| 摘要 |
A zoom lens system has a first lens unit located closest to an object side and moves in an optical axis direction during both zooming and focusing and a light shielding plate which moves in a same direction and by same amount as the first lens unit during zooming, while the light shielding plate being stationary during focusing. As a result, adequate light is secured for peripheral areas when the lens system is in focus on a close-range object and the occurrence of flaring is prevented when the lens system is in focus on an object located at infinity.
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