zemax can help to design many kinds of optical systems. Here are the basic steps: RWE~&w G}
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1. make spec for your system 6GOg_P
2. make initial design AP@<r
3. choose glass materials ~L){O*Z
4. analysize the abration and image... >ITEd
5. modify and optimze them (this is the core of the design). 5+FLSk
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To do these, you need to study basic knowledge of geometric optics.