第二和第三透镜组中至少一组，可以包括单个透镜。
At least one of the second and third lens groups can include a single lens.
CCD单元（33）接受通过了第三透镜组（G3）的 光束。
The CCD unit (33) receives the light flux passing through the third lens group (G3).
从共轴球面系三对基点的概念出发，给出了前后介质都是空气的薄透镜组和厚透镜的基点位置的简易解法。
The locations of cardinal points of coaxial spherical system is defined by the conception of three pairs of cardinal points of coaxial spherical system in the air co-medium.
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