以下为句子列表：
英文: Close-up performance of the Summicron-M is on the same level as the performance at infinity setting (actually infinity is that distance where the incoming light rays are parallel to the optical axis.
中文: 近摄表现与无穷远时相当(事实上,无穷远处的光线是平行光轴入射的.对多数镜头而言,大约100倍焦距的物距时,入射光满足这一条件).
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英文: In this article, the center conditions, isochronous center conditions and bifurcation of limit cycles at infinity for a class of fifth system are investigated.
中文: 摘要研究一类五次系统无穷远点的中心、拟等时中心条件与极限环分支问题。
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英文: The camera is focused at infinity .
中文: 照相机的聚焦被调节在无限远这一档上。
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英文: Wide open or fully stopped down at infinity focus the lens is ever so slightly soft compared to the professional telephoto zooms.
中文: 用大光圈向无限远拍摄到的影像要比用专业的长镜头一样是大光圈向无限远所拍摄得的影像来得软.
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