| 摘要 |
PURPOSE:To accurately find the brightness of a subject under a fluorescent lamp by calculating a light measured value by using the mean value of the integration time of plural integrating operations. CONSTITUTION:Incident light beams are made meident on a condenser lens CL through a photographic lens TL and a film equivalent surface F. Then, images of ranges A and B on the film equivalent surface F are re-formed on charge storage type image sensors I1 and I2 as images A1 and B1, and A2 and B2. Then, the image sensors I1 and I2 send out two image signals corresponding to the intensity distributions of the two images formed thereupon to a focus detecting circuit consisting of a microcomputer. Then, a focus detecting circuit finds the light measured value by using the mean value of the integration time of plural integrating operation to accurately find the brightness of the subject in the presence of the fluorescent lamp. |
