| 摘要 |
PURPOSE:To simplify an exposure controlling circuit system, and also to execute exact exposure control by constituting so that an EE value is set by an illuminate-examining light, a measured data in the course of photographing is subtracted successively from the EE value immediately before release at the time of photographing, and the exposure is ended when the EE value is reduced to zero. CONSTITUTION:The photometric data of an A/D converter 14 is inputted to a CPU16 through an I/O port 15, and expressed in terms of an exposure value (EE value). In this case, an EV corrected value (EV level) and the level of an illuminate-examining light are inputted from a key unit (KEY) 22, and stored in an RAM18. An exposure constant is calculated by the EV corrected value read out of this RAM18. A distribution light quantity of both lamp light and stroboscopic light is considered in case of the operation of the EE value so that a photometric data of the lamp light corresponds to a photometric data of the stroboscopic light, and the obtained EE value is stored in an RAM17. Subsequently, the exposure time is calculated by the following expression, that is, the exposure time = the exposure constant X the illuminate-examining light level/the photometric data. To which part of a control range this exposure time is contained is checked, and overexposure, correct exposure or underexposure is decided. The result of the decision is inputted to a display panel 23 through a key panel controller 19, and whether photographing can be executed or not is decided by this display. |
