| 摘要 |
A focus detection system for a camera, especially for a single lens reflex camera, is disclosed. The focus detection system comprises a light projection means for illuminating an object at the active AF and means for switching positions and/or sizes of iris apertures for focus detection according to the type, F-number, focal length, shift amount etc., of an interchangeable lens assembly in order to remove possible light beams such as flares and ghosts generated by surface reflections due to lenses comprising the interchangeable objective lens.
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