以下为句子列表：
英文: A focal length only half the diagonal of the film frame, produced with an almost symmetric lens design of surprising compactness, featuring the typical advantages of symmetrical lens designs: distortion is extremely well controlled, and so is color correc
中文: 只有胶片对角线长度一半的焦距、惊人的紧凑和几乎对称的镜头设计，使之具有对称结构镜头的典型优点：控制得极好的变形、色彩矫正和像场平坦度。
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英文: And even among lenses of equal focal length and aperture, there are differences.
中文: 甚至即使是同样焦长度和光圈的镜头仍有不同。
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英文: If the objective lens is closer to the compact disk than the focal length of the object lens, then the cylindrical lens creates an elliptical image on the photodetector array.
中文: 如果物镜与光盘之间的距离短于物镜的焦距，柱面透镜就会使在光电探测器阵列上的成像变成椭圆影像。
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英文: If the objective lens is further away from the compact disk than the focal length of the object lens, then the cylindrical lens again creates an elliptical image on the photodetector array.
中文: 如果物镜与光盘之间的距离长于物镜的焦距，柱面透镜也会使在光电探测器阵列上的成像变成椭圆影像。
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英文: Of course, if the disk is right at the focal length of the objective lens, then the cylindrical lens does not affect the image and it is perfectly circular.
中文: 当然，如果正好处于物镜焦距位置，柱面镜就不会影响到光电探测器上的成像，因而会获得一个完美的圆性影像。
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