zemax can help to design many kinds of optical systems. Here are the basic steps: J_fs}Y1q\
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1. make spec for your system ;xiwyfqgE
2. make initial design jD%|@ux
3. choose glass materials 'MBXk2?b
4. analysize the abration and image... _aBy>=2c$
5. modify and optimze them (this is the core of the design). KVr9kcs
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To do these, you need to study basic knowledge of geometric optics.