| 摘要 |
To perform accurate focus detection using a wide range of injected luminous flux from a photographic lens, a deflecting plate, which deflects the injected luminous flux of the photographic optical system in the vertical direction with respect to the direction of a pair of entrance pupils of a focus detecting optical system, is provided at, or near, a predetermined image forming plane of the photographic optical system. By this structure, the entrance pupils of the focus detecting optical system can be spread in a direction vertical to the focus detecting direction, and the focus detecting accuracy can be improved by using a wider range of the injected luminous flux of the focus detecting optical system.
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