之后，通过合理控制前固定组球差及后固定组焦距，使变焦过程中的像面保持稳定。

Then, image surface position was kept steady during a zooming process by controlling the spherical aberration of front fixed group and the focal length of back fixed group.

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之后，通过合理控制前固定组球差及后固定组焦距，使变焦过程中的像面保持稳定。

Then, image surface position was kept steady during a zooming process by controlling the spherical aberration of front fixed group and the focal length of back fixed group.

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