zemax can help to design many kinds of optical systems. Here are the basic steps: 7zE1>.
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1. make spec for your system V62lN<M
2. make initial design jR\! 2!
3. choose glass materials _1$ Y\Y
4. analysize the abration and image... d`$w3Hy
5. modify and optimze them (this is the core of the design). G^SJhdO(Q
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To do these, you need to study basic knowledge of geometric optics.