| 摘要 |
PURPOSE:To perform automatic dimming, by leading a part of the luminous flux, which comes from an object during the exposure of a film, onto a photoelectric converter of a focusing detector and stopping the operation of an illuminating means when a proper exposure is obtained. CONSTITUTION:For example, a single-lens reflex camera main body 25 is provided with a photodetecting unit 31, and the unit 31 receives the incident luminous flux of a lens 24 through a quick return mirror 27a and is used for detection of the focusing state. Further, the unit 31 is constituted so as to receive the reflection light from a film 34 through a small mirror 39 at an exposure time. When the automatic dimming mode is set and a flash 40 emits the light, an electric charge corresponding to the quantity of light emission is integrated in a signal processing circuit 32 in respect to the detection light of the unit 31; and when it reaches a predetermined voltage, light emission of the flash 40 is stopped. Thus, the photodetecting unit for focusing detection is switched and used to perform the automatic dimming for a proper exposure. |
