Abstract: A manual-wind camera having a wind lever in which a film having no sprocket holes is loaded, the film being wound on a take-up spool, frame by frame, by manually operating the wind lever, includes a pulse generator which generates pulses in accordance with movement of the film wound by the wind lever; a rear-cover state detector which detects whether a rear cover of the camera is open or closed; and a control device. The control device determines whether the film is loaded into the camera in accordance with pulses generated by the control device when the wind lever is fully turned from an initial operational position to a maximum operational position thereof.

Abstract: A manual-wind camera is provided having a wind lever in which a film having no sprocket holes is loaded, the film being wound on a take-up spool, frame by frame, by manually operating the wind lever. The camera includes a pulse generator which generates pulses in accordance with movement of the film wound by the wind lever, and a counter which detects and counts the pulses generated by the pulse generator, the pulse generator and the counter are connected to a control device. The control device detects a film winding speed of the film in accordance with the number of the pulses counted by the counter, wherein the control device adjusts a reference pulse number, which corresponds to a predetermined appropriate winding amount of the film, in accordance with a the film winding speed detected by the control device. An engagement of the wind lever with the take-up spool is released at the moment the adjusted reference pulse number becomes equal to the number of the pulses counted by the counter.

Abstract: A single-lens reflex camera comprises a quick return mirror which can be positioned at an object observing position (or an inclined position) and a photographing position (or a horizontal position). A photoreceptor element is disposed in such a manner that a light receiving surface of the photoreceptor element faces a shutter, so that a light beam reflected by the shutter is led to the photoreceptor element. When the quick return mirror is retreated to the photographing position, the light beam is received by the photoreceptor element. When a change in the amount of received light by the photoreceptor element exceeds a predetermined range while the mirror is retreated to the photographing position before the shutter release operation, a warning is output.

Abstract: A camera having a manual film winding apparatus in which a film is wound in association with a rotation of a winding operation device from a wind start position to a wind end position includes: an encoder which rotates in association with the movement of the film which is wound by the rotation of the winding operation device and generates a signal each time the winding operation device is rotated by a predetermined angle; a film feed amount detection device which counts output of the encoder to detect the feed amount of the film; a rotation detection device for detecting the rotation of the winding operation device; and a controller which interrupts the encoder by turning the encoder OFF after the lapse of a predetermined time when the winding operation device is stopped during the winding operation, wherein the controller turns the encoder ON when the rotation detection device detects rotation of the winding operation device thereafter, so that the film feed amount detection device continues the counting ope

Abstract: A multipoint autofocus system includes a line sensor which receives object images and outputs a signal corresponding to a brightness thereof. The system also includes a controller having an A/D converter which converts the signal output from the line sensor to 10 bit digital data, and further converts the 10 bit digital data to one of 9 bit and 8 bit digital data, wherein a conversion precision of the A/D converter can be varied.

Abstract: A multipoint autofocus system is provided with a judging apparatus and controller. The multipoint autofocus system detects a focus state of objects at different positions in a plurality of focus detection zones of an image surface. Thereafter, information on the detected focus state is selected, so that a focusing optical system is moved in accordance with the selected focus data. The judging apparatus judges the contrast of the detected object in the focus detection zones. The controller selects data representing the shortest focus from among the focus data of the objects in the focus detection zones in which the judged object contrast is higher than a predetermined value.

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 camera having an automatic focusing system includes a focus detector in a camera body to which a photographing lens can be detachably mounted for detecting a focus state for an object image formed by the photographing lens mounted to the camera body. A lens driver in the camera body drives a focusing lens group of the photographing lens to a focal position in accordance with the deflected focus state. A controller in the camera body drives the focusing lens group at a moving-object prediction mode, taking into account a movement of an image surface of the object when the object is a moving object. A memory in the photographing lens stores lens data used to either permit or prohibit an operation at the moving-object prediction mode. The controller determines whether to permit or prohibit the operation at the moving-object prediction mode in accordance with the lens data rear from the memory of the photographing lens.

Abstract: A multipoint autofocusing system has a plurality of light receiving devices each having a plurality of focus detection areas which receive light of object images and perform an integral operation in which the object light is converted to produce integrated electric charges. A detecting device is provided for detecting an integration time of each of the light receiving devices based upon commencement of the integral operation. An integration control device is provided for controlling the integration times to stop the integral operation of one of the light receiving devices when the integration time of the light receiving device reaches a predetermined integral value. The integration time of the light receiving device that first reaches the predetermined integral value is t1, and the integration time of the remaining light receiving devices that have not reached the predetermined integral value is t.

Abstract: A camera system includes a camera body and a photographing lens which is detachably attached to the camera body. The photographing lens has an input and output device which inputs and outputs data to and from the camera body, a timing controller which outputs clock pulses for driving the input and output device, and a loading device which loads specific initial value lens data in the input and output device in accordance with the clock pulses. The camera body includes an information processing device which receives the specific initial value lens data loaded in the input and output device.

Abstract: An engine oil composition having a base oil, an ashless dispersant, a metal-containing detergent, zinc dithiophosphate and a sulfur-containing phenol derivative. Examples of sulfur-containing phenol derivative include 2,4-bis{(octylthio)methyl}-o-cresol, 2,2-thiodiethylenebis{3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate}, and tridecyl 2-(3,5-di-ti-butyl-4-hydroxybenzylthio)acetate.

Abstract: A camera system includes a camera body and a photographing lens which is detachably attached to the camera body. The photographing lens has an input and output device which inputs and outputs data to and from the camera body, a timing controller which outputs clock pulses for driving the input and output device, and a loading device which loads specific initial value lens data in the input and output device in accordance with the clock pulses. The camera body includes an information processing device which receives the specific initial value lens data loaded in the input and output device.

Abstract: A camera system includes a camera body and a photographing lens which is detachably attached to the camera body. The photographing lens has an input and output device which inputs and outputs data to and from the camera body, a timing controller which outputs clock pulses for driving the input and output device, and a loading device which loads specific initial value lens data in the input and output device in accordance with the clock pulses. The camera body includes an information processing device which receives the specific initial value lens data loaded in the input and output device.

Abstract: An automatic focusing camera including a camera body and a photographing lens detachably mounted to the camera body. The camera body includes a focus detecting device which outputs a focus signal in accordance with an image formed by a photographing lens, an auxiliary light emitter for emitting auxiliary light for detecting the focus, and an arithmetic operating device for calculating data on focus in accordance with the focus signal output from the focus detecting device, The photographing lens includes a memory for storing predetermined lens data, and an outputting device for outputting the lens data to the camera body. The memory stores correction data on the focusing condition when the auxiliary light is emitted from the auxiliary light emitter. The arithmetic operating device calculates the data on the focusing condition in accordance with the detection data of the focus detecting device and the correction data input from the photographing lens.

Abstract: A photographing lens which can be detachably attached to a camera body includes a memory for storing steady lens data which is constant, regardless of photographing conditions, and variable lens data which vary in accordance with the photographing conditions. A data reader reads the steady lens data and the variable lens data corresponding to the photographing conditions and then outputs the data read from the memory.

Abstract: A photographing lens includes a memory which stores lens data corresponding to a plurality of photographing conditions. An input and output device transmits and receives data to and from an external device. A photographing condition detector detects the photographing conditions of the photographing lens, while a data reader reads the lens data corresponding to the photographing condition data detected by the photographing condition detector or photographing condition data inputted through the input and output device from the memory to output the read data through the input and output device.

Abstract: A camera system includes a camera body and a photographing lens detachably attached to the camera body. The camera body includes a first controller for controlling the operation of the camera system. The photographing lens includes a second controller for controlling the operation thereof. The second controller of the photographing lens is brought into a sleep state when the first controller of the camera body outputs a first predetermined signal.

Abstract: A camera system including a camera body and a photographing lens detachably mounted to the camera body including a memory for storing function data on the aberration correction peculiar to the taking lens, an arithmetic operating device for calculating necessary aberration correction data in accordance with the aberration correction function data stored in the memory, and an output device for outputting the calculated aberration correction data to the camera body.

Abstract: A camera system includes a camera body, and an interchangeable lens that is detachably mounted to the camera body. The interchangeable lens includes an input/output circuit for performing input/output information relative to the camera body and a timing circuit outputs a clock signal. The camera body includes an information processing circuit for performing data communication relative to the input/output circuit on the basis of the clock signal outputted from said timing circuit.

Abstract: An electronic flash control device makes sure that the emission of light of an electronic flash is not impaired by a noise component signal prior to generation of a suitable quantity of light by the flash. A trigger signal is applied by the control device to allow the flash to emit light. An enable signal is supplied to a quenching circuit a predetermined time after the noise of the trigger signal has been produced. When the quantity of light from an object to be photographed by the camera reaches a certain value and the enable signal occurs, the quench circuit suppresses the emission of light by the electronic flash.