试着做了个三片型的照相物镜，根据郁道银老师编写的《光学工程》进行理论计算，焦点的位置在91.7407.模型建立后用ASAP进行仿真，采用FOCUS命令得出焦点最佳位置为99.65395，仿真结果和理论结果差别有点大，不知道什么原因，大家共同分析下，找下原因所在。代码如下：
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FOCUS
