zemax can help to design many kinds of optical systems. Here are the basic steps: r=Lgh#9S
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1. make spec for your system \2a;z<(
2. make initial design GK'p$`oJm
3. choose glass materials _Wg}#r
4. analysize the abration and image... 0g|5s
5. modify and optimze them (this is the core of the design). ^-k"gLg
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To do these, you need to study basic knowledge of geometric optics.