zemax can help to design many kinds of optical systems. Here are the basic steps: Gl>_C@n0h
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1. make spec for your system _"%-=^_
2. make initial design vwQ6=
3. choose glass materials q--;5"=S
4. analysize the abration and image... u~^d5["T
5. modify and optimze them (this is the core of the design). ~~'UQnUN4
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To do these, you need to study basic knowledge of geometric optics.