Abstract: A photometering apparatus for measuring the brightness of an object to be photographed, includes a condenser lens having at least one aspheric lens surface for condensing a bundle of rays reflected from the object. A diaphragm is provided at a predetermined distance behind the condenser lens with respect to the object, and a split type light receiving device is provided behind the diaphragm to receive light which passes through the diaphragm. These elements satisfy the condition represented by the formula 0.3.ltoreq.L.sub.ASP /T.sub.L .ltoreq.0.7, wherein "T" represents the distance between the surface of the condenser lens nearer to the object to be photographed and the light receiving device, and wherein "L.sub.ASP " represents the reduced distance between the aspheric surface of the condenser lens and the diaphragm. The term "L.sub.ASP " is defined by the relationship L.sub.ASP =(d.sub.L /N)+d.sub.s, wherein "d.sub.L " represents the thickness of the lens, "d.sub.

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 focus detecting apparatus is provided including an image reforming optical system which splits a bundle of rays incident upon a detecting zone, which is provided on a predetermined focal surface, and reforms an image. The predetermined focal surface is substantially conjugate with a focal plane of a taking lens. The focus detecting apparatus further includes a line sensor which receives the reformed image, a detector which detects a focus state of the taking lens in accordance with an output of the line sensor, and a driver which moves the detecting zone on the predetermined focal surface.

Abstract: A focus detecting apparatus, includes multiple detecting zones situated in a focal plane, an orientation changing mechanism which changes the orientations of images formed in these zones, an image separating device which separate these images into image pairs, and multiple sensors. The multiple sensors have a different positional relationship than that of the multiple detecting zones which detect the image pairs.

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.

Abstract: A zoom lens system is disclosed which is fairly compact and easy to handle despite the fact that it has a constant overall lens length and which allows the first lens group to be moved by a sufficiently small amount during zooming to facilitate the adoption of automatic housing. The zoom lens system includes, in order from the object side, a first lens group having a positive power, a second lens group having a negative power and a third lens group having a positive power, the first lens group being fixed during zooming, the second and third lens groups being moved along the optical axis as zooming is effected, the system satisfying the following conditions (a) and (b):0.8<fW/.function.1<1.25 (a)m2 L<-1<m2 S (b)wherefW: the focal length of the overall system at the wide-angle end;.function.1: the focal length of the first lens group;m2L: the magnification by the second lens group at the telephoto end; andm2S: the magnification by the second lens group at the wide-angle end.

Abstract: A focus detecting apparatus, in which a pair of bundles of rays, transmitted through different portions of an exit pupil of a taking lens, are transmitted through a common focus detecting zone formed on an imaginary focal plane of the taking lens. The focus detecting apparatus includes two image reforming optical systems which reform images of the bundles of rays, incident on the focus detecting zone in different directions and transmitted therethrough, in accordance with a change in position of the exit pupil in the optical axis direction of the taking lens. A pair of line sensors are located at predetermined positions, upon which the images of the respective bundles of rays are reformed through the respective image reforming optical systems.

Abstract: A focus detecting apparatus, characterized in that it comprises, multiple detecting zones situated in a focal plane, an orientation changing mechanism which changes the orientations of images formed in these zones, an image separating device which separate these images into image pairs, and multiple sensors, having a different positional relationship to that of the multiple detecting zones, which detect the image pairs.

Abstract: An eye direction detecting device includes a light emitting optical system, which emits detecting light through a first optical path to be made incident upon an eye. A polarization beam splitter provided in the first optical path of the detecting light generates a second optical path. A light receiving optical system is provided in the second optical path, and a 1/4 wave plate is provided between the polarization beam splitter and the eye, so that light emitted from the light source can be effectively received by a light receiving element.

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: A focus detecting apparatus in which a pair of bundles of rays, transmitted through different portions of an exit pupil of a taking lens, are transmitted through a common focus detecting zone on a predetermined focal plane of the taking lens and converged onto corresponding line sensors through a condenser lens and separator lenses to re-image the image formed on the predetermined focal plane of the taking lens into two separate images. A light deflector is provided between the taking lens and the separator lenses to deflect an optical path of the bundles of rays to make the bundles of rays incident upon the separator lenses and the corresponding line sensors.

Abstract: A focus detecting apparatus in which a pair of bundles of rays transmitted through different portions of an exit pupil of a taking lens are transmitted through a common focus detecting zone on a predetermined focal plane of the taking lens and are then converged onto corresponding line sensors through a condenser lens. Separator lenses reform images separated from an image formed on the predetermined focal plane of the taking lens. The focus detecting zone deviates from the optical axis of the taking lens, and the condenser lens has an asymmetrical power distribution.