zemax can help to design many kinds of optical systems. Here are the basic steps: o<`Mvw@Z
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1. make spec for your system oW3j|V
2. make initial design X]d;x/2
3. choose glass materials f^b.~jXSR}
4. analysize the abration and image... ABw:SQ6=Q
5. modify and optimze them (this is the core of the design). @9lV~,,U
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To do these, you need to study basic knowledge of geometric optics.