摘要:
The disclosure is directed to an improved light measuring device which is used in flash photography for measuring a preliminary flash light to obtain camera exposure informations for photography under a primary flash light. The device is so arranged as to preliminarily obtain information of light amount contributing to photographing, with respect to each portion or area of a scene to be photographed or object field, in taking photographs with the employment of the auxiliary light.
摘要:
In an electronic flash device for use in a still camera, a calculation circuit means calculates a ratio of the amounts of light to be emitted by a plurality of flash light tubes on the basis of color temperature information and control circuit means controls the emission of light of the respective flash light tubes in such a manner that the ratio of light amount emitted from the respective flash light tubes corresponds to the ratio calculated by the calculation circuit means.
摘要:
The disclosure is directed to an improved light measuring device which is used in flash photography for measuring a preliminary flash light to obtain camera exposure information for photography under a primary flash light. The device is so arranged as to preliminarily obtain informations of light amount contributing to photographing, with respect to each portion or area of a scene to be photographed or object field, in taking photographs with the employment of the auxiliary light.
摘要:
An exposure control system includes a device for measuring an intensity of the ambient light, three controllers for controlling three factors of exposure time, aperture size and amount of flash light to be emitted, and a device for setting three pieces of information of film sensitivity and any two of the above mentioned three factors to govern the corresponding two of the three controllers. A calculator is provided for calculating the remaining factor. The calculated value is used for governing the remaining controller. Of the three pieces of information set in the setting device, two pieces can be introduced in a form of a ratio.
摘要:
A light measuring device for use in photography and a method therefor is disclosed, in which the quantity of light during a time interval when the flash light is present is measured and also the quantity of light under the ambient light only is measured for obtaining various exposure information for photography using the flash light.
摘要:
An exposure time controlling system includes a circuit for producing an APEX shutter speed signal which is applied to a first discriminator for briefly classifying the APEX shutter speed signal into four classes and also to a second discriminator for sub-classifying the APEX shutter speed signal. A pulse generator is provided for producing pulse signal having a frequency determined by the class and a counter is provided for counting the pulses for a number of times determined by the sub-class. A shutter mechanism is opened when the counter starts to count and is closed when the counter finishes counting the pulses.
摘要:
An improved light measuring device that is capable of measuring light upon initialization from either a flash of light or a manual switch is provided. A sensor assembly can produce a light intensity signal and a change in the intensity of the light measured can be used to produce a first signal. A second signal can be produced by a manually operable member. A counter can be used to count the number of signals and to produce a preparing signal upon an initial signal counted and a start signal upon a subsequent signal counted. Measurement of the amount of light in the circuit can be initially enabled when the counting means counts the first signal and the actual light measurement can be started subsequently upon the counting means initiating a start signal. Various sequences of producing the pair of signals can be utilized to control the operation of the light measuring device.
摘要:
An electronic flash device fires one or a pair of flash tubes sequentially for continuous shooting photography with a motor driven photographic camera, for substantially continuous illumination or for sequential illuminations at intervals, as well as fire the flash tube a single time for one shot photography. The flash device is provided with a main capacitor and an auxiliary capacitor which selectively energize the flash tube or tubes. The auxiliary capacitor is charged by the main capacitor and discharged to energize the flash tube for a small amount of flash light and shorttime restoration of the flash firing circuit. When a pair of flash tubes are employed, they are alternatively actuated for the sequential firing and one of them is actuated for the single time firing. The pair of flash tubes are coupled with each other through a commutation capacitor and switch elements for quick repetition of their firings.
摘要:
In a photographic light measuring device, a light output signal representing light reflected from an object to be photographed is converted into digital signals. At least first and second setting means generate respective first and second digital set signals which are respectively variable in response to respective manual operations. Photographic exposure data signals are generated using the digital light signal and the first and second set digital signals such that indicating means can selectively indicate data commensurate with the first and second digital set signals.
摘要:
A color meter for measuring the respective intensity of the blue, green and red regions of an illuminating light source to provide the photographic information according to the measured value. The present invention provides an appliance, which directly provides, as the final output, the light balancing factor or the color compensating factor according to the necessary one from among the measured informations of the light intensity of each region of blue, green, red and an information determined according to using film, video image pickup tube, solid image pickup element, etc. and of which the operation is simple and the correcting filter can be simply and quickly determined.