.

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 TTL exposure control apparatus having a camera body to which different interchangeable lenses can be detachably attached is disclosed. At least one of the interchangeable lenses is an interchangeable wide-angle lens having a distortion. The wide-angle lens has a memory for storing an exposure correction value corresponding to the distortion. The camera body includes a photometering device which measures photometering data using light transmitted through the interchangeable lenses, and a photometering data correcting device for correcting the measurements by the photometering device in accordance with the exposure correction value read from the memory when the interchangeable wide-angle lens is attached to the camera body.

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 camera having a manually actuable switch for temporarily shifting the camera to an optimum exposure value so that exposure factors, based upon a manually set shutter speed and a manually set aperture value, are replaced by optimum exposure factors based upon a metered brightness of the object to be photographed when the camera is set to a non-program exposure mode. A clear button associated with the camera functions as a manually actuable switch for temporarily shifting an exposure mode of the camera to another exposure mode when the camera is set to a hyper-manual exposure mode. In the hyper-manual exposure mode, a photographer sets exposure factors by actuating a Tv electronic dial and an Av electronic dial. Actuation of the clear button when the camera is set to the hyper-manual exposure mode causes the set exposure factors to be replaced with optimum exposure factors that are automatically calculated in accordance with an object brightness Bv.

Abstract: A stereoscopic camera is provided with a mechanism to move reflective members into and out of an optical path such that the camera may take stereoscopic photographs in one position of the moving mechanism. The camera may also take normal full-frame photographs in a second position of the moving mechanism.

Abstract: A strobe control device for a camera has a light receiving element for receiving and integrating light reflected from a film surface of a film used in the camera. The strobe control device further includes a controller which controls a strobe to emit light. The controller controls the strobe to stop emitting light when the amount of light integrated by the light receiving element reaches a threshold value. The threshold value is adjusted so that the effects on the amount of light received by the light receiving element are canceled when predetermined parameters of a photographing optical path of the camera are changed.

Abstract: An auto-bracketing system for use with a camera. A plurality of exposure values, representing different exposure conditions, are calculated. The plurality of exposure values are calculated in accordance with at least two brightness values metered by optical sensors associated with the camera. A plurality of film frames, of a film installed in the camera, are subsequently exposed to the different exposure conditions.

Abstract: An exposure control apparatus of a camera having a photometer for detecting a brightness of an object to be taken, an exposure value calculator for calculating an optimum exposure value in accordance with the object brightness, and an exposure factor setting device for setting a pair of exposure factors having a shutter speed and a diaphragm value, including an exposure factor manual setting device, a specific program exposure mode in which the exposure factors corresponding to the optimum exposure values are automatically set, and an exposure factor modifying device for enabling the exposure factor manual setting device to manually set one of the exposure factors when the exposure factor manual setting device is actuated in the specific program exposure mode.

Abstract: A photometry system for a camera has a finder optical system for receiving light reflected by an object and for forming an image of the object on a finder field, the image corresponding to an image that is formed on a film surface. The photometry system also includes an indicator for projecting a predetermined image onto a predetermined area of the finder field: a photometric sensor that detects a brightness of the image formed on the finder field; and a controller which inhibits the indicator from projecting the predetermined image onto the finder field when the photometric sensor is detecting a brightness of a portion of the finder field which includes the predetermined area.

Abstract: An exposure control apparatus of a camera, wherein a pair of exposure factors that include a shutter speed and a diaphragm value can be manually and independently set. Furthermore, in the exposure control apparatus, an exposure value determined in accordance with the exposure factors can be locked, and one of the exposure factors can be varied, based on the locked exposure value, when the other exposure factor is varied by the associated manual setting means.