zemax can help to design many kinds of optical systems. Here are the basic steps:
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1. make spec for your system 1B]wSvP@
2. make initial design ](6vG$\
3. choose glass materials ghd[G}
4. analysize the abration and image... g<0%-p
5. modify and optimze them (this is the core of the design). (=/L#Yg_
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To do these, you need to study basic knowledge of geometric optics.