| 摘要 |
A photoelectric conversion apparatus for focus detection includes a monitor photoelectric transducer element which produces a voltage corresponding to a charge storage produced by photoelectric transducer elements in accordance with a distribution of light brightness of an object being photographed. An output voltage from the monitor transducer element is compared against a reference voltage at a given time interval after the initiation of the charge storage. If a result of the comparison indicates that an output voltage from the monitor transducer element reaches the reference voltage, the output from the photoelectric transducer elements is directly used in the focus detection. When the output of the monitor transducer element does not reach the reference voltage, the output from the photoelectric transducer element is fed to an amplifier after the time interval, and an output from the amplifier is used in the focus detection.
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