| 摘要 |
A focus detecting method and its apparatus arranges two rows of photoelectric transducer elements in positions optically equivalent to plane position which are located before and behind a presumed focal plane of an image forming optical system, respectively, divide a light beam into a first light beam passing through a first half portion of an exit pupil and a second light beam passing through a second half portion of the exit pupil by a shift generating optical system, primarily receive one of said first and second light beams on at least one of said first and second rows of transducer elements and primarily receive the other of said first and second light beams on at least the other of said first and second rows and performs a focus detection based on shift or displacement of images which is caused by said first and the second light beams on said first and second rows of transducer elements.
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