| 摘要 |
The present invention provides a camera system including a camera body and a catadioptric lens mountable on the camera body, comprises a sensor provided in the camera body, for detecting a focusing condition of a lens mounted on the camera body, by detecting a distance of a pair of secondary images of an image formed by the lens and light shield, provided in the catadioptric lens, for determining both an outside diameter of an exit pupil of the catadioptric lens and an inside diameter thereof so that light bundles forming the pair of secondary images are passed through the exit pupil.
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